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GitHub - alibaba/coobjc: coobjc provides coroutine support for Objective-C and Swift. We added await method、generator and actor model like C#、Javascript and Kotlin. For convenience, we added coroutine categories for some Foundation and UIKit API in cokit framework like NSFileManager, JSON, NSData, UIImage etc. We also add tuple support in coobjc.
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We added await method、generator and actor model like C#、Javascript and Kotlin. For convenience, we added coroutine categories for some Foundation and UIKit API in cokit framework like NSFileManager, JSON, NSData, UIImage etc. We also add tuple support in coobjc.</title> <meta name="route-pattern" content="/:user_id/:repository" data-turbo-transient> <meta name="route-controller" content="files" data-turbo-transient> <meta name="route-action" content="disambiguate" data-turbo-transient> <meta name="current-catalog-service-hash" content="f3abb0cc802f3d7b95fc8762b94bdcb13bf39634c40c357301c4aa1d67a256fb"> <meta name="request-id" content="C7B8:3695EA:85FC79:9BC717:67E3D7E3" data-pjax-transient="true"/><meta name="html-safe-nonce" content="c68b7ef4c5f212ff497bb9b7b94e6b3df3055ff092233d57d0033cb7b4289c99" data-pjax-transient="true"/><meta name="visitor-payload" content="eyJyZWZlcnJlciI6IiIsInJlcXVlc3RfaWQiOiJDN0I4OjM2OTVFQTo4NUZDNzk6OUJDNzE3OjY3RTNEN0UzIiwidmlzaXRvcl9pZCI6Ijg2Njc0MjYzMTM1NDc3OTg0OTkiLCJyZWdpb25fZWRnZSI6InNvdXRoZWFzdGFzaWEiLCJyZWdpb25fcmVuZGVyIjoic291dGhlYXN0YXNpYSJ9" data-pjax-transient="true"/><meta name="visitor-hmac" content="1b44aaf1fce3a0f886698ec56317fbeccf37fb4e481d00f50c8a42cf96f2850f" data-pjax-transient="true"/> <meta name="hovercard-subject-tag" content="repository:172702973" data-turbo-transient> <meta name="github-keyboard-shortcuts" content="repository,copilot" data-turbo-transient="true" /> <meta name="selected-link" value="repo_source" data-turbo-transient> <link rel="assets" href="https://github.githubassets.com/"> <meta name="google-site-verification" content="Apib7-x98H0j5cPqHWwSMm6dNU4GmODRoqxLiDzdx9I"> <meta name="octolytics-url" content="https://collector.github.com/github/collect" /> <meta name="analytics-location" content="/<user-name>/<repo-name>" data-turbo-transient="true" /> <meta name="user-login" content=""> <meta name="viewport" content="width=device-width"> <meta name="description" content="coobjc provides coroutine support for Objective-C and Swift. 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12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 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Link--secondary" data-analytics-event="{"location":"navbar","action":"view_all_industries","context":"solutions","tag":"link","label":"view_all_industries_link_solutions_navbar"}" href="/solutions/industry"> View all industries </a></li> </ul> </div> </div> <div class="HeaderMenu-trailing-link rounded-bottom-2 flex-shrink-0 mt-lg-4 px-lg-4 py-4 py-lg-3 f5 text-semibold"> <a href="/solutions"> View all solutions <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-right HeaderMenu-trailing-link-icon"> <path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path> </svg> </a> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Resources <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="resources-topics-heading">Topics</span> <ul 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data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"executive_insights","context":"resources","tag":"link","label":"executive_insights_link_resources_navbar"}" href="https://github.com/solutions/executive-insights"> Executive Insights </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Open Source <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> Fund open source developers </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"the_readme_project","context":"open_source","tag":"link","label":"the_readme_project_link_open_source_navbar"}" href="https://github.com/readme"> <div> <div class="color-fg-default h4">The ReadME Project</div> GitHub community articles </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="open-source-repositories-heading">Repositories</span> <ul class="list-style-none f5" aria-labelledby="open-source-repositories-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"topics","context":"open_source","tag":"link","label":"topics_link_open_source_navbar"}" href="https://github.com/topics"> Topics </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"trending","context":"open_source","tag":"link","label":"trending_link_open_source_navbar"}" href="https://github.com/trending"> Trending </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" 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id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="code-search-feedback-form" data-action="click:qbsearch-input#submitFeedback" type="submit" data-view-component="true" class="btn-primary btn"> Submit feedback </button> </div> </dialog></dialog-helper> <custom-scopes data-target="qbsearch-input.customScopesManager"> <dialog-helper> <dialog data-target="custom-scopes.customScopesModalDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="custom-scopes-dialog" 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6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="E6yx8m0fMzIdxREyJMga85iWWTA21DOaZzIBtfQXEIOulp47mowF3S2Pf1A/Xv2IV+Z5atXlePCwt8lVRZdGAg==" /> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <input type="hidden" 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<h1 class='sr-only'>alibaba/coobjc</h1> <div class="clearfix container-xl px-md-4 px-lg-5 px-3"> <div> <div style="max-width: 100%" data-view-component="true" class="Layout Layout--flowRow-until-md react-repos-overview-margin Layout--sidebarPosition-end Layout--sidebarPosition-flowRow-end"> <div data-view-component="true" class="Layout-main"> <script crossorigin="anonymous" defer="defer" type="application/javascript" src="https://github.githubassets.com/assets/vendors-node_modules_dompurify_dist_purify_es_mjs-dd1d3ea6a436.js"></script> <script crossorigin="anonymous" defer="defer" type="application/javascript" src="https://github.githubassets.com/assets/vendors-node_modules_tanstack_query-core_build_modern_queryObserver_js-node_modules_tanstack_-defd52-843b41414e0e.js"></script> <script crossorigin="anonymous" defer="defer" type="application/javascript" 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href=\"/alibaba/coobjc/blob/master/coobjc_icon.png\"\u003e\u003cimg src=\"/alibaba/coobjc/raw/master/coobjc_icon.png\" alt=\"coobjc\" title=\"coobjc\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis library provides coroutine support for Objective-C and Swift. We added await method、generator and actor model like C#、Javascript and Kotlin. For convenience, we added coroutine categories for some Foundation and UIKit API in \u003ca href=\"/alibaba/coobjc/blob/master/cokit/README.md\"\u003ecokit framework\u003c/a\u003e like NSFileManager, JSON, NSData, UIImage etc. We also add tuple support in coobjc.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"/alibaba/coobjc/blob/master/README_cn.md\"\u003ecooobjc 中文文档\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x0 iOS Asynchronous programming problem\u003c/h2\u003e\u003ca id=\"user-content-0x0-ios-asynchronous-programming-problem\" class=\"anchor\" aria-label=\"Permalink: 0x0 iOS Asynchronous programming problem\" href=\"#0x0-ios-asynchronous-programming-problem\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBlock-based asynchronous programming callback is currently the most widely used asynchronous programming method for iOS. The GCD library provided by iOS system makes asynchronous development very simple and convenient, but there are many disadvantages based on this programming method：\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eget into Callback hell\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSequence of simple operations is unnaturally composed in the nested blocks. This \"Callback hell\" makes it difficult to keep track of code that is running, and the stack of closures leads to many second order effects.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eHandling errors becomes difficult and very verbose\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eConditional execution is hard and error-prone\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eforget to call the completion block\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eBecause completion handlers are awkward, too many APIs are defined synchronously\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis is hard to quantify, but the authors believe that the awkwardness of defining and using asynchronous APIs (using completion handlers) has led to many APIs being defined with apparently synchronous behavior, even when they can block. This can lead to problematic performance and responsiveness problems in UI applications - e.g. spinning cursor. It can also lead to the definition of APIs that cannot be used when asynchrony is critical to achieve scale, e.g. on the server.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eMulti-threaded crashes that are difficult to locate\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eLocks and semaphore abuse caused by blocking\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x1 Solution\u003c/h2\u003e\u003ca id=\"user-content-0x1-solution\" class=\"anchor\" aria-label=\"Permalink: 0x1 Solution\" href=\"#0x1-solution\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThese problem have been faced in many systems and many languages, and the abstraction of coroutines is a standard way to address them. Without delving too much into theory, coroutines are an extension of basic functions that allow a function to return a value or be suspended. They can be used to implement generators, asynchronous models, and other capabilities - there is a large body of work on the theory, implementation, and optimization of them.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eKotlin is a static programming language supported by JetBrains that supports modern multi-platform applications. It has been quite hot in the developer community for the past two years. In the Kotlin language, async/await based on coroutine, generator/yield and other asynchronous technologies have become syntactic standard, Kotlin coroutine related introduction, you can refer to：\u003ca href=\"https://www.kotlincn.net/docs/reference/coroutines/basics.html\" rel=\"nofollow\"\u003ehttps://www.kotlincn.net/docs/reference/coroutines/basics.html\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x2 Coroutine\u003c/h2\u003e\u003ca id=\"user-content-0x2-coroutine\" class=\"anchor\" aria-label=\"Permalink: 0x2 Coroutine\" href=\"#0x2-coroutine\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCoroutines are computer program components that generalize subroutines for non-preemptive multitasking, by allowing execution to be suspended and resumed. Coroutines are well-suited for implementing familiar program components such as cooperative tasks, exceptions, event loops, iterators, infinite lists and pipes\u003c/strong\u003e\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThe concept of coroutine has been proposed in the 1960s. It is widely used in the server. It is extremely suitable for use in high concurrency scenarios. It can greatly reduce the number of threads in a single machine and improve the connection and processing capabilities of a single machine. In the meantime, iOS currently does not support the use of coroutines（That's why we want to support it.）\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x3 coobjc framework\u003c/h2\u003e\u003ca id=\"user-content-0x3-coobjc-framework\" class=\"anchor\" aria-label=\"Permalink: 0x3 coobjc framework\" href=\"#0x3-coobjc-framework\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ecoobjc is a coroutine development framework that can be used on the iOS by the Alibaba Taobao-Mobile architecture team. Currently it supports the use of Objective-C and Swift. We use the assembly and C language for development, and the upper layer provides the interface between Objective-C and Swift. Currently, It's open source here under Apache open source license.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x31 Install\u003c/h3\u003e\u003ca id=\"user-content-0x31-install\" class=\"anchor\" aria-label=\"Permalink: 0x31 Install\" href=\"#0x31-install\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ecocoapods for objective-c: pod 'coobjc'\u003c/li\u003e\n\u003cli\u003ecocoapods for swift: pod 'coswift'\u003c/li\u003e\n\u003cli\u003ecocoapods for cokit: pod 'cokit'\u003c/li\u003e\n\u003cli\u003esource code: All the code is in the ./coobjc directory\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x32 Documents\u003c/h3\u003e\u003ca id=\"user-content-0x32-documents\" class=\"anchor\" aria-label=\"Permalink: 0x32 Documents\" href=\"#0x32-documents\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eRead the \u003ca href=\"/alibaba/coobjc/blob/master/docs/arch_design.md\"\u003eCoroutine framework design\u003c/a\u003e document.\u003c/li\u003e\n\u003cli\u003eRead the \u003ca href=\"/alibaba/coobjc/blob/master/docs/usage.md\"\u003ecoobjc Objective-C Guide\u003c/a\u003e document.\u003c/li\u003e\n\u003cli\u003eRead the \u003ca href=\"/alibaba/coobjc/blob/master/docs/usage_swift.md\"\u003ecoobjc Swift Guide\u003c/a\u003e document.\u003c/li\u003e\n\u003cli\u003eRead the \u003ca href=\"/alibaba/coobjc/blob/master/cokit/README.md\"\u003ecokit framework\u003c/a\u003e document, learn how to use the wrapper api of System Interface.\u003c/li\u003e\n\u003cli\u003eWe have provided \u003ca href=\"/alibaba/coobjc/blob/master/Examples/coobjcBaseExample\"\u003ecoobjcBaseExample\u003c/a\u003e demos for coobjc, \u003ca href=\"/alibaba/coobjc/blob/master/Examples/coSwiftDemo\"\u003ecoSwiftDemo\u003c/a\u003e for coswift, \u003ca href=\"/alibaba/coobjc/blob/master/cokit/Examples/coKitExamples\"\u003ecoKitExamples\u003c/a\u003e for cokit\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x33 Features\u003c/h3\u003e\u003ca id=\"user-content-0x33-features\" class=\"anchor\" aria-label=\"Permalink: 0x33 Features\" href=\"#0x33-features\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003easync/await\u003c/h4\u003e\u003ca id=\"user-content-asyncawait\" class=\"anchor\" aria-label=\"Permalink: async/await\" href=\"#asyncawait\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ecreate coroutine\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eCreate a coroutine using the co_launch method\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"co_launch(^{\n ...\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-en\"\u003eco_launch\u003c/span\u003e(^{\n ...\n});\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe coroutine created by co_launch is scheduled by default in the current thread.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eawait asynchronous method\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eIn the coroutine we use the await method to wait for the asynchronous method to execute, get the asynchronous execution result\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"- (void)viewDidLoad {\n ...\n co_launch(^{\n // async downloadDataFromUrl\n NSData *data = await(downloadDataFromUrl(url));\n \n // async transform data to image\n UIImage *image = await(imageFromData(data));\n\n // set image to imageView\n self.imageView.image = image;\n });\n}\"\u003e\u003cpre\u003e- (\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e)viewDidLoad {\n ...\n \u003cspan class=\"pl-c1\"\u003eco_launch\u003c/span\u003e(^{\n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003e async downloadDataFromUrl\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eNSData\u003c/span\u003e *data = \u003cspan class=\"pl-c1\"\u003eawait\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003edownloadDataFromUrl\u003c/span\u003e(url));\n \n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003e async transform data to image\u003c/span\u003e\n UIImage *image = \u003cspan class=\"pl-c1\"\u003eawait\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eimageFromData\u003c/span\u003e(data));\n\n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003e set image to imageView\u003c/span\u003e\n self.\u003cspan class=\"pl-smi\"\u003eimageView\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003eimage\u003c/span\u003e = image;\n });\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe above code turns the code that originally needs dispatch_async twice into sequential execution, and the code is more concise.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eerror handling\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eIn the coroutine, all our methods are directly returning the value, and no error is returned. Our error in the execution process is obtained by co_getError(). For example, we have the following interface to obtain data from the network. When the promise will reject: error\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"- (COPromise*)co_GET:(NSString*)url parameters:(NSDictionary*)parameters{\n COPromise *promise = [COPromise promise];\n [self GET:url parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {\n [promise fulfill:responseObject];\n } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {\n [promise reject:error];\n }];\n return promise;\n}\"\u003e\u003cpre\u003e- (COPromise*)co_GET:(\u003cspan class=\"pl-c1\"\u003eNSString\u003c/span\u003e*)url parameters:(\u003cspan class=\"pl-c1\"\u003eNSDictionary\u003c/span\u003e*)parameters{\n COPromise *promise = [COPromise \u003cspan class=\"pl-c1\"\u003epromise\u003c/span\u003e];\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eGET:\u003c/span\u003eurl \u003cspan class=\"pl-c1\"\u003eparameters:\u003c/span\u003eparameters \u003cspan class=\"pl-c1\"\u003eprogress:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003esuccess:\u003c/span\u003e^(\u003cspan class=\"pl-c1\"\u003eNSURLSessionDataTask\u003c/span\u003e * _Nonnull task, \u003cspan class=\"pl-c1\"\u003eid\u003c/span\u003e _Nullable responseObject) {\n [promise \u003cspan class=\"pl-c1\"\u003efulfill:\u003c/span\u003eresponseObject];\n } \u003cspan class=\"pl-c1\"\u003efailure:\u003c/span\u003e^(\u003cspan class=\"pl-c1\"\u003eNSURLSessionDataTask\u003c/span\u003e * _Nullable task, \u003cspan class=\"pl-c1\"\u003eNSError\u003c/span\u003e * _Nonnull error) {\n [promise \u003cspan class=\"pl-c1\"\u003ereject:\u003c/span\u003eerror];\n }];\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e promise;\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThen we can use the method in the coroutine：\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"co_launch(^{\n id response = await([self co_GET:feedModel.feedUrl parameters:nil]);\n if(co_getError()){\n //handle error message\n }\n ...\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-en\"\u003eco_launch\u003c/span\u003e(^{\n \u003cspan class=\"pl-c1\"\u003eid\u003c/span\u003e response = \u003cspan class=\"pl-c1\"\u003eawait\u003c/span\u003e([\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eco_GET:\u003c/span\u003efeedModel.feedUrl \u003cspan class=\"pl-c1\"\u003eparameters:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e]);\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eco_getError\u003c/span\u003e()){\n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003ehandle error message\u003c/span\u003e\n }\n ...\n});\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGenerator\u003c/h4\u003e\u003ca id=\"user-content-generator\" class=\"anchor\" aria-label=\"Permalink: Generator\" href=\"#generator\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ecreate generator\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eWe use co_sequence to create the generator\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"COCoroutine *co1 = co_sequence(^{\n int index = 0;\n while(co_isActive()){\n yield_val(@(index));\n index++;\n }\n });\"\u003e\u003cpre\u003eCOCoroutine *co1 = co_sequence(^{\n \u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e;\n \u003cspan class=\"pl-k\"\u003ewhile\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eco_isActive\u003c/span\u003e()){\n \u003cspan class=\"pl-c1\"\u003eyield_val\u003c/span\u003e(@(\u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e));\n \u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e++;\n }\n });\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn other coroutines, we can call the next method to get the data in the generator.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"co_launch(^{\n for(int i = 0; i \u0026lt; 10; i++){\n val = [[co1 next] intValue];\n }\n });\"\u003e\u003cpre\u003e\u003cspan class=\"pl-en\"\u003eco_launch\u003c/span\u003e(^{\n \u003cspan class=\"pl-k\"\u003efor\u003c/span\u003e(\u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e i = \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e; i \u0026lt; \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e; i++){\n val = [[co1 \u003cspan class=\"pl-c1\"\u003enext\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003eintValue\u003c/span\u003e];\n }\n });\u003c/pre\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003euse case\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThe generator can be used in many scenarios, such as message queues, batch download files, bulk load caches, etc.:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"int unreadMessageCount = 10;\nNSString *userId = @\u0026quot;xxx\u0026quot;;\nCOSequence *messageSequence = co_sequence_onqueue(background_queue, ^{\n //thread execution in the background\n while(1){\n yield(queryOneNewMessageForUserWithId(userId));\n }\n});\n\n//Main thread update UI\nco_launch(^{\n for(int i = 0; i \u0026lt; unreadMessageCount; i++){\n if(!isQuitCurrentView()){\n displayMessage([messageSequence next]);\n }\n }\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e unreadMessageCount = \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e;\n\u003cspan class=\"pl-c1\"\u003eNSString\u003c/span\u003e *userId = \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003exxx\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e;\nCOSequence *messageSequence = co_sequence_onqueue(background_queue, ^{\n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003ethread execution in the background\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ewhile\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e){\n \u003cspan class=\"pl-c1\"\u003eyield\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003equeryOneNewMessageForUserWithId\u003c/span\u003e(userId));\n }\n});\n\n\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003eMain thread update UI\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eco_launch\u003c/span\u003e(^{\n \u003cspan class=\"pl-k\"\u003efor\u003c/span\u003e(\u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e i = \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e; i \u0026lt; unreadMessageCount; i++){\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e(!\u003cspan class=\"pl-c1\"\u003eisQuitCurrentView\u003c/span\u003e()){\n \u003cspan class=\"pl-c1\"\u003edisplayMessage\u003c/span\u003e([messageSequence \u003cspan class=\"pl-c1\"\u003enext\u003c/span\u003e]);\n }\n }\n});\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThrough the generator, we can load the data from the traditional producer--notifying the consumer model, turning the consumer into the data--\u0026gt;telling the producer to load the pattern, avoiding the need to use many shared variables for the state in multi-threaded computing. Synchronization eliminates the use of locks in certain scenarios.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eActor\u003c/h4\u003e\u003ca id=\"user-content-actor\" class=\"anchor\" aria-label=\"Permalink: Actor\" href=\"#actor\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003e\u003cem\u003eThe concept of Actor comes from Erlang. In AKKA, an Actor can be thought of as a container for storing state, behavior, Mailbox, and child Actor and Supervisor policies. Actors do not communicate directly, but use Mail to communicate with each other.\u003c/em\u003e\u003c/strong\u003e\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ecreate actor\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eWe can use co_actor_onqueue to create an actor in the specified thread.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"COActor *actor = co_actor_onqueue(q, ^(COActorChan *channel) {\n ... //Define the state variable of the actor\n\n for(COActorMessage *message in channel){\n ...//handle message\n }\n});\"\u003e\u003cpre\u003eCOActor *actor = co_actor_onqueue(q, ^(COActorChan *channel) {\n ... \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003eDefine the state variable of the actor\u003c/span\u003e\n\n \u003cspan class=\"pl-k\"\u003efor\u003c/span\u003e(COActorMessage *message in channel){\n ...\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003ehandle message\u003c/span\u003e\n }\n});\u003c/pre\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003esend a message to the actor\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThe actor's send method can send a message to the actor\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"COActor *actor = co_actor_onqueue(q, ^(COActorChan *channel) {\n ... //Define the state variable of the actor\n\n for(COActorMessage *message in channel){\n ...//handle message\n }\n});\n\n// send a message to the actor\n[actor send:@\u0026quot;sadf\u0026quot;];\n[actor send:@(1)];\"\u003e\u003cpre\u003eCOActor *actor = co_actor_onqueue(q, ^(COActorChan *channel) {\n ... \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003eDefine the state variable of the actor\u003c/span\u003e\n\n \u003cspan class=\"pl-k\"\u003efor\u003c/span\u003e(COActorMessage *message in channel){\n ...\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003ehandle message\u003c/span\u003e\n }\n});\n\n\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003e send a message to the actor\u003c/span\u003e\n[actor \u003cspan class=\"pl-c1\"\u003esend:\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003esadf\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e];\n[actor \u003cspan class=\"pl-c1\"\u003esend:\u003c/span\u003e@(\u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e)];\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003etuple\u003c/h4\u003e\u003ca id=\"user-content-tuple\" class=\"anchor\" aria-label=\"Permalink: tuple\" href=\"#tuple\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ecreate tuple\nwe provide co_tuple method to create tuple\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"COTuple *tup = co_tuple(nil, @10, @\u0026quot;abc\u0026quot;);\nNSAssert(tup[0] == nil, @\u0026quot;tup[0] is wrong\u0026quot;);\nNSAssert([tup[1] intValue] == 10, @\u0026quot;tup[1] is wrong\u0026quot;);\nNSAssert([tup[2] isEqualToString:@\u0026quot;abc\u0026quot;], @\u0026quot;tup[2] is wrong\u0026quot;);\"\u003e\u003cpre\u003eCOTuple *tup = co_tuple(\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, @\u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e(tup[\u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e] == \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003etup[0] is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e([tup[\u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003eintValue\u003c/span\u003e] == \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003etup[1] is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e([tup[\u003cspan class=\"pl-c1\"\u003e2\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003eisEqualToString:\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e], \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003etup[2] is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eyou can store any value in tuple\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eunpack tuple\nwe provide co_unpack method to unpack tuple\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"id val0;\nNSNumber *number = nil;\nNSString *str = nil;\nco_unpack(\u0026amp;val0, \u0026amp;number, \u0026amp;str) = co_tuple(nil, @10, @\u0026quot;abc\u0026quot;);\nNSAssert(val0 == nil, @\u0026quot;val0 is wrong\u0026quot;);\nNSAssert([number intValue] == 10, @\u0026quot;number is wrong\u0026quot;);\nNSAssert([str isEqualToString:@\u0026quot;abc\u0026quot;], @\u0026quot;str is wrong\u0026quot;);\n\nco_unpack(\u0026amp;val0, \u0026amp;number, \u0026amp;str) = co_tuple(nil, @10, @\u0026quot;abc\u0026quot;, @10, @\u0026quot;abc\u0026quot;);\nNSAssert(val0 == nil, @\u0026quot;val0 is wrong\u0026quot;);\nNSAssert([number intValue] == 10, @\u0026quot;number is wrong\u0026quot;);\nNSAssert([str isEqualToString:@\u0026quot;abc\u0026quot;], @\u0026quot;str is wrong\u0026quot;);\n\nco_unpack(\u0026amp;val0, \u0026amp;number, \u0026amp;str, \u0026amp;number, \u0026amp;str) = co_tuple(nil, @10, @\u0026quot;abc\u0026quot;);\nNSAssert(val0 == nil, @\u0026quot;val0 is wrong\u0026quot;);\nNSAssert([number intValue] == 10, @\u0026quot;number is wrong\u0026quot;);\nNSAssert([str isEqualToString:@\u0026quot;abc\u0026quot;], @\u0026quot;str is wrong\u0026quot;);\n\nNSString *str1;\n\nco_unpack(nil, nil, \u0026amp;str1) = co_tuple(nil, @10, @\u0026quot;abc\u0026quot;);\nNSAssert([str1 isEqualToString:@\u0026quot;abc\u0026quot;], @\u0026quot;str1 is wrong\u0026quot;);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c1\"\u003eid\u003c/span\u003e val0;\n\u003cspan class=\"pl-c1\"\u003eNSNumber\u003c/span\u003e *number = \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e;\n\u003cspan class=\"pl-c1\"\u003eNSString\u003c/span\u003e *str = \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e;\n\u003cspan class=\"pl-en\"\u003eco_unpack\u003c/span\u003e(\u0026amp;val0, \u0026amp;number, \u0026amp;str) = co_tuple(\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, @\u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e(val0 == \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eval0 is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e([number \u003cspan class=\"pl-c1\"\u003eintValue\u003c/span\u003e] == \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003enumber is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e([str \u003cspan class=\"pl-c1\"\u003eisEqualToString:\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e], \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003estr is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\n\u003cspan class=\"pl-en\"\u003eco_unpack\u003c/span\u003e(\u0026amp;val0, \u0026amp;number, \u0026amp;str) = co_tuple(\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, @\u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e, @\u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e(val0 == \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eval0 is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e([number \u003cspan class=\"pl-c1\"\u003eintValue\u003c/span\u003e] == \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003enumber is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e([str \u003cspan class=\"pl-c1\"\u003eisEqualToString:\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e], \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003estr is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\n\u003cspan class=\"pl-en\"\u003eco_unpack\u003c/span\u003e(\u0026amp;val0, \u0026amp;number, \u0026amp;str, \u0026amp;number, \u0026amp;str) = co_tuple(\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, @\u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e(val0 == \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eval0 is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e([number \u003cspan class=\"pl-c1\"\u003eintValue\u003c/span\u003e] == \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003enumber is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e([str \u003cspan class=\"pl-c1\"\u003eisEqualToString:\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e], \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003estr is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\n\u003cspan class=\"pl-c1\"\u003eNSString\u003c/span\u003e *str1;\n\n\u003cspan class=\"pl-en\"\u003eco_unpack\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, \u0026amp;str1) = co_tuple(\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, @\u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n\u003cspan class=\"pl-en\"\u003eNSAssert\u003c/span\u003e([str1 \u003cspan class=\"pl-c1\"\u003eisEqualToString:\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eabc\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e], \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003estr1 is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\u003c/pre\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003euse tuple in coroutine\nfirst create a promise that resolve tuple value\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"COPromise\u0026lt;COTuple*\u0026gt;*\ncotest_loadContentFromFile(NSString *filePath){\n return [COPromise promise:^(COPromiseFullfill _Nonnull resolve, COPromiseReject _Nonnull reject) {\n if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {\n NSData *data = [[NSData alloc] initWithContentsOfFile:filePath];\n resolve(co_tuple(filePath, data, nil));\n }\n else{\n NSError *error = [NSError errorWithDomain:@\u0026quot;fileNotFound\u0026quot; code:-1 userInfo:nil];\n resolve(co_tuple(filePath, nil, error));\n }\n }];\n}\"\u003e\u003cpre\u003eCOPromise\u0026lt;COTuple*\u0026gt;*\n\u003cspan class=\"pl-en\"\u003ecotest_loadContentFromFile\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eNSString\u003c/span\u003e *filePath){\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e [COPromise \u003cspan class=\"pl-c1\"\u003epromise:\u003c/span\u003e^(COPromiseFullfill _Nonnull resolve, COPromiseReject _Nonnull reject) {\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e ([[\u003cspan class=\"pl-c1\"\u003eNSFileManager\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003edefaultManager\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003efileExistsAtPath:\u003c/span\u003efilePath]) {\n \u003cspan class=\"pl-c1\"\u003eNSData\u003c/span\u003e *data = [[\u003cspan class=\"pl-c1\"\u003eNSData\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ealloc\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003einitWithContentsOfFile:\u003c/span\u003efilePath];\n \u003cspan class=\"pl-c1\"\u003eresolve\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eco_tuple\u003c/span\u003e(filePath, data, \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e));\n }\n \u003cspan class=\"pl-k\"\u003eelse\u003c/span\u003e{\n \u003cspan class=\"pl-c1\"\u003eNSError\u003c/span\u003e *error = [\u003cspan class=\"pl-c1\"\u003eNSError\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eerrorWithDomain:\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003efileNotFound\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ecode:\u003c/span\u003e-\u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003euserInfo:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e];\n \u003cspan class=\"pl-c1\"\u003eresolve\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eco_tuple\u003c/span\u003e(filePath, \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, error));\n }\n }];\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ethen you can fetch the value like this:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"co_launch(^{\n NSString *tmpFilePath = nil;\n NSData *data = nil;\n NSError *error = nil;\n co_unpack(\u0026amp;tmpFilePath, \u0026amp;data, \u0026amp;error) = await(cotest_loadContentFromFile(filePath));\n XCTAssert([tmpFilePath isEqualToString:filePath], @\u0026quot;file path is wrong\u0026quot;);\n XCTAssert(data.length \u0026gt; 0, @\u0026quot;data is wrong\u0026quot;);\n XCTAssert(error == nil, @\u0026quot;error is wrong\u0026quot;);\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-en\"\u003eco_launch\u003c/span\u003e(^{\n \u003cspan class=\"pl-c1\"\u003eNSString\u003c/span\u003e *tmpFilePath = \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e;\n \u003cspan class=\"pl-c1\"\u003eNSData\u003c/span\u003e *data = \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e;\n \u003cspan class=\"pl-c1\"\u003eNSError\u003c/span\u003e *error = \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e;\n \u003cspan class=\"pl-c1\"\u003eco_unpack\u003c/span\u003e(\u0026amp;tmpFilePath, \u0026amp;data, \u0026amp;error) = \u003cspan class=\"pl-c1\"\u003eawait\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003ecotest_loadContentFromFile\u003c/span\u003e(filePath));\n \u003cspan class=\"pl-c1\"\u003eXCTAssert\u003c/span\u003e([tmpFilePath \u003cspan class=\"pl-c1\"\u003eisEqualToString:\u003c/span\u003efilePath], \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003efile path is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n \u003cspan class=\"pl-c1\"\u003eXCTAssert\u003c/span\u003e(data.\u003cspan class=\"pl-smi\"\u003elength\u003c/span\u003e \u0026gt; \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003edata is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n \u003cspan class=\"pl-c1\"\u003eXCTAssert\u003c/span\u003e(error == \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eerror is wrong\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n});\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003euse tuple you can get multiple values from await return\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eActual case using coobjc\u003c/h4\u003e\u003ca id=\"user-content-actual-case-using-coobjc\" class=\"anchor\" aria-label=\"Permalink: Actual case using coobjc\" href=\"#actual-case-using-coobjc\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eLet's take the code of the Feeds stream update in the GCDFetchFeed open source project as an example to demonstrate the actual usage scenarios and advantages of the coroutine. The following is the original implementation of not using coroutine：\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"- (RACSignal *)fetchAllFeedWithModelArray:(NSMutableArray *)modelArray {\n @weakify(self);\n return [RACSignal createSignal:^RACDisposable *(id\u0026lt;RACSubscriber\u0026gt; subscriber) {\n @strongify(self);\n //Create a parallel queue\n dispatch_queue_t fetchFeedQueue = dispatch_queue_create(\u0026quot;com.starming.fetchfeed.fetchfeed\u0026quot;, DISPATCH_QUEUE_CONCURRENT);\n dispatch_group_t group = dispatch_group_create();\n self.feeds = modelArray;\n for (int i = 0; i \u0026lt; modelArray.count; i++) {\n dispatch_group_enter(group);\n SMFeedModel *feedModel = modelArray[i];\n feedModel.isSync = NO;\n [self GET:feedModel.feedUrl parameters:nil progress:nil success:^(NSURLSessionTask *task, id responseObject) {\n dispatch_async(fetchFeedQueue, ^{\n @strongify(self);\n //parse feed\n self.feeds[i] = [self.feedStore updateFeedModelWithData:responseObject preModel:feedModel];\n //save to db\n SMDB *db = [SMDB shareInstance];\n @weakify(db);\n [[db insertWithFeedModel:self.feeds[i]] subscribeNext:^(NSNumber *x) {\n @strongify(db);\n SMFeedModel *model = (SMFeedModel *)self.feeds[i];\n model.fid = [x integerValue];\n if (model.imageUrl.length \u0026gt; 0) {\n NSString *fidStr = [x stringValue];\n db.feedIcons[fidStr] = model.imageUrl;\n }\n //sendNext\n [subscriber sendNext:@(i)];\n //Notification single completion\n dispatch_group_leave(group);\n }];\n \n });//end dispatch async\n \n } failure:^(NSURLSessionTask *operation, NSError *error) {\n NSLog(@\u0026quot;Error: %@\u0026quot;, error);\n dispatch_async(fetchFeedQueue, ^{\n @strongify(self);\n [[[SMDB shareInstance] insertWithFeedModel:self.feeds[i]] subscribeNext:^(NSNumber *x) {\n SMFeedModel *model = (SMFeedModel *)self.feeds[i];\n model.fid = [x integerValue];\n dispatch_group_leave(group);\n }];\n \n });//end dispatch async\n \n }];\n \n }//end for\n //Execution event after all is completed\n dispatch_group_notify(group, dispatch_get_main_queue(), ^{\n [subscriber sendCompleted];\n });\n return nil;\n }];\n}\"\u003e\u003cpre\u003e- (RACSignal *)fetchAllFeedWithModelArray:(\u003cspan class=\"pl-c1\"\u003eNSMutableArray\u003c/span\u003e *)modelArray {\n @\u003cspan class=\"pl-c1\"\u003eweakify\u003c/span\u003e(self);\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e [RACSignal \u003cspan class=\"pl-c1\"\u003ecreateSignal:\u003c/span\u003e^RACDisposable *(\u003cspan class=\"pl-k\"\u003eid\u003c/span\u003e\u0026lt;RACSubscriber\u0026gt; subscriber) {\n @\u003cspan class=\"pl-c1\"\u003estrongify\u003c/span\u003e(self);\n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003eCreate a parallel queue\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003edispatch_queue_t\u003c/span\u003e fetchFeedQueue = \u003cspan class=\"pl-c1\"\u003edispatch_queue_create\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003ecom.starming.fetchfeed.fetchfeed\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e, DISPATCH_QUEUE_CONCURRENT);\n \u003cspan class=\"pl-c1\"\u003edispatch_group_t\u003c/span\u003e group = \u003cspan class=\"pl-c1\"\u003edispatch_group_create\u003c/span\u003e();\n self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e = modelArray;\n \u003cspan class=\"pl-k\"\u003efor\u003c/span\u003e (\u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e i = \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e; i \u0026lt; modelArray.\u003cspan class=\"pl-smi\"\u003ecount\u003c/span\u003e; i++) {\n \u003cspan class=\"pl-c1\"\u003edispatch_group_enter\u003c/span\u003e(group);\n SMFeedModel *feedModel = modelArray[i];\n feedModel.\u003cspan class=\"pl-smi\"\u003eisSync\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003eNO\u003c/span\u003e;\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eGET:\u003c/span\u003efeedModel.feedUrl \u003cspan class=\"pl-c1\"\u003eparameters:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eprogress:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003esuccess:\u003c/span\u003e^(\u003cspan class=\"pl-c1\"\u003eNSURLSessionTask\u003c/span\u003e *task, \u003cspan class=\"pl-c1\"\u003eid\u003c/span\u003e responseObject) {\n \u003cspan class=\"pl-c1\"\u003edispatch_async\u003c/span\u003e(fetchFeedQueue, ^{\n @\u003cspan class=\"pl-c1\"\u003estrongify\u003c/span\u003e(self);\n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003eparse feed\u003c/span\u003e\n self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e[i] = [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.feedStore \u003cspan class=\"pl-c1\"\u003eupdateFeedModelWithData:\u003c/span\u003eresponseObject \u003cspan class=\"pl-c1\"\u003epreModel:\u003c/span\u003efeedModel];\n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003esave to db\u003c/span\u003e\n SMDB *db = [SMDB \u003cspan class=\"pl-c1\"\u003eshareInstance\u003c/span\u003e];\n @\u003cspan class=\"pl-c1\"\u003eweakify\u003c/span\u003e(db);\n [[db \u003cspan class=\"pl-c1\"\u003einsertWithFeedModel:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.feeds[i]] \u003cspan class=\"pl-c1\"\u003esubscribeNext:\u003c/span\u003e^(\u003cspan class=\"pl-c1\"\u003eNSNumber\u003c/span\u003e *x) {\n @\u003cspan class=\"pl-c1\"\u003estrongify\u003c/span\u003e(db);\n SMFeedModel *model = (SMFeedModel *)self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e[i];\n model.\u003cspan class=\"pl-smi\"\u003efid\u003c/span\u003e = [x \u003cspan class=\"pl-c1\"\u003eintegerValue\u003c/span\u003e];\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e (model.\u003cspan class=\"pl-smi\"\u003eimageUrl\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003elength\u003c/span\u003e \u0026gt; \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e) {\n \u003cspan class=\"pl-c1\"\u003eNSString\u003c/span\u003e *fidStr = [x \u003cspan class=\"pl-c1\"\u003estringValue\u003c/span\u003e];\n db.\u003cspan class=\"pl-smi\"\u003efeedIcons\u003c/span\u003e[fidStr] = model.\u003cspan class=\"pl-smi\"\u003eimageUrl\u003c/span\u003e;\n }\n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003esendNext\u003c/span\u003e\n [subscriber \u003cspan class=\"pl-c1\"\u003esendNext:\u003c/span\u003e@(i)];\n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003eNotification single completion\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003edispatch_group_leave\u003c/span\u003e(group);\n }];\n \n });\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003eend dispatch async\u003c/span\u003e\n \n } \u003cspan class=\"pl-c1\"\u003efailure:\u003c/span\u003e^(\u003cspan class=\"pl-c1\"\u003eNSURLSessionTask\u003c/span\u003e *operation, \u003cspan class=\"pl-c1\"\u003eNSError\u003c/span\u003e *error) {\n \u003cspan class=\"pl-c1\"\u003eNSLog\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003eError: \u003cspan class=\"pl-c1\"\u003e%@\u003c/span\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e, error);\n \u003cspan class=\"pl-c1\"\u003edispatch_async\u003c/span\u003e(fetchFeedQueue, ^{\n @\u003cspan class=\"pl-c1\"\u003estrongify\u003c/span\u003e(self);\n [[[SMDB \u003cspan class=\"pl-c1\"\u003eshareInstance\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003einsertWithFeedModel:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.feeds[i]] \u003cspan class=\"pl-c1\"\u003esubscribeNext:\u003c/span\u003e^(\u003cspan class=\"pl-c1\"\u003eNSNumber\u003c/span\u003e *x) {\n SMFeedModel *model = (SMFeedModel *)self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e[i];\n model.\u003cspan class=\"pl-smi\"\u003efid\u003c/span\u003e = [x \u003cspan class=\"pl-c1\"\u003eintegerValue\u003c/span\u003e];\n \u003cspan class=\"pl-c1\"\u003edispatch_group_leave\u003c/span\u003e(group);\n }];\n \n });\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003eend dispatch async\u003c/span\u003e\n \n }];\n \n }\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003eend for\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003eExecution event after all is completed\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003edispatch_group_notify\u003c/span\u003e(group, \u003cspan class=\"pl-c1\"\u003edispatch_get_main_queue\u003c/span\u003e(), ^{\n [subscriber \u003cspan class=\"pl-c1\"\u003esendCompleted\u003c/span\u003e];\n });\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e;\n }];\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe following is the call to the above method in viewDidLoad:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;\nself.fetchingCount = 0;\n@weakify(self);\n[[[[[[SMNetManager shareInstance] fetchAllFeedWithModelArray:self.feeds] map:^id(NSNumber *value) {\n @strongify(self);\n NSUInteger index = [value integerValue];\n self.feeds[index] = [SMNetManager shareInstance].feeds[index];\n return self.feeds[index];\n}] doCompleted:^{\n @strongify(self);\n NSLog(@\u0026quot;fetch complete\u0026quot;);\n self.tbHeaderLabel.text = @\u0026quot;\u0026quot;;\n self.tableView.tableHeaderView = [[UIView alloc] init];\n self.fetchingCount = 0;\n [self.tableView.mj_header endRefreshing];\n [self.tableView reloadData];\n if ([SMFeedStore defaultFeeds].count \u0026gt; self.feeds.count) {\n self.feeds = [SMFeedStore defaultFeeds];\n [self fetchAllFeeds];\n }\n [self cacheFeedItems];\n}] deliverOn:[RACScheduler mainThreadScheduler]] subscribeNext:^(SMFeedModel *feedModel) {\n @strongify(self);\n self.tableView.tableHeaderView = self.tbHeaderView;\n self.fetchingCount += 1;\n self.tbHeaderLabel.text = [NSString stringWithFormat:@\u0026quot;正在获取%@...(%lu/%lu)\u0026quot;,feedModel.title,(unsigned long)self.fetchingCount,(unsigned long)self.feeds.count];\n feedModel.isSync = YES;\n [self.tableView reloadData];\n}];\"\u003e\u003cpre\u003e[UIApplication \u003cspan class=\"pl-c1\"\u003esharedApplication\u003c/span\u003e].networkActivityIndicatorVisible = \u003cspan class=\"pl-c1\"\u003eYES\u003c/span\u003e;\nself.fetchingCount = \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e;\n@weakify(self);\n[[[[[[SMNetManager \u003cspan class=\"pl-c1\"\u003eshareInstance\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003efetchAllFeedWithModelArray:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.feeds] \u003cspan class=\"pl-c1\"\u003emap:\u003c/span\u003e^\u003cspan class=\"pl-c1\"\u003eid\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eNSNumber\u003c/span\u003e *value) {\n @\u003cspan class=\"pl-c1\"\u003estrongify\u003c/span\u003e(self);\n \u003cspan class=\"pl-c1\"\u003eNSUInteger\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e = [value \u003cspan class=\"pl-c1\"\u003eintegerValue\u003c/span\u003e];\n self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e[\u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e] = [SMNetManager \u003cspan class=\"pl-c1\"\u003eshareInstance\u003c/span\u003e].\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e[\u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e];\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e[\u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e];\n}] \u003cspan class=\"pl-c1\"\u003edoCompleted:\u003c/span\u003e^{\n @\u003cspan class=\"pl-c1\"\u003estrongify\u003c/span\u003e(self);\n \u003cspan class=\"pl-c1\"\u003eNSLog\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003efetch complete\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e);\n self.\u003cspan class=\"pl-smi\"\u003etbHeaderLabel\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003etext\u003c/span\u003e = \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e;\n self.\u003cspan class=\"pl-smi\"\u003etableView\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003etableHeaderView\u003c/span\u003e = [[UIView \u003cspan class=\"pl-c1\"\u003ealloc\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003einit\u003c/span\u003e];\n self.\u003cspan class=\"pl-smi\"\u003efetchingCount\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e;\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.tableView.mj_header \u003cspan class=\"pl-c1\"\u003eendRefreshing\u003c/span\u003e];\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.tableView \u003cspan class=\"pl-c1\"\u003ereloadData\u003c/span\u003e];\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e ([SMFeedStore \u003cspan class=\"pl-c1\"\u003edefaultFeeds\u003c/span\u003e].\u003cspan class=\"pl-smi\"\u003ecount\u003c/span\u003e \u0026gt; self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003ecount\u003c/span\u003e) {\n self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e = [SMFeedStore \u003cspan class=\"pl-c1\"\u003edefaultFeeds\u003c/span\u003e];\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003efetchAllFeeds\u003c/span\u003e];\n }\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ecacheFeedItems\u003c/span\u003e];\n}] \u003cspan class=\"pl-c1\"\u003edeliverOn:\u003c/span\u003e[RACScheduler \u003cspan class=\"pl-c1\"\u003emainThreadScheduler\u003c/span\u003e]] \u003cspan class=\"pl-c1\"\u003esubscribeNext:\u003c/span\u003e^(SMFeedModel *feedModel) {\n @\u003cspan class=\"pl-c1\"\u003estrongify\u003c/span\u003e(self);\n self.\u003cspan class=\"pl-smi\"\u003etableView\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003etableHeaderView\u003c/span\u003e = self.\u003cspan class=\"pl-smi\"\u003etbHeaderView\u003c/span\u003e;\n self.\u003cspan class=\"pl-smi\"\u003efetchingCount\u003c/span\u003e += \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e;\n self.\u003cspan class=\"pl-smi\"\u003etbHeaderLabel\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003etext\u003c/span\u003e = [\u003cspan class=\"pl-c1\"\u003eNSString\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003estringWithFormat:\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003e正在获取\u003cspan class=\"pl-c1\"\u003e%@\u003c/span\u003e...(\u003cspan class=\"pl-c1\"\u003e%lu\u003c/span\u003e/\u003cspan class=\"pl-c1\"\u003e%lu\u003c/span\u003e)\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e,feedModel.title,(\u003cspan class=\"pl-k\"\u003eunsigned\u003c/span\u003e \u003cspan class=\"pl-k\"\u003elong\u003c/span\u003e)\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.fetchingCount,(\u003cspan class=\"pl-k\"\u003eunsigned\u003c/span\u003e \u003cspan class=\"pl-k\"\u003elong\u003c/span\u003e)\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.feeds.count];\n feedModel.\u003cspan class=\"pl-smi\"\u003eisSync\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003eYES\u003c/span\u003e;\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.tableView \u003cspan class=\"pl-c1\"\u003ereloadData\u003c/span\u003e];\n}];\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe above code is relatively poor in terms of readability and simplicity. Let's take a look at the code after using the coroutine transformation:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"- (SMFeedModel*)co_fetchFeedModelWithUrl:(SMFeedModel*)feedModel{\n feedModel.isSync = NO;\n id response = await([self co_GET:feedModel.feedUrl parameters:nil]);\n if (response) {\n SMFeedModel *resultModel = await([self co_updateFeedModelWithData:response preModel:feedModel]);\n int fid = [[SMDB shareInstance] co_insertWithFeedModel:resultModel];\n resultModel.fid = fid;\n if (resultModel.imageUrl.length \u0026gt; 0) {\n NSString *fidStr = [@(fid) stringValue];\n [SMDB shareInstance].feedIcons[fidStr] = resultModel.imageUrl;\n }\n return resultModel;\n }\n int fid = [[SMDB shareInstance] co_insertWithFeedModel:feedModel];\n feedModel.fid = fid;\n return nil;\n}\"\u003e\u003cpre\u003e- (SMFeedModel*)co_fetchFeedModelWithUrl:(SMFeedModel*)feedModel{\n feedModel.\u003cspan class=\"pl-smi\"\u003eisSync\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003eNO\u003c/span\u003e;\n \u003cspan class=\"pl-c1\"\u003eid\u003c/span\u003e response = \u003cspan class=\"pl-c1\"\u003eawait\u003c/span\u003e([\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eco_GET:\u003c/span\u003efeedModel.feedUrl \u003cspan class=\"pl-c1\"\u003eparameters:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e]);\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e (response) {\n SMFeedModel *resultModel = \u003cspan class=\"pl-c1\"\u003eawait\u003c/span\u003e([\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eco_updateFeedModelWithData:\u003c/span\u003eresponse \u003cspan class=\"pl-c1\"\u003epreModel:\u003c/span\u003efeedModel]);\n \u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e fid = [[SMDB \u003cspan class=\"pl-c1\"\u003eshareInstance\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003eco_insertWithFeedModel:\u003c/span\u003eresultModel];\n resultModel.\u003cspan class=\"pl-smi\"\u003efid\u003c/span\u003e = fid;\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e (resultModel.\u003cspan class=\"pl-smi\"\u003eimageUrl\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003elength\u003c/span\u003e \u0026gt; \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e) {\n \u003cspan class=\"pl-c1\"\u003eNSString\u003c/span\u003e *fidStr = [@(fid) \u003cspan class=\"pl-c1\"\u003estringValue\u003c/span\u003e];\n [SMDB \u003cspan class=\"pl-c1\"\u003eshareInstance\u003c/span\u003e].\u003cspan class=\"pl-smi\"\u003efeedIcons\u003c/span\u003e[fidStr] = resultModel.\u003cspan class=\"pl-smi\"\u003eimageUrl\u003c/span\u003e;\n }\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e resultModel;\n }\n \u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e fid = [[SMDB \u003cspan class=\"pl-c1\"\u003eshareInstance\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003eco_insertWithFeedModel:\u003c/span\u003efeedModel];\n feedModel.\u003cspan class=\"pl-smi\"\u003efid\u003c/span\u003e = fid;\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e;\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHere is the place in viewDidLoad that uses the coroutine to call the interface:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-objc notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"co_launch(^{\n for (NSUInteger index = 0; index \u0026lt; self.feeds.count; index++) {\n SMFeedModel *model = self.feeds[index];\n self.tableView.tableHeaderView = self.tbHeaderView;\n self.tbHeaderLabel.text = [NSString stringWithFormat:@\u0026quot;正在获取%@...(%lu/%lu)\u0026quot;,model.title,(unsigned long)(index + 1),(unsigned long)self.feeds.count];\n model.isSync = YES;\n SMFeedModel *resultMode = [[SMNetManager shareInstance] co_fetchFeedModelWithUrl:model];\n if (resultMode) {\n self.feeds[index] = resultMode;\n [self.tableView reloadData];\n }\n }\n self.tbHeaderLabel.text = @\u0026quot;\u0026quot;;\n self.tableView.tableHeaderView = [[UIView alloc] init];\n self.fetchingCount = 0;\n [self.tableView.mj_header endRefreshing];\n [self.tableView reloadData];\n [self cacheFeedItems];\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-en\"\u003eco_launch\u003c/span\u003e(^{\n \u003cspan class=\"pl-k\"\u003efor\u003c/span\u003e (\u003cspan class=\"pl-c1\"\u003eNSUInteger\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e; \u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e \u0026lt; self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003ecount\u003c/span\u003e; \u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e++) {\n SMFeedModel *model = self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e[\u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e];\n self.\u003cspan class=\"pl-smi\"\u003etableView\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003etableHeaderView\u003c/span\u003e = self.\u003cspan class=\"pl-smi\"\u003etbHeaderView\u003c/span\u003e;\n self.\u003cspan class=\"pl-smi\"\u003etbHeaderLabel\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003etext\u003c/span\u003e = [\u003cspan class=\"pl-c1\"\u003eNSString\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003estringWithFormat:\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003e正在获取\u003cspan class=\"pl-c1\"\u003e%@\u003c/span\u003e...(\u003cspan class=\"pl-c1\"\u003e%lu\u003c/span\u003e/\u003cspan class=\"pl-c1\"\u003e%lu\u003c/span\u003e)\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e,model.title,(\u003cspan class=\"pl-k\"\u003eunsigned\u003c/span\u003e \u003cspan class=\"pl-k\"\u003elong\u003c/span\u003e)(\u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e + \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e),(\u003cspan class=\"pl-k\"\u003eunsigned\u003c/span\u003e \u003cspan class=\"pl-k\"\u003elong\u003c/span\u003e)\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.feeds.count];\n model.\u003cspan class=\"pl-smi\"\u003eisSync\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003eYES\u003c/span\u003e;\n SMFeedModel *resultMode = [[SMNetManager \u003cspan class=\"pl-c1\"\u003eshareInstance\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003eco_fetchFeedModelWithUrl:\u003c/span\u003emodel];\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e (resultMode) {\n self.\u003cspan class=\"pl-smi\"\u003efeeds\u003c/span\u003e[\u003cspan class=\"pl-c1\"\u003eindex\u003c/span\u003e] = resultMode;\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.tableView \u003cspan class=\"pl-c1\"\u003ereloadData\u003c/span\u003e];\n }\n }\n self.\u003cspan class=\"pl-smi\"\u003etbHeaderLabel\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003etext\u003c/span\u003e = \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e@\"\u003c/span\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e;\n self.\u003cspan class=\"pl-smi\"\u003etableView\u003c/span\u003e.\u003cspan class=\"pl-smi\"\u003etableHeaderView\u003c/span\u003e = [[UIView \u003cspan class=\"pl-c1\"\u003ealloc\u003c/span\u003e] \u003cspan class=\"pl-c1\"\u003einit\u003c/span\u003e];\n self.\u003cspan class=\"pl-smi\"\u003efetchingCount\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e;\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.tableView.mj_header \u003cspan class=\"pl-c1\"\u003eendRefreshing\u003c/span\u003e];\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e.tableView \u003cspan class=\"pl-c1\"\u003ereloadData\u003c/span\u003e];\n [\u003cspan class=\"pl-c1\"\u003eself\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ecacheFeedItems\u003c/span\u003e];\n});\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe code after the coroutine transformation has become easier to understand and less error-prone.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSwift\u003c/h4\u003e\u003ca id=\"user-content-swift\" class=\"anchor\" aria-label=\"Permalink: Swift\" href=\"#swift\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ecoobjc fully supports Swift through top-level encapsulation, enabling us to enjoy the coroutine ahead of time in Swift.\nBecause Swift has richer and more advanced syntax support, coobjc is more elegant in Swift, for example:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-swift notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"func test() {\n co_launch {//create coroutine\n //fetch data asynchronous\n let resultStr = try await(channel: co_fetchSomething())\n print(\u0026quot;result: \\(resultStr)\u0026quot;)\n }\n\n co_launch {//create coroutine\n //fetch data asynchronous\n let result = try await(promise: co_fetchSomethingAsynchronous())\n switch result {\n case .fulfilled(let data):\n print(\u0026quot;data: \\(String(describing: data))\u0026quot;)\n break\n case .rejected(let error):\n print(\u0026quot;error: \\(error)\u0026quot;)\n }\n }\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-en\"\u003efunc\u003c/span\u003e test\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eco_launch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e//create coroutine\n //fetch data asynchronous\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresultStr\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003echannel\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eco_fetchSomething\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eprint\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eresult: \u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\\(\u003c/span\u003eresultStr\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eco_launch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e//create coroutine\n //fetch data asynchronous\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003epromise\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eco_fetchSomethingAsynchronous\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eswitch\u003c/span\u003e result \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ecase\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003efulfilled\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e data\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eprint\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003edata: \u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\\(\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eString\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003edescribing\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e data\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ebreak\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ecase\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003erejected\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e error\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eprint\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eerror: \u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\\(\u003c/span\u003eerror\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x4 Advantages of the coroutine\u003c/h2\u003e\u003ca id=\"user-content-0x4-advantages-of-the-coroutine\" class=\"anchor\" aria-label=\"Permalink: 0x4 Advantages of the coroutine\" href=\"#0x4-advantages-of-the-coroutine\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eConcise\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eLess concept: there are only a few operators, compared to dozens of operators in response, it can't be simpler.\u003c/li\u003e\n\u003cli\u003eThe principle is simple: the implementation principle of the coroutine is very simple, the entire coroutine library has only a few thousand lines of code\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eEasy to use\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eSimple to use: it is easier to use than GCD, with few interfaces\u003c/li\u003e\n\u003cli\u003eEasy to retrofit: existing code can be corouted with only a few changes, and we have a large number of coroutine interfaces for the system library.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eClear\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eSynchronous write asynchronous logic: Synchronous sequential way of writing code is the most acceptable way for humans, which can greatly reduce the probability of error\u003c/li\u003e\n\u003cli\u003eHigh readability: Code written in coroutine mode is much more readable than block nested code\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eHigh performance\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eFaster scheduling performance: The coroutine itself does not need to switch between kernel-level threads, scheduling performance is fast, Even if you create tens of thousands of coroutines, there is no pressure.\u003c/li\u003e\n\u003cli\u003eReduce app block: The use of coroutines to help reduce the abuse of locks and semaphores, and to reduce the number of stalls and jams from the root cause by encapsulating the coroutine interfaces such as IOs that cause blocking, and improve the overall performance of the application.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x5 Communication\u003c/h2\u003e\u003ca id=\"user-content-0x5-communication\" class=\"anchor\" aria-label=\"Permalink: 0x5 Communication\" href=\"#0x5-communication\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eIf you \u003cstrong\u003eneed help\u003c/strong\u003e, use \u003ca href=\"http://stackoverflow.com/questions/tagged/coobjc\" rel=\"nofollow\"\u003eStack Overflow\u003c/a\u003e. (Tag 'coobjc')\u003c/li\u003e\n\u003cli\u003eIf you'd like to \u003cstrong\u003eask a general question\u003c/strong\u003e, use \u003ca href=\"http://stackoverflow.com/questions/tagged/coobjc\" rel=\"nofollow\"\u003eStack Overflow\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eIf you \u003cstrong\u003efound a bug\u003c/strong\u003e, \u003cem\u003eand can provide steps to reliably reproduce it\u003c/em\u003e, open an issue.\u003c/li\u003e\n\u003cli\u003eIf you \u003cstrong\u003ehave a feature request\u003c/strong\u003e, open an issue.\u003c/li\u003e\n\u003cli\u003eIf you \u003cstrong\u003ewant to contribute\u003c/strong\u003e, submit a pull request.\u003c/li\u003e\n\u003cli\u003eIf you are interested in \u003cstrong\u003ejoining Alibaba Taobao-Mobile architecture team\u003c/strong\u003e, please send your resume to \u003ca href=\"mailto:junzhan.yzw@taobao.com\"\u003ejunzhan\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x6 Unit Tests\u003c/h2\u003e\u003ca id=\"user-content-0x6-unit-tests\" class=\"anchor\" aria-label=\"Permalink: 0x6 Unit Tests\" href=\"#0x6-unit-tests\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ecoobjc includes a suite of unit tests within the Tests subdirectory. These tests can be run simply be executed the test action on the platform framework you would like to test. You can find coobjc's unit tests in Examples/coobjcBaseExample/coobjcBaseExampleTests. You can find cokit's unit tests in cokit/Examples/coKitExamples/coKitExamplesTests.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x7 Credits\u003c/h2\u003e\u003ca id=\"user-content-0x7-credits\" class=\"anchor\" aria-label=\"Permalink: 0x7 Credits\" href=\"#0x7-credits\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ecoobjc couldn't exist without:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/google/promises\"\u003ePromises\u003c/a\u003e - Google's Objective-C and Swift Promises framework.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://swtch.com/libtask/\" rel=\"nofollow\"\u003elibtask\u003c/a\u003e - A simple coroutine library.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/KMindeguia/movies\"\u003emovies\u003c/a\u003e - a ios demo app, we use the code in coobjc examples\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/singro/v2ex\"\u003ev2ex\u003c/a\u003e - An iOS client for v2ex.com, we use the code in coobjc examples\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/atg/tuples\"\u003etuples\u003c/a\u003e - Objective-C tuples.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/facebook/fishhook\"\u003efishhook\u003c/a\u003e - Rebinding symbols in Mach-O binaries\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/comyar/Sol\"\u003eSol\u003c/a\u003e - Sol° beautifully displays weather information so you can plan your day accordingly. Check the weather in your current location or any city around the world. Implemented in Objective-C.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/apple/swift\"\u003eSwift\u003c/a\u003e - The Swift Programming Language\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/apple/swift-corelibs-libdispatch\"\u003elibdispatch\u003c/a\u003e - The libdispatch Project, (a.k.a. Grand Central Dispatch), for concurrency on multicore hardware\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://opensource.apple.com/source/objc4/objc4-750.1/\" rel=\"nofollow\"\u003eobjc4\u003c/a\u003e - apple objc framework\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://blog.csdn.net/qq910894904/article/details/41911175\" rel=\"nofollow\"\u003ehttps://blog.csdn.net/qq910894904/article/details/41911175\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"http://www.voidcn.com/article/p-fwlohnnc-gc.html\" rel=\"nofollow\"\u003ehttp://www.voidcn.com/article/p-fwlohnnc-gc.html\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://blog.csdn.net/shenlei19911210/article/details/61194617\" rel=\"nofollow\"\u003ehttps://blog.csdn.net/shenlei19911210/article/details/61194617\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x8 Authors\u003c/h2\u003e\u003ca id=\"user-content-0x8-authors\" class=\"anchor\" aria-label=\"Permalink: 0x8 Authors\" href=\"#0x8-authors\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/pengyutang125\"\u003epengyutang125\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/NianJi\"\u003eNianJi\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/intheway\"\u003eintheway\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/ValiantCat\"\u003eValiantCat\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/jmpews\"\u003ejmpews\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0x9 Contributing\u003c/h2\u003e\u003ca id=\"user-content-0x9-contributing\" class=\"anchor\" aria-label=\"Permalink: 0x9 Contributing\" href=\"#0x9-contributing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"/alibaba/coobjc/blob/master/CONTRIBUTING.md\"\u003eContributing\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e0xA License\u003c/h2\u003e\u003ca id=\"user-content-0xa-license\" class=\"anchor\" aria-label=\"Permalink: 0xA License\" href=\"#0xa-license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ecoobjc is released under the Apache 2.0 license. See \u003ca href=\"/alibaba/coobjc/blob/master/LICENSE\"\u003eLICENSE\u003c/a\u003e for details.\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":2,"text":"0x0 iOS Asynchronous programming problem","anchor":"0x0-ios-asynchronous-programming-problem","htmlText":"0x0 iOS Asynchronous programming problem"},{"level":2,"text":"0x1 Solution","anchor":"0x1-solution","htmlText":"0x1 Solution"},{"level":2,"text":"0x2 Coroutine","anchor":"0x2-coroutine","htmlText":"0x2 Coroutine"},{"level":2,"text":"0x3 coobjc framework","anchor":"0x3-coobjc-framework","htmlText":"0x3 coobjc framework"},{"level":3,"text":"0x31 Install","anchor":"0x31-install","htmlText":"0x31 Install"},{"level":3,"text":"0x32 Documents","anchor":"0x32-documents","htmlText":"0x32 Documents"},{"level":3,"text":"0x33 Features","anchor":"0x33-features","htmlText":"0x33 Features"},{"level":4,"text":"async/await","anchor":"asyncawait","htmlText":"async/await"},{"level":4,"text":"Generator","anchor":"generator","htmlText":"Generator"},{"level":4,"text":"Actor","anchor":"actor","htmlText":"Actor"},{"level":4,"text":"tuple","anchor":"tuple","htmlText":"tuple"},{"level":4,"text":"Actual case using coobjc","anchor":"actual-case-using-coobjc","htmlText":"Actual case using coobjc"},{"level":4,"text":"Swift","anchor":"swift","htmlText":"Swift"},{"level":2,"text":"0x4 Advantages of the coroutine","anchor":"0x4-advantages-of-the-coroutine","htmlText":"0x4 Advantages of the coroutine"},{"level":2,"text":"0x5 Communication","anchor":"0x5-communication","htmlText":"0x5 Communication"},{"level":2,"text":"0x6 Unit Tests","anchor":"0x6-unit-tests","htmlText":"0x6 Unit Tests"},{"level":2,"text":"0x7 Credits","anchor":"0x7-credits","htmlText":"0x7 Credits"},{"level":2,"text":"0x8 Authors","anchor":"0x8-authors","htmlText":"0x8 Authors"},{"level":2,"text":"0x9 Contributing","anchor":"0x9-contributing","htmlText":"0x9 Contributing"},{"level":2,"text":"0xA License","anchor":"0xa-license","htmlText":"0xA License"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Falibaba%2Fcoobjc"}},{"displayName":"LICENSE","repoName":"coobjc","refName":"master","path":"LICENSE","preferredFileType":"license","tabName":"Apache-2.0","richText":null,"loaded":false,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":null,"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Falibaba%2Fcoobjc"}}],"overviewFilesProcessingTime":0}},"appPayload":{"helpUrl":"https://docs.github.com","findFileWorkerPath":"/assets-cdn/worker/find-file-worker-7d7eb7c71814.js","findInFileWorkerPath":"/assets-cdn/worker/find-in-file-worker-96e76d5fdb2c.js","githubDevUrl":null,"enabled_features":{"copilot_workspace":null,"code_nav_ui_events":false,"overview_shared_code_dropdown_button":false,"react_blob_overlay":false,"accessible_code_button":true,"github_models_repo_integration":false}}}}</script> <div data-target="react-partial.reactRoot"><style data-styled="true" 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style="vertical-align:text-bottom"><path d="M5.75 2.5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5ZM2 14a1 1 0 1 1 0-2 1 1 0 0 1 0 2Zm1-6a1 1 0 1 1-2 0 1 1 0 0 1 2 0ZM2 4a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg></button></div><div class="Box-sc-g0xbh4-0 QkQOb js-snippet-clipboard-copy-unpositioned undefined" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><p align="center" dir="auto"> <a target="_blank" rel="noopener noreferrer" href="/alibaba/coobjc/blob/master/coobjc_icon.png"><img src="/alibaba/coobjc/raw/master/coobjc_icon.png" alt="coobjc" title="coobjc" style="max-width: 100%;"></a> </p> <p dir="auto">This library provides coroutine support for Objective-C and Swift. We added await method、generator and actor model like C#、Javascript and Kotlin. For convenience, we added coroutine categories for some Foundation and UIKit API in <a href="/alibaba/coobjc/blob/master/cokit/README.md">cokit framework</a> like NSFileManager, JSON, NSData, UIImage etc. We also add tuple support in coobjc.</p> <p dir="auto"><a href="/alibaba/coobjc/blob/master/README_cn.md">cooobjc 中文文档</a></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0x0 iOS Asynchronous programming problem</h2><a id="user-content-0x0-ios-asynchronous-programming-problem" class="anchor" aria-label="Permalink: 0x0 iOS Asynchronous programming problem" href="#0x0-ios-asynchronous-programming-problem"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Block-based asynchronous programming callback is currently the most widely used asynchronous programming method for iOS. The GCD library provided by iOS system makes asynchronous development very simple and convenient, but there are many disadvantages based on this programming method：</p> <ul dir="auto"> <li> <p dir="auto">get into Callback hell</p> <p dir="auto">Sequence of simple operations is unnaturally composed in the nested blocks. This "Callback hell" makes it difficult to keep track of code that is running, and the stack of closures leads to many second order effects.</p> </li> <li> <p dir="auto">Handling errors becomes difficult and very verbose</p> </li> <li> <p dir="auto">Conditional execution is hard and error-prone</p> </li> <li> <p dir="auto">forget to call the completion block</p> </li> <li> <p dir="auto">Because completion handlers are awkward, too many APIs are defined synchronously</p> <p dir="auto">This is hard to quantify, but the authors believe that the awkwardness of defining and using asynchronous APIs (using completion handlers) has led to many APIs being defined with apparently synchronous behavior, even when they can block. This can lead to problematic performance and responsiveness problems in UI applications - e.g. spinning cursor. It can also lead to the definition of APIs that cannot be used when asynchrony is critical to achieve scale, e.g. on the server.</p> </li> <li> <p dir="auto">Multi-threaded crashes that are difficult to locate</p> </li> <li> <p dir="auto">Locks and semaphore abuse caused by blocking</p> </li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0x1 Solution</h2><a id="user-content-0x1-solution" class="anchor" aria-label="Permalink: 0x1 Solution" href="#0x1-solution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">These problem have been faced in many systems and many languages, and the abstraction of coroutines is a standard way to address them. Without delving too much into theory, coroutines are an extension of basic functions that allow a function to return a value or be suspended. They can be used to implement generators, asynchronous models, and other capabilities - there is a large body of work on the theory, implementation, and optimization of them.</p> <p dir="auto">Kotlin is a static programming language supported by JetBrains that supports modern multi-platform applications. It has been quite hot in the developer community for the past two years. In the Kotlin language, async/await based on coroutine, generator/yield and other asynchronous technologies have become syntactic standard, Kotlin coroutine related introduction, you can refer to：<a href="https://www.kotlincn.net/docs/reference/coroutines/basics.html" rel="nofollow">https://www.kotlincn.net/docs/reference/coroutines/basics.html</a></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0x2 Coroutine</h2><a id="user-content-0x2-coroutine" class="anchor" aria-label="Permalink: 0x2 Coroutine" href="#0x2-coroutine"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <blockquote> <p dir="auto"><strong>Coroutines are computer program components that generalize subroutines for non-preemptive multitasking, by allowing execution to be suspended and resumed. Coroutines are well-suited for implementing familiar program components such as cooperative tasks, exceptions, event loops, iterators, infinite lists and pipes</strong></p> </blockquote> <p dir="auto">The concept of coroutine has been proposed in the 1960s. It is widely used in the server. It is extremely suitable for use in high concurrency scenarios. It can greatly reduce the number of threads in a single machine and improve the connection and processing capabilities of a single machine. In the meantime, iOS currently does not support the use of coroutines（That's why we want to support it.）</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0x3 coobjc framework</h2><a id="user-content-0x3-coobjc-framework" class="anchor" aria-label="Permalink: 0x3 coobjc framework" href="#0x3-coobjc-framework"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">coobjc is a coroutine development framework that can be used on the iOS by the Alibaba Taobao-Mobile architecture team. Currently it supports the use of Objective-C and Swift. We use the assembly and C language for development, and the upper layer provides the interface between Objective-C and Swift. Currently, It's open source here under Apache open source license.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">0x31 Install</h3><a id="user-content-0x31-install" class="anchor" aria-label="Permalink: 0x31 Install" href="#0x31-install"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>cocoapods for objective-c: pod 'coobjc'</li> <li>cocoapods for swift: pod 'coswift'</li> <li>cocoapods for cokit: pod 'cokit'</li> <li>source code: All the code is in the ./coobjc directory</li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">0x32 Documents</h3><a id="user-content-0x32-documents" class="anchor" aria-label="Permalink: 0x32 Documents" href="#0x32-documents"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Read the <a href="/alibaba/coobjc/blob/master/docs/arch_design.md">Coroutine framework design</a> document.</li> <li>Read the <a href="/alibaba/coobjc/blob/master/docs/usage.md">coobjc Objective-C Guide</a> document.</li> <li>Read the <a href="/alibaba/coobjc/blob/master/docs/usage_swift.md">coobjc Swift Guide</a> document.</li> <li>Read the <a href="/alibaba/coobjc/blob/master/cokit/README.md">cokit framework</a> document, learn how to use the wrapper api of System Interface.</li> <li>We have provided <a href="/alibaba/coobjc/blob/master/Examples/coobjcBaseExample">coobjcBaseExample</a> demos for coobjc, <a href="/alibaba/coobjc/blob/master/Examples/coSwiftDemo">coSwiftDemo</a> for coswift, <a href="/alibaba/coobjc/blob/master/cokit/Examples/coKitExamples">coKitExamples</a> for cokit</li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">0x33 Features</h3><a id="user-content-0x33-features" class="anchor" aria-label="Permalink: 0x33 Features" href="#0x33-features"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">async/await</h4><a id="user-content-asyncawait" class="anchor" aria-label="Permalink: async/await" href="#asyncawait"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>create coroutine</li> </ul> <p dir="auto">Create a coroutine using the co_launch method</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="co_launch(^{ ... });"><pre><span class="pl-en">co_launch</span>(^{ ... });</pre></div> <p dir="auto">The coroutine created by co_launch is scheduled by default in the current thread.</p> <ul dir="auto"> <li>await asynchronous method</li> </ul> <p dir="auto">In the coroutine we use the await method to wait for the asynchronous method to execute, get the asynchronous execution result</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="- (void)viewDidLoad { ... co_launch(^{ // async downloadDataFromUrl NSData *data = await(downloadDataFromUrl(url)); // async transform data to image UIImage *image = await(imageFromData(data)); // set image to imageView self.imageView.image = image; }); }"><pre>- (<span class="pl-k">void</span>)viewDidLoad { ... <span class="pl-c1">co_launch</span>(^{ <span class="pl-c"><span class="pl-c">//</span> async downloadDataFromUrl</span> <span class="pl-c1">NSData</span> *data = <span class="pl-c1">await</span>(<span class="pl-c1">downloadDataFromUrl</span>(url)); <span class="pl-c"><span class="pl-c">//</span> async transform data to image</span> UIImage *image = <span class="pl-c1">await</span>(<span class="pl-c1">imageFromData</span>(data)); <span class="pl-c"><span class="pl-c">//</span> set image to imageView</span> self.<span class="pl-smi">imageView</span>.<span class="pl-smi">image</span> = image; }); }</pre></div> <p dir="auto">The above code turns the code that originally needs dispatch_async twice into sequential execution, and the code is more concise.</p> <ul dir="auto"> <li>error handling</li> </ul> <p dir="auto">In the coroutine, all our methods are directly returning the value, and no error is returned. Our error in the execution process is obtained by co_getError(). For example, we have the following interface to obtain data from the network. When the promise will reject: error</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="- (COPromise*)co_GET:(NSString*)url parameters:(NSDictionary*)parameters{ COPromise *promise = [COPromise promise]; [self GET:url parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) { [promise fulfill:responseObject]; } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) { [promise reject:error]; }]; return promise; }"><pre>- (COPromise*)co_GET:(<span class="pl-c1">NSString</span>*)url parameters:(<span class="pl-c1">NSDictionary</span>*)parameters{ COPromise *promise = [COPromise <span class="pl-c1">promise</span>]; [<span class="pl-c1">self</span> <span class="pl-c1">GET:</span>url <span class="pl-c1">parameters:</span>parameters <span class="pl-c1">progress:</span><span class="pl-c1">nil</span> <span class="pl-c1">success:</span>^(<span class="pl-c1">NSURLSessionDataTask</span> * _Nonnull task, <span class="pl-c1">id</span> _Nullable responseObject) { [promise <span class="pl-c1">fulfill:</span>responseObject]; } <span class="pl-c1">failure:</span>^(<span class="pl-c1">NSURLSessionDataTask</span> * _Nullable task, <span class="pl-c1">NSError</span> * _Nonnull error) { [promise <span class="pl-c1">reject:</span>error]; }]; <span class="pl-k">return</span> promise; }</pre></div> <p dir="auto">Then we can use the method in the coroutine：</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="co_launch(^{ id response = await([self co_GET:feedModel.feedUrl parameters:nil]); if(co_getError()){ //handle error message } ... });"><pre><span class="pl-en">co_launch</span>(^{ <span class="pl-c1">id</span> response = <span class="pl-c1">await</span>([<span class="pl-c1">self</span> <span class="pl-c1">co_GET:</span>feedModel.feedUrl <span class="pl-c1">parameters:</span><span class="pl-c1">nil</span>]); <span class="pl-k">if</span>(<span class="pl-c1">co_getError</span>()){ <span class="pl-c"><span class="pl-c">//</span>handle error message</span> } ... });</pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Generator</h4><a id="user-content-generator" class="anchor" aria-label="Permalink: Generator" href="#generator"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>create generator</li> </ul> <p dir="auto">We use co_sequence to create the generator</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="COCoroutine *co1 = co_sequence(^{ int index = 0; while(co_isActive()){ yield_val(@(index)); index++; } });"><pre>COCoroutine *co1 = co_sequence(^{ <span class="pl-k">int</span> <span class="pl-c1">index</span> = <span class="pl-c1">0</span>; <span class="pl-k">while</span>(<span class="pl-c1">co_isActive</span>()){ <span class="pl-c1">yield_val</span>(@(<span class="pl-c1">index</span>)); <span class="pl-c1">index</span>++; } });</pre></div> <p dir="auto">In other coroutines, we can call the next method to get the data in the generator.</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="co_launch(^{ for(int i = 0; i < 10; i++){ val = [[co1 next] intValue]; } });"><pre><span class="pl-en">co_launch</span>(^{ <span class="pl-k">for</span>(<span class="pl-k">int</span> i = <span class="pl-c1">0</span>; i < <span class="pl-c1">10</span>; i++){ val = [[co1 <span class="pl-c1">next</span>] <span class="pl-c1">intValue</span>]; } });</pre></div> <ul dir="auto"> <li>use case</li> </ul> <p dir="auto">The generator can be used in many scenarios, such as message queues, batch download files, bulk load caches, etc.:</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="int unreadMessageCount = 10; NSString *userId = @"xxx"; COSequence *messageSequence = co_sequence_onqueue(background_queue, ^{ //thread execution in the background while(1){ yield(queryOneNewMessageForUserWithId(userId)); } }); //Main thread update UI co_launch(^{ for(int i = 0; i < unreadMessageCount; i++){ if(!isQuitCurrentView()){ displayMessage([messageSequence next]); } } });"><pre><span class="pl-k">int</span> unreadMessageCount = <span class="pl-c1">10</span>; <span class="pl-c1">NSString</span> *userId = <span class="pl-s"><span class="pl-pds">@"</span>xxx<span class="pl-pds">"</span></span>; COSequence *messageSequence = co_sequence_onqueue(background_queue, ^{ <span class="pl-c"><span class="pl-c">//</span>thread execution in the background</span> <span class="pl-k">while</span>(<span class="pl-c1">1</span>){ <span class="pl-c1">yield</span>(<span class="pl-c1">queryOneNewMessageForUserWithId</span>(userId)); } }); <span class="pl-c"><span class="pl-c">//</span>Main thread update UI</span> <span class="pl-en">co_launch</span>(^{ <span class="pl-k">for</span>(<span class="pl-k">int</span> i = <span class="pl-c1">0</span>; i < unreadMessageCount; i++){ <span class="pl-k">if</span>(!<span class="pl-c1">isQuitCurrentView</span>()){ <span class="pl-c1">displayMessage</span>([messageSequence <span class="pl-c1">next</span>]); } } });</pre></div> <p dir="auto">Through the generator, we can load the data from the traditional producer--notifying the consumer model, turning the consumer into the data-->telling the producer to load the pattern, avoiding the need to use many shared variables for the state in multi-threaded computing. Synchronization eliminates the use of locks in certain scenarios.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Actor</h4><a id="user-content-actor" class="anchor" aria-label="Permalink: Actor" href="#actor"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <blockquote> <p dir="auto"><strong><em>The concept of Actor comes from Erlang. In AKKA, an Actor can be thought of as a container for storing state, behavior, Mailbox, and child Actor and Supervisor policies. Actors do not communicate directly, but use Mail to communicate with each other.</em></strong></p> </blockquote> <ul dir="auto"> <li>create actor</li> </ul> <p dir="auto">We can use co_actor_onqueue to create an actor in the specified thread.</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="COActor *actor = co_actor_onqueue(q, ^(COActorChan *channel) { ... //Define the state variable of the actor for(COActorMessage *message in channel){ ...//handle message } });"><pre>COActor *actor = co_actor_onqueue(q, ^(COActorChan *channel) { ... <span class="pl-c"><span class="pl-c">//</span>Define the state variable of the actor</span> <span class="pl-k">for</span>(COActorMessage *message in channel){ ...<span class="pl-c"><span class="pl-c">//</span>handle message</span> } });</pre></div> <ul dir="auto"> <li>send a message to the actor</li> </ul> <p dir="auto">The actor's send method can send a message to the actor</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="COActor *actor = co_actor_onqueue(q, ^(COActorChan *channel) { ... //Define the state variable of the actor for(COActorMessage *message in channel){ ...//handle message } }); // send a message to the actor [actor send:@"sadf"]; [actor send:@(1)];"><pre>COActor *actor = co_actor_onqueue(q, ^(COActorChan *channel) { ... <span class="pl-c"><span class="pl-c">//</span>Define the state variable of the actor</span> <span class="pl-k">for</span>(COActorMessage *message in channel){ ...<span class="pl-c"><span class="pl-c">//</span>handle message</span> } }); <span class="pl-c"><span class="pl-c">//</span> send a message to the actor</span> [actor <span class="pl-c1">send:</span><span class="pl-s"><span class="pl-pds">@"</span>sadf<span class="pl-pds">"</span></span>]; [actor <span class="pl-c1">send:</span>@(<span class="pl-c1">1</span>)];</pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">tuple</h4><a id="user-content-tuple" class="anchor" aria-label="Permalink: tuple" href="#tuple"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>create tuple we provide co_tuple method to create tuple</li> </ul> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="COTuple *tup = co_tuple(nil, @10, @"abc"); NSAssert(tup[0] == nil, @"tup[0] is wrong"); NSAssert([tup[1] intValue] == 10, @"tup[1] is wrong"); NSAssert([tup[2] isEqualToString:@"abc"], @"tup[2] is wrong");"><pre>COTuple *tup = co_tuple(<span class="pl-c1">nil</span>, @<span class="pl-c1">10</span>, <span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>(tup[<span class="pl-c1">0</span>] == <span class="pl-c1">nil</span>, <span class="pl-s"><span class="pl-pds">@"</span>tup[0] is wrong<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>([tup[<span class="pl-c1">1</span>] <span class="pl-c1">intValue</span>] == <span class="pl-c1">10</span>, <span class="pl-s"><span class="pl-pds">@"</span>tup[1] is wrong<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>([tup[<span class="pl-c1">2</span>] <span class="pl-c1">isEqualToString:</span><span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>], <span class="pl-s"><span class="pl-pds">@"</span>tup[2] is wrong<span class="pl-pds">"</span></span>);</pre></div> <p dir="auto">you can store any value in tuple</p> <ul dir="auto"> <li>unpack tuple we provide co_unpack method to unpack tuple</li> </ul> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="id val0; NSNumber *number = nil; NSString *str = nil; co_unpack(&val0, &number, &str) = co_tuple(nil, @10, @"abc"); NSAssert(val0 == nil, @"val0 is wrong"); NSAssert([number intValue] == 10, @"number is wrong"); NSAssert([str isEqualToString:@"abc"], @"str is wrong"); co_unpack(&val0, &number, &str) = co_tuple(nil, @10, @"abc", @10, @"abc"); NSAssert(val0 == nil, @"val0 is wrong"); NSAssert([number intValue] == 10, @"number is wrong"); NSAssert([str isEqualToString:@"abc"], @"str is wrong"); co_unpack(&val0, &number, &str, &number, &str) = co_tuple(nil, @10, @"abc"); NSAssert(val0 == nil, @"val0 is wrong"); NSAssert([number intValue] == 10, @"number is wrong"); NSAssert([str isEqualToString:@"abc"], @"str is wrong"); NSString *str1; co_unpack(nil, nil, &str1) = co_tuple(nil, @10, @"abc"); NSAssert([str1 isEqualToString:@"abc"], @"str1 is wrong");"><pre><span class="pl-c1">id</span> val0; <span class="pl-c1">NSNumber</span> *number = <span class="pl-c1">nil</span>; <span class="pl-c1">NSString</span> *str = <span class="pl-c1">nil</span>; <span class="pl-en">co_unpack</span>(&val0, &number, &str) = co_tuple(<span class="pl-c1">nil</span>, @<span class="pl-c1">10</span>, <span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>(val0 == <span class="pl-c1">nil</span>, <span class="pl-s"><span class="pl-pds">@"</span>val0 is wrong<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>([number <span class="pl-c1">intValue</span>] == <span class="pl-c1">10</span>, <span class="pl-s"><span class="pl-pds">@"</span>number is wrong<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>([str <span class="pl-c1">isEqualToString:</span><span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>], <span class="pl-s"><span class="pl-pds">@"</span>str is wrong<span class="pl-pds">"</span></span>); <span class="pl-en">co_unpack</span>(&val0, &number, &str) = co_tuple(<span class="pl-c1">nil</span>, @<span class="pl-c1">10</span>, <span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>, @<span class="pl-c1">10</span>, <span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>(val0 == <span class="pl-c1">nil</span>, <span class="pl-s"><span class="pl-pds">@"</span>val0 is wrong<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>([number <span class="pl-c1">intValue</span>] == <span class="pl-c1">10</span>, <span class="pl-s"><span class="pl-pds">@"</span>number is wrong<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>([str <span class="pl-c1">isEqualToString:</span><span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>], <span class="pl-s"><span class="pl-pds">@"</span>str is wrong<span class="pl-pds">"</span></span>); <span class="pl-en">co_unpack</span>(&val0, &number, &str, &number, &str) = co_tuple(<span class="pl-c1">nil</span>, @<span class="pl-c1">10</span>, <span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>(val0 == <span class="pl-c1">nil</span>, <span class="pl-s"><span class="pl-pds">@"</span>val0 is wrong<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>([number <span class="pl-c1">intValue</span>] == <span class="pl-c1">10</span>, <span class="pl-s"><span class="pl-pds">@"</span>number is wrong<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>([str <span class="pl-c1">isEqualToString:</span><span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>], <span class="pl-s"><span class="pl-pds">@"</span>str is wrong<span class="pl-pds">"</span></span>); <span class="pl-c1">NSString</span> *str1; <span class="pl-en">co_unpack</span>(<span class="pl-c1">nil</span>, <span class="pl-c1">nil</span>, &str1) = co_tuple(<span class="pl-c1">nil</span>, @<span class="pl-c1">10</span>, <span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>); <span class="pl-en">NSAssert</span>([str1 <span class="pl-c1">isEqualToString:</span><span class="pl-s"><span class="pl-pds">@"</span>abc<span class="pl-pds">"</span></span>], <span class="pl-s"><span class="pl-pds">@"</span>str1 is wrong<span class="pl-pds">"</span></span>);</pre></div> <ul dir="auto"> <li>use tuple in coroutine first create a promise that resolve tuple value</li> </ul> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="COPromise<COTuple*>* cotest_loadContentFromFile(NSString *filePath){ return [COPromise promise:^(COPromiseFullfill _Nonnull resolve, COPromiseReject _Nonnull reject) { if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) { NSData *data = [[NSData alloc] initWithContentsOfFile:filePath]; resolve(co_tuple(filePath, data, nil)); } else{ NSError *error = [NSError errorWithDomain:@"fileNotFound" code:-1 userInfo:nil]; resolve(co_tuple(filePath, nil, error)); } }]; }"><pre>COPromise<COTuple*>* <span class="pl-en">cotest_loadContentFromFile</span>(<span class="pl-c1">NSString</span> *filePath){ <span class="pl-k">return</span> [COPromise <span class="pl-c1">promise:</span>^(COPromiseFullfill _Nonnull resolve, COPromiseReject _Nonnull reject) { <span class="pl-k">if</span> ([[<span class="pl-c1">NSFileManager</span> <span class="pl-c1">defaultManager</span>] <span class="pl-c1">fileExistsAtPath:</span>filePath]) { <span class="pl-c1">NSData</span> *data = [[<span class="pl-c1">NSData</span> <span class="pl-c1">alloc</span>] <span class="pl-c1">initWithContentsOfFile:</span>filePath]; <span class="pl-c1">resolve</span>(<span class="pl-c1">co_tuple</span>(filePath, data, <span class="pl-c1">nil</span>)); } <span class="pl-k">else</span>{ <span class="pl-c1">NSError</span> *error = [<span class="pl-c1">NSError</span> <span class="pl-c1">errorWithDomain:</span><span class="pl-s"><span class="pl-pds">@"</span>fileNotFound<span class="pl-pds">"</span></span> <span class="pl-c1">code:</span>-<span class="pl-c1">1</span> <span class="pl-c1">userInfo:</span><span class="pl-c1">nil</span>]; <span class="pl-c1">resolve</span>(<span class="pl-c1">co_tuple</span>(filePath, <span class="pl-c1">nil</span>, error)); } }]; }</pre></div> <p dir="auto">then you can fetch the value like this:</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="co_launch(^{ NSString *tmpFilePath = nil; NSData *data = nil; NSError *error = nil; co_unpack(&tmpFilePath, &data, &error) = await(cotest_loadContentFromFile(filePath)); XCTAssert([tmpFilePath isEqualToString:filePath], @"file path is wrong"); XCTAssert(data.length > 0, @"data is wrong"); XCTAssert(error == nil, @"error is wrong"); });"><pre><span class="pl-en">co_launch</span>(^{ <span class="pl-c1">NSString</span> *tmpFilePath = <span class="pl-c1">nil</span>; <span class="pl-c1">NSData</span> *data = <span class="pl-c1">nil</span>; <span class="pl-c1">NSError</span> *error = <span class="pl-c1">nil</span>; <span class="pl-c1">co_unpack</span>(&tmpFilePath, &data, &error) = <span class="pl-c1">await</span>(<span class="pl-c1">cotest_loadContentFromFile</span>(filePath)); <span class="pl-c1">XCTAssert</span>([tmpFilePath <span class="pl-c1">isEqualToString:</span>filePath], <span class="pl-s"><span class="pl-pds">@"</span>file path is wrong<span class="pl-pds">"</span></span>); <span class="pl-c1">XCTAssert</span>(data.<span class="pl-smi">length</span> > <span class="pl-c1">0</span>, <span class="pl-s"><span class="pl-pds">@"</span>data is wrong<span class="pl-pds">"</span></span>); <span class="pl-c1">XCTAssert</span>(error == <span class="pl-c1">nil</span>, <span class="pl-s"><span class="pl-pds">@"</span>error is wrong<span class="pl-pds">"</span></span>); });</pre></div> <p dir="auto">use tuple you can get multiple values from await return</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Actual case using coobjc</h4><a id="user-content-actual-case-using-coobjc" class="anchor" aria-label="Permalink: Actual case using coobjc" href="#actual-case-using-coobjc"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Let's take the code of the Feeds stream update in the GCDFetchFeed open source project as an example to demonstrate the actual usage scenarios and advantages of the coroutine. The following is the original implementation of not using coroutine：</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="- (RACSignal *)fetchAllFeedWithModelArray:(NSMutableArray *)modelArray { @weakify(self); return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { @strongify(self); //Create a parallel queue dispatch_queue_t fetchFeedQueue = dispatch_queue_create("com.starming.fetchfeed.fetchfeed", DISPATCH_QUEUE_CONCURRENT); dispatch_group_t group = dispatch_group_create(); self.feeds = modelArray; for (int i = 0; i < modelArray.count; i++) { dispatch_group_enter(group); SMFeedModel *feedModel = modelArray[i]; feedModel.isSync = NO; [self GET:feedModel.feedUrl parameters:nil progress:nil success:^(NSURLSessionTask *task, id responseObject) { dispatch_async(fetchFeedQueue, ^{ @strongify(self); //parse feed self.feeds[i] = [self.feedStore updateFeedModelWithData:responseObject preModel:feedModel]; //save to db SMDB *db = [SMDB shareInstance]; @weakify(db); [[db insertWithFeedModel:self.feeds[i]] subscribeNext:^(NSNumber *x) { @strongify(db); SMFeedModel *model = (SMFeedModel *)self.feeds[i]; model.fid = [x integerValue]; if (model.imageUrl.length > 0) { NSString *fidStr = [x stringValue]; db.feedIcons[fidStr] = model.imageUrl; } //sendNext [subscriber sendNext:@(i)]; //Notification single completion dispatch_group_leave(group); }]; });//end dispatch async } failure:^(NSURLSessionTask *operation, NSError *error) { NSLog(@"Error: %@", error); dispatch_async(fetchFeedQueue, ^{ @strongify(self); [[[SMDB shareInstance] insertWithFeedModel:self.feeds[i]] subscribeNext:^(NSNumber *x) { SMFeedModel *model = (SMFeedModel *)self.feeds[i]; model.fid = [x integerValue]; dispatch_group_leave(group); }]; });//end dispatch async }]; }//end for //Execution event after all is completed dispatch_group_notify(group, dispatch_get_main_queue(), ^{ [subscriber sendCompleted]; }); return nil; }]; }"><pre>- (RACSignal *)fetchAllFeedWithModelArray:(<span class="pl-c1">NSMutableArray</span> *)modelArray { @<span class="pl-c1">weakify</span>(self); <span class="pl-k">return</span> [RACSignal <span class="pl-c1">createSignal:</span>^RACDisposable *(<span class="pl-k">id</span><RACSubscriber> subscriber) { @<span class="pl-c1">strongify</span>(self); <span class="pl-c"><span class="pl-c">//</span>Create a parallel queue</span> <span class="pl-c1">dispatch_queue_t</span> fetchFeedQueue = <span class="pl-c1">dispatch_queue_create</span>(<span class="pl-s"><span class="pl-pds">"</span>com.starming.fetchfeed.fetchfeed<span class="pl-pds">"</span></span>, DISPATCH_QUEUE_CONCURRENT); <span class="pl-c1">dispatch_group_t</span> group = <span class="pl-c1">dispatch_group_create</span>(); self.<span class="pl-smi">feeds</span> = modelArray; <span class="pl-k">for</span> (<span class="pl-k">int</span> i = <span class="pl-c1">0</span>; i < modelArray.<span class="pl-smi">count</span>; i++) { <span class="pl-c1">dispatch_group_enter</span>(group); SMFeedModel *feedModel = modelArray[i]; feedModel.<span class="pl-smi">isSync</span> = <span class="pl-c1">NO</span>; [<span class="pl-c1">self</span> <span class="pl-c1">GET:</span>feedModel.feedUrl <span class="pl-c1">parameters:</span><span class="pl-c1">nil</span> <span class="pl-c1">progress:</span><span class="pl-c1">nil</span> <span class="pl-c1">success:</span>^(<span class="pl-c1">NSURLSessionTask</span> *task, <span class="pl-c1">id</span> responseObject) { <span class="pl-c1">dispatch_async</span>(fetchFeedQueue, ^{ @<span class="pl-c1">strongify</span>(self); <span class="pl-c"><span class="pl-c">//</span>parse feed</span> self.<span class="pl-smi">feeds</span>[i] = [<span class="pl-c1">self</span>.feedStore <span class="pl-c1">updateFeedModelWithData:</span>responseObject <span class="pl-c1">preModel:</span>feedModel]; <span class="pl-c"><span class="pl-c">//</span>save to db</span> SMDB *db = [SMDB <span class="pl-c1">shareInstance</span>]; @<span class="pl-c1">weakify</span>(db); [[db <span class="pl-c1">insertWithFeedModel:</span><span class="pl-c1">self</span>.feeds[i]] <span class="pl-c1">subscribeNext:</span>^(<span class="pl-c1">NSNumber</span> *x) { @<span class="pl-c1">strongify</span>(db); SMFeedModel *model = (SMFeedModel *)self.<span class="pl-smi">feeds</span>[i]; model.<span class="pl-smi">fid</span> = [x <span class="pl-c1">integerValue</span>]; <span class="pl-k">if</span> (model.<span class="pl-smi">imageUrl</span>.<span class="pl-smi">length</span> > <span class="pl-c1">0</span>) { <span class="pl-c1">NSString</span> *fidStr = [x <span class="pl-c1">stringValue</span>]; db.<span class="pl-smi">feedIcons</span>[fidStr] = model.<span class="pl-smi">imageUrl</span>; } <span class="pl-c"><span class="pl-c">//</span>sendNext</span> [subscriber <span class="pl-c1">sendNext:</span>@(i)]; <span class="pl-c"><span class="pl-c">//</span>Notification single completion</span> <span class="pl-c1">dispatch_group_leave</span>(group); }]; });<span class="pl-c"><span class="pl-c">//</span>end dispatch async</span> } <span class="pl-c1">failure:</span>^(<span class="pl-c1">NSURLSessionTask</span> *operation, <span class="pl-c1">NSError</span> *error) { <span class="pl-c1">NSLog</span>(<span class="pl-s"><span class="pl-pds">@"</span>Error: <span class="pl-c1">%@</span><span class="pl-pds">"</span></span>, error); <span class="pl-c1">dispatch_async</span>(fetchFeedQueue, ^{ @<span class="pl-c1">strongify</span>(self); [[[SMDB <span class="pl-c1">shareInstance</span>] <span class="pl-c1">insertWithFeedModel:</span><span class="pl-c1">self</span>.feeds[i]] <span class="pl-c1">subscribeNext:</span>^(<span class="pl-c1">NSNumber</span> *x) { SMFeedModel *model = (SMFeedModel *)self.<span class="pl-smi">feeds</span>[i]; model.<span class="pl-smi">fid</span> = [x <span class="pl-c1">integerValue</span>]; <span class="pl-c1">dispatch_group_leave</span>(group); }]; });<span class="pl-c"><span class="pl-c">//</span>end dispatch async</span> }]; }<span class="pl-c"><span class="pl-c">//</span>end for</span> <span class="pl-c"><span class="pl-c">//</span>Execution event after all is completed</span> <span class="pl-c1">dispatch_group_notify</span>(group, <span class="pl-c1">dispatch_get_main_queue</span>(), ^{ [subscriber <span class="pl-c1">sendCompleted</span>]; }); <span class="pl-k">return</span> <span class="pl-c1">nil</span>; }]; }</pre></div> <p dir="auto">The following is the call to the above method in viewDidLoad:</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="[UIApplication sharedApplication].networkActivityIndicatorVisible = YES; self.fetchingCount = 0; @weakify(self); [[[[[[SMNetManager shareInstance] fetchAllFeedWithModelArray:self.feeds] map:^id(NSNumber *value) { @strongify(self); NSUInteger index = [value integerValue]; self.feeds[index] = [SMNetManager shareInstance].feeds[index]; return self.feeds[index]; }] doCompleted:^{ @strongify(self); NSLog(@"fetch complete"); self.tbHeaderLabel.text = @""; self.tableView.tableHeaderView = [[UIView alloc] init]; self.fetchingCount = 0; [self.tableView.mj_header endRefreshing]; [self.tableView reloadData]; if ([SMFeedStore defaultFeeds].count > self.feeds.count) { self.feeds = [SMFeedStore defaultFeeds]; [self fetchAllFeeds]; } [self cacheFeedItems]; }] deliverOn:[RACScheduler mainThreadScheduler]] subscribeNext:^(SMFeedModel *feedModel) { @strongify(self); self.tableView.tableHeaderView = self.tbHeaderView; self.fetchingCount += 1; self.tbHeaderLabel.text = [NSString stringWithFormat:@"正在获取%@...(%lu/%lu)",feedModel.title,(unsigned long)self.fetchingCount,(unsigned long)self.feeds.count]; feedModel.isSync = YES; [self.tableView reloadData]; }];"><pre>[UIApplication <span class="pl-c1">sharedApplication</span>].networkActivityIndicatorVisible = <span class="pl-c1">YES</span>; self.fetchingCount = <span class="pl-c1">0</span>; @weakify(self); [[[[[[SMNetManager <span class="pl-c1">shareInstance</span>] <span class="pl-c1">fetchAllFeedWithModelArray:</span><span class="pl-c1">self</span>.feeds] <span class="pl-c1">map:</span>^<span class="pl-c1">id</span>(<span class="pl-c1">NSNumber</span> *value) { @<span class="pl-c1">strongify</span>(self); <span class="pl-c1">NSUInteger</span> <span class="pl-c1">index</span> = [value <span class="pl-c1">integerValue</span>]; self.<span class="pl-smi">feeds</span>[<span class="pl-c1">index</span>] = [SMNetManager <span class="pl-c1">shareInstance</span>].<span class="pl-smi">feeds</span>[<span class="pl-c1">index</span>]; <span class="pl-k">return</span> self.<span class="pl-smi">feeds</span>[<span class="pl-c1">index</span>]; }] <span class="pl-c1">doCompleted:</span>^{ @<span class="pl-c1">strongify</span>(self); <span class="pl-c1">NSLog</span>(<span class="pl-s"><span class="pl-pds">@"</span>fetch complete<span class="pl-pds">"</span></span>); self.<span class="pl-smi">tbHeaderLabel</span>.<span class="pl-smi">text</span> = <span class="pl-s"><span class="pl-pds">@"</span><span class="pl-pds">"</span></span>; self.<span class="pl-smi">tableView</span>.<span class="pl-smi">tableHeaderView</span> = [[UIView <span class="pl-c1">alloc</span>] <span class="pl-c1">init</span>]; self.<span class="pl-smi">fetchingCount</span> = <span class="pl-c1">0</span>; [<span class="pl-c1">self</span>.tableView.mj_header <span class="pl-c1">endRefreshing</span>]; [<span class="pl-c1">self</span>.tableView <span class="pl-c1">reloadData</span>]; <span class="pl-k">if</span> ([SMFeedStore <span class="pl-c1">defaultFeeds</span>].<span class="pl-smi">count</span> > self.<span class="pl-smi">feeds</span>.<span class="pl-smi">count</span>) { self.<span class="pl-smi">feeds</span> = [SMFeedStore <span class="pl-c1">defaultFeeds</span>]; [<span class="pl-c1">self</span> <span class="pl-c1">fetchAllFeeds</span>]; } [<span class="pl-c1">self</span> <span class="pl-c1">cacheFeedItems</span>]; }] <span class="pl-c1">deliverOn:</span>[RACScheduler <span class="pl-c1">mainThreadScheduler</span>]] <span class="pl-c1">subscribeNext:</span>^(SMFeedModel *feedModel) { @<span class="pl-c1">strongify</span>(self); self.<span class="pl-smi">tableView</span>.<span class="pl-smi">tableHeaderView</span> = self.<span class="pl-smi">tbHeaderView</span>; self.<span class="pl-smi">fetchingCount</span> += <span class="pl-c1">1</span>; self.<span class="pl-smi">tbHeaderLabel</span>.<span class="pl-smi">text</span> = [<span class="pl-c1">NSString</span> <span class="pl-c1">stringWithFormat:</span><span class="pl-s"><span class="pl-pds">@"</span>正在获取<span class="pl-c1">%@</span>...(<span class="pl-c1">%lu</span>/<span class="pl-c1">%lu</span>)<span class="pl-pds">"</span></span>,feedModel.title,(<span class="pl-k">unsigned</span> <span class="pl-k">long</span>)<span class="pl-c1">self</span>.fetchingCount,(<span class="pl-k">unsigned</span> <span class="pl-k">long</span>)<span class="pl-c1">self</span>.feeds.count]; feedModel.<span class="pl-smi">isSync</span> = <span class="pl-c1">YES</span>; [<span class="pl-c1">self</span>.tableView <span class="pl-c1">reloadData</span>]; }];</pre></div> <p dir="auto">The above code is relatively poor in terms of readability and simplicity. Let's take a look at the code after using the coroutine transformation:</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="- (SMFeedModel*)co_fetchFeedModelWithUrl:(SMFeedModel*)feedModel{ feedModel.isSync = NO; id response = await([self co_GET:feedModel.feedUrl parameters:nil]); if (response) { SMFeedModel *resultModel = await([self co_updateFeedModelWithData:response preModel:feedModel]); int fid = [[SMDB shareInstance] co_insertWithFeedModel:resultModel]; resultModel.fid = fid; if (resultModel.imageUrl.length > 0) { NSString *fidStr = [@(fid) stringValue]; [SMDB shareInstance].feedIcons[fidStr] = resultModel.imageUrl; } return resultModel; } int fid = [[SMDB shareInstance] co_insertWithFeedModel:feedModel]; feedModel.fid = fid; return nil; }"><pre>- (SMFeedModel*)co_fetchFeedModelWithUrl:(SMFeedModel*)feedModel{ feedModel.<span class="pl-smi">isSync</span> = <span class="pl-c1">NO</span>; <span class="pl-c1">id</span> response = <span class="pl-c1">await</span>([<span class="pl-c1">self</span> <span class="pl-c1">co_GET:</span>feedModel.feedUrl <span class="pl-c1">parameters:</span><span class="pl-c1">nil</span>]); <span class="pl-k">if</span> (response) { SMFeedModel *resultModel = <span class="pl-c1">await</span>([<span class="pl-c1">self</span> <span class="pl-c1">co_updateFeedModelWithData:</span>response <span class="pl-c1">preModel:</span>feedModel]); <span class="pl-k">int</span> fid = [[SMDB <span class="pl-c1">shareInstance</span>] <span class="pl-c1">co_insertWithFeedModel:</span>resultModel]; resultModel.<span class="pl-smi">fid</span> = fid; <span class="pl-k">if</span> (resultModel.<span class="pl-smi">imageUrl</span>.<span class="pl-smi">length</span> > <span class="pl-c1">0</span>) { <span class="pl-c1">NSString</span> *fidStr = [@(fid) <span class="pl-c1">stringValue</span>]; [SMDB <span class="pl-c1">shareInstance</span>].<span class="pl-smi">feedIcons</span>[fidStr] = resultModel.<span class="pl-smi">imageUrl</span>; } <span class="pl-k">return</span> resultModel; } <span class="pl-k">int</span> fid = [[SMDB <span class="pl-c1">shareInstance</span>] <span class="pl-c1">co_insertWithFeedModel:</span>feedModel]; feedModel.<span class="pl-smi">fid</span> = fid; <span class="pl-k">return</span> <span class="pl-c1">nil</span>; }</pre></div> <p dir="auto">Here is the place in viewDidLoad that uses the coroutine to call the interface:</p> <div class="highlight highlight-source-objc notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="co_launch(^{ for (NSUInteger index = 0; index < self.feeds.count; index++) { SMFeedModel *model = self.feeds[index]; self.tableView.tableHeaderView = self.tbHeaderView; self.tbHeaderLabel.text = [NSString stringWithFormat:@"正在获取%@...(%lu/%lu)",model.title,(unsigned long)(index + 1),(unsigned long)self.feeds.count]; model.isSync = YES; SMFeedModel *resultMode = [[SMNetManager shareInstance] co_fetchFeedModelWithUrl:model]; if (resultMode) { self.feeds[index] = resultMode; [self.tableView reloadData]; } } self.tbHeaderLabel.text = @""; self.tableView.tableHeaderView = [[UIView alloc] init]; self.fetchingCount = 0; [self.tableView.mj_header endRefreshing]; [self.tableView reloadData]; [self cacheFeedItems]; });"><pre><span class="pl-en">co_launch</span>(^{ <span class="pl-k">for</span> (<span class="pl-c1">NSUInteger</span> <span class="pl-c1">index</span> = <span class="pl-c1">0</span>; <span class="pl-c1">index</span> < self.<span class="pl-smi">feeds</span>.<span class="pl-smi">count</span>; <span class="pl-c1">index</span>++) { SMFeedModel *model = self.<span class="pl-smi">feeds</span>[<span class="pl-c1">index</span>]; self.<span class="pl-smi">tableView</span>.<span class="pl-smi">tableHeaderView</span> = self.<span class="pl-smi">tbHeaderView</span>; self.<span class="pl-smi">tbHeaderLabel</span>.<span class="pl-smi">text</span> = [<span class="pl-c1">NSString</span> <span class="pl-c1">stringWithFormat:</span><span class="pl-s"><span class="pl-pds">@"</span>正在获取<span class="pl-c1">%@</span>...(<span class="pl-c1">%lu</span>/<span class="pl-c1">%lu</span>)<span class="pl-pds">"</span></span>,model.title,(<span class="pl-k">unsigned</span> <span class="pl-k">long</span>)(<span class="pl-c1">index</span> + <span class="pl-c1">1</span>),(<span class="pl-k">unsigned</span> <span class="pl-k">long</span>)<span class="pl-c1">self</span>.feeds.count]; model.<span class="pl-smi">isSync</span> = <span class="pl-c1">YES</span>; SMFeedModel *resultMode = [[SMNetManager <span class="pl-c1">shareInstance</span>] <span class="pl-c1">co_fetchFeedModelWithUrl:</span>model]; <span class="pl-k">if</span> (resultMode) { self.<span class="pl-smi">feeds</span>[<span class="pl-c1">index</span>] = resultMode; [<span class="pl-c1">self</span>.tableView <span class="pl-c1">reloadData</span>]; } } self.<span class="pl-smi">tbHeaderLabel</span>.<span class="pl-smi">text</span> = <span class="pl-s"><span class="pl-pds">@"</span><span class="pl-pds">"</span></span>; self.<span class="pl-smi">tableView</span>.<span class="pl-smi">tableHeaderView</span> = [[UIView <span class="pl-c1">alloc</span>] <span class="pl-c1">init</span>]; self.<span class="pl-smi">fetchingCount</span> = <span class="pl-c1">0</span>; [<span class="pl-c1">self</span>.tableView.mj_header <span class="pl-c1">endRefreshing</span>]; [<span class="pl-c1">self</span>.tableView <span class="pl-c1">reloadData</span>]; [<span class="pl-c1">self</span> <span class="pl-c1">cacheFeedItems</span>]; });</pre></div> <p dir="auto">The code after the coroutine transformation has become easier to understand and less error-prone.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Swift</h4><a id="user-content-swift" class="anchor" aria-label="Permalink: Swift" href="#swift"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">coobjc fully supports Swift through top-level encapsulation, enabling us to enjoy the coroutine ahead of time in Swift. Because Swift has richer and more advanced syntax support, coobjc is more elegant in Swift, for example:</p> <div class="highlight highlight-source-swift notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="func test() { co_launch {//create coroutine //fetch data asynchronous let resultStr = try await(channel: co_fetchSomething()) print("result: \(resultStr)") } co_launch {//create coroutine //fetch data asynchronous let result = try await(promise: co_fetchSomethingAsynchronous()) switch result { case .fulfilled(let data): print("data: \(String(describing: data))") break case .rejected(let error): print("error: \(error)") } } }"><pre><span class="pl-en">func</span> test<span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-en">co_launch</span> <span class="pl-kos">{</span>//create coroutine //fetch data asynchronous <span class="pl-k">let</span> <span class="pl-s1">resultStr</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span><span class="pl-kos">(</span>channel<span class="pl-kos">:</span> <span class="pl-en">co_fetchSomething</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-en">print</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">result: </span><span class="pl-kos">\(</span>resultStr<span class="pl-kos">)</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-en">co_launch</span> <span class="pl-kos">{</span>//create coroutine //fetch data asynchronous <span class="pl-k">let</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-c1"><span class="pl-k">try</span></span> <span class="pl-k">await</span><span class="pl-kos">(</span>promise<span class="pl-kos">:</span> <span class="pl-en">co_fetchSomethingAsynchronous</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-k">switch</span> result <span class="pl-kos">{</span> <span class="pl-k">case</span> <span class="pl-kos">.</span>fulfilled<span class="pl-kos">(</span><span class="pl-s1"><span class="pl-k">let</span> data</span><span class="pl-kos">)</span><span class="pl-kos">:</span> <span class="pl-en">print</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">data: </span><span class="pl-kos">\(</span><span class="pl-en">String</span><span class="pl-kos">(</span>describing<span class="pl-kos">:</span> data<span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-k">break</span> <span class="pl-k">case</span> <span class="pl-kos">.</span>rejected<span class="pl-kos">(</span><span class="pl-s1"><span class="pl-k">let</span> error</span><span class="pl-kos">)</span><span class="pl-kos">:</span> <span class="pl-en">print</span><span class="pl-kos">(</span><span class="pl-s">"</span><span class="pl-s">error: </span><span class="pl-kos">\(</span>error<span class="pl-kos">)</span><span class="pl-s">"</span><span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0x4 Advantages of the coroutine</h2><a id="user-content-0x4-advantages-of-the-coroutine" class="anchor" aria-label="Permalink: 0x4 Advantages of the coroutine" href="#0x4-advantages-of-the-coroutine"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Concise <ul dir="auto"> <li>Less concept: there are only a few operators, compared to dozens of operators in response, it can't be simpler.</li> <li>The principle is simple: the implementation principle of the coroutine is very simple, the entire coroutine library has only a few thousand lines of code</li> </ul> </li> <li>Easy to use <ul dir="auto"> <li>Simple to use: it is easier to use than GCD, with few interfaces</li> <li>Easy to retrofit: existing code can be corouted with only a few changes, and we have a large number of coroutine interfaces for the system library.</li> </ul> </li> <li>Clear <ul dir="auto"> <li>Synchronous write asynchronous logic: Synchronous sequential way of writing code is the most acceptable way for humans, which can greatly reduce the probability of error</li> <li>High readability: Code written in coroutine mode is much more readable than block nested code</li> </ul> </li> <li>High performance <ul dir="auto"> <li>Faster scheduling performance: The coroutine itself does not need to switch between kernel-level threads, scheduling performance is fast, Even if you create tens of thousands of coroutines, there is no pressure.</li> <li>Reduce app block: The use of coroutines to help reduce the abuse of locks and semaphores, and to reduce the number of stalls and jams from the root cause by encapsulating the coroutine interfaces such as IOs that cause blocking, and improve the overall performance of the application.</li> </ul> </li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0x5 Communication</h2><a id="user-content-0x5-communication" class="anchor" aria-label="Permalink: 0x5 Communication" href="#0x5-communication"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>If you <strong>need help</strong>, use <a href="http://stackoverflow.com/questions/tagged/coobjc" rel="nofollow">Stack Overflow</a>. (Tag 'coobjc')</li> <li>If you'd like to <strong>ask a general question</strong>, use <a href="http://stackoverflow.com/questions/tagged/coobjc" rel="nofollow">Stack Overflow</a>.</li> <li>If you <strong>found a bug</strong>, <em>and can provide steps to reliably reproduce it</em>, open an issue.</li> <li>If you <strong>have a feature request</strong>, open an issue.</li> <li>If you <strong>want to contribute</strong>, submit a pull request.</li> <li>If you are interested in <strong>joining Alibaba Taobao-Mobile architecture team</strong>, please send your resume to <a href="mailto:junzhan.yzw@taobao.com">junzhan</a></li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0x6 Unit Tests</h2><a id="user-content-0x6-unit-tests" class="anchor" aria-label="Permalink: 0x6 Unit Tests" href="#0x6-unit-tests"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">coobjc includes a suite of unit tests within the Tests subdirectory. These tests can be run simply be executed the test action on the platform framework you would like to test. You can find coobjc's unit tests in Examples/coobjcBaseExample/coobjcBaseExampleTests. You can find cokit's unit tests in cokit/Examples/coKitExamples/coKitExamplesTests.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0x7 Credits</h2><a id="user-content-0x7-credits" class="anchor" aria-label="Permalink: 0x7 Credits" href="#0x7-credits"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">coobjc couldn't exist without:</p> <ul dir="auto"> <li><a href="https://github.com/google/promises">Promises</a> - Google's Objective-C and Swift Promises framework.</li> <li><a href="https://swtch.com/libtask/" rel="nofollow">libtask</a> - A simple coroutine library.</li> <li><a href="https://github.com/KMindeguia/movies">movies</a> - a ios demo app, we use the code in coobjc examples</li> <li><a href="https://github.com/singro/v2ex">v2ex</a> - An iOS client for v2ex.com, we use the code in coobjc examples</li> <li><a href="https://github.com/atg/tuples">tuples</a> - Objective-C tuples.</li> <li><a href="https://github.com/facebook/fishhook">fishhook</a> - Rebinding symbols in Mach-O binaries</li> <li><a href="https://github.com/comyar/Sol">Sol</a> - Sol° beautifully displays weather information so you can plan your day accordingly. Check the weather in your current location or any city around the world. Implemented in Objective-C.</li> <li><a href="https://github.com/apple/swift">Swift</a> - The Swift Programming Language</li> <li><a href="https://github.com/apple/swift-corelibs-libdispatch">libdispatch</a> - The libdispatch Project, (a.k.a. Grand Central Dispatch), for concurrency on multicore hardware</li> <li><a href="https://opensource.apple.com/source/objc4/objc4-750.1/" rel="nofollow">objc4</a> - apple objc framework</li> <li><a href="https://blog.csdn.net/qq910894904/article/details/41911175" rel="nofollow">https://blog.csdn.net/qq910894904/article/details/41911175</a></li> <li><a href="http://www.voidcn.com/article/p-fwlohnnc-gc.html" rel="nofollow">http://www.voidcn.com/article/p-fwlohnnc-gc.html</a></li> <li><a href="https://blog.csdn.net/shenlei19911210/article/details/61194617" rel="nofollow">https://blog.csdn.net/shenlei19911210/article/details/61194617</a></li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0x8 Authors</h2><a id="user-content-0x8-authors" class="anchor" aria-label="Permalink: 0x8 Authors" href="#0x8-authors"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="https://github.com/pengyutang125">pengyutang125</a></li> <li><a href="https://github.com/NianJi">NianJi</a></li> <li><a href="https://github.com/intheway">intheway</a></li> <li><a href="https://github.com/ValiantCat">ValiantCat</a></li> <li><a href="https://github.com/jmpews">jmpews</a></li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0x9 Contributing</h2><a id="user-content-0x9-contributing" class="anchor" aria-label="Permalink: 0x9 Contributing" href="#0x9-contributing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="/alibaba/coobjc/blob/master/CONTRIBUTING.md">Contributing</a></li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">0xA License</h2><a id="user-content-0xa-license" class="anchor" aria-label="Permalink: 0xA License" href="#0xa-license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">coobjc is released under the Apache 2.0 license. See <a href="/alibaba/coobjc/blob/master/LICENSE">LICENSE</a> for details.</p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="nXYRJ99sL8rkEtI1kpELM0CvL7rPtiF1BLkZBL4RuEYx/Kbg1qpvl+zh0XgcImd3xBniNf7vTEcBhndbiQwFoQ==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> coobjc provides coroutine support for Objective-C and Swift. We added await method、generator and actor model like C#、Javascript and Kotlin. For convenience, we added coroutine categories for some Foundation and UIKit API in cokit framework like NSFileManager, JSON, NSData, UIImage etc. We also add tuple support in coobjc. </p> <div class="my-3 d-flex flex-items-center"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link flex-shrink-0 mr-2"> <path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path> </svg> <span class="flex-auto min-width-0 css-truncate css-truncate-target width-fit"> <a title="https://github.com/alibaba/coobjc" role="link" target="_blank" rel="noopener noreferrer nofollow" class="text-bold" href="https://github.com/alibaba/coobjc">github.com/alibaba/coobjc</a> </span> </div> <h3 class="sr-only">Topics</h3> <div class="my-3"> <div class="f6"> <a href="/topics/c" title="Topic: c" data-view-component="true" class="topic-tag topic-tag-link"> c </a> <a href="/topics/swift" title="Topic: swift" data-view-component="true" class="topic-tag topic-tag-link"> swift </a> <a href="/topics/ios" title="Topic: ios" data-view-component="true" class="topic-tag topic-tag-link"> ios </a> <a href="/topics/generator" title="Topic: generator" data-view-component="true" class="topic-tag topic-tag-link"> generator </a> <a href="/topics/objective-c" title="Topic: objective-c" data-view-component="true" class="topic-tag topic-tag-link"> objective-c </a> <a href="/topics/actor-model" title="Topic: actor-model" data-view-component="true" class="topic-tag topic-tag-link"> actor-model </a> <a href="/topics/asm" title="Topic: asm" data-view-component="true" class="topic-tag topic-tag-link"> asm </a> <a href="/topics/actor" title="Topic: actor" data-view-component="true" class="topic-tag topic-tag-link"> actor </a> <a href="/topics/await" title="Topic: await" data-view-component="true" class="topic-tag topic-tag-link"> await </a> <a href="/topics/arm64" title="Topic: arm64" data-view-component="true" class="topic-tag topic-tag-link"> arm64 </a> <a href="/topics/objc" title="Topic: objc" data-view-component="true" class="topic-tag topic-tag-link"> objc </a> <a href="/topics/coroutine-library" title="Topic: coroutine-library" data-view-component="true" class="topic-tag topic-tag-link"> coroutine-library </a> <a href="/topics/coroutine" title="Topic: coroutine" data-view-component="true" class="topic-tag topic-tag-link"> coroutine </a> <a href="/topics/tuple" title="Topic: tuple" data-view-component="true" class="topic-tag topic-tag-link"> tuple </a> <a href="/topics/await-promises" title="Topic: await-promises" data-view-component="true" class="topic-tag topic-tag-link"> await-promises </a> </div> </div> <h3 class="sr-only">Resources</h3> <div class="mt-2"> <a class="Link--muted" data-analytics-event="{"category":"Repository Overview","action":"click","label":"location:sidebar;file:readme"}" href="#readme-ov-file"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-book mr-2"> <path d="M0 1.75A.75.75 0 0 1 .75 1h4.253c1.227 0 2.317.59 3 1.501A3.743 3.743 0 0 1 11.006 1h4.245a.75.75 0 0 1 .75.75v10.5a.75.75 0 0 1-.75.75h-4.507a2.25 2.25 0 0 0-1.591.659l-.622.621a.75.75 0 0 1-1.06 0l-.622-.621A2.25 2.25 0 0 0 5.258 13H.75a.75.75 0 0 1-.75-.75Zm7.251 10.324.004-5.073-.002-2.253A2.25 2.25 0 0 0 5.003 2.5H1.5v9h3.757a3.75 3.75 0 0 1 1.994.574ZM8.755 4.75l-.004 7.322a3.752 3.752 0 0 1 1.992-.572H14.5v-9h-3.495a2.25 2.25 0 0 0-2.25 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0-.124.033l-1.289.737c-.265.15-.564.23-.869.23h-.162l2.112 4.692a.75.75 0 0 1-.154.838l-.53-.53.529.531-.001.002-.002.002-.006.006-.016.015-.045.04c-.21.176-.441.327-.686.45C4.556 10.78 3.88 11 3 11a4.498 4.498 0 0 1-2.023-.454 3.544 3.544 0 0 1-.686-.45l-.045-.04-.016-.015-.006-.006-.004-.004v-.001a.75.75 0 0 1-.154-.838L2.178 4.5H1.75a.75.75 0 0 1 0-1.5h2.234a.249.249 0 0 0 .125-.033l1.288-.737c.265-.15.564-.23.869-.23h.984V.75a.75.75 0 0 1 1.5 0Zm2.945 8.477c.285.135.718.273 1.305.273s1.02-.138 1.305-.273L13 6.327Zm-10 0c.285.135.718.273 1.305.273s1.02-.138 1.305-.273L3 6.327Z"></path> </svg> Apache-2.0 license </a> </div> <include-fragment src="/alibaba/coobjc/hovercards/citation/sidebar_partial?tree_name=master"> </include-fragment> <div class="mt-2"> <a href="/alibaba/coobjc/activity" data-view-component="true" class="Link Link--muted"><svg text="gray" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon 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class="color-fg-muted">Custom properties</span></a> </div> <h3 class="sr-only">Stars</h3> <div class="mt-2"> <a href="/alibaba/coobjc/stargazers" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-star mr-2"> <path d="M8 .25a.75.75 0 0 1 .673.418l1.882 3.815 4.21.612a.75.75 0 0 1 .416 1.279l-3.046 2.97.719 4.192a.751.751 0 0 1-1.088.791L8 12.347l-3.766 1.98a.75.75 0 0 1-1.088-.79l.72-4.194L.818 6.374a.75.75 0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg> <strong>4k</strong> stars</a> </div> <h3 class="sr-only">Watchers</h3> <div class="mt-2"> <a href="/alibaba/coobjc/watchers" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-eye mr-2"> <path d="M8 2c1.981 0 3.671.992 4.933 2.078 1.27 1.091 2.187 2.345 2.637 3.023a1.62 1.62 0 0 1 0 1.798c-.45.678-1.367 1.932-2.637 3.023C11.67 13.008 9.981 14 8 14c-1.981 0-3.671-.992-4.933-2.078C1.797 10.83.88 9.576.43 8.898a1.62 1.62 0 0 1 0-1.798c.45-.677 1.367-1.931 2.637-3.022C4.33 2.992 6.019 2 8 2ZM1.679 7.932a.12.12 0 0 0 0 .136c.411.622 1.241 1.75 2.366 2.717C5.176 11.758 6.527 12.5 8 12.5c1.473 0 2.825-.742 3.955-1.715 1.124-.967 1.954-2.096 2.366-2.717a.12.12 0 0 0 0-.136c-.412-.621-1.242-1.75-2.366-2.717C10.824 4.242 9.473 3.5 8 3.5c-1.473 0-2.825.742-3.955 1.715-1.124.967-1.954 2.096-2.366 2.717ZM8 10a2 2 0 1 1-.001-3.999A2 2 0 0 1 8 10Z"></path> </svg> <strong>97</strong> watching</a> </div> <h3 class="sr-only">Forks</h3> <div class="mt-2"> <a href="/alibaba/coobjc/forks" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg> <strong>522</strong> forks</a> </div> <div class="mt-2"> <a class="Link--muted" href="/contact/report-content?content_url=https%3A%2F%2Fgithub.com%2Falibaba%2Fcoobjc&report=alibaba+%28user%29"> Report repository </a> </div> </div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame"> <a href="/alibaba/coobjc/releases" 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itemprop="keywords" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> </span></div> <ul class="list-style-none"> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/alibaba/coobjc/search?l=objective-c" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#438eff;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Objective-C</span> <span>83.7%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/alibaba/coobjc/search?l=swift" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#F05138;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Swift</span> <span>6.3%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/alibaba/coobjc/search?l=objective-c%2B%2B" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#6866fb;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Objective-C++</span> <span>4.0%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/alibaba/coobjc/search?l=c" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#555555;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">C</span> <span>3.8%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/alibaba/coobjc/search?l=assembly" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#6E4C13;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Assembly</span> <span>1.5%</span> </a> </li> <li 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