Access Google APIs in an iOS app | Authentication

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Authentication" track-name="authentication" > Authentication </a> <a href="#" role="button" aria-haspopup="true" aria-expanded="false" aria-label="Dropdown menu for Authentication" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/authentication" track-metadata-position="nav - authentication" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Authentication" track-name="authentication" class="devsite-tabs-dropdown-toggle devsite-icon devsite-icon-arrow-drop-down"></a> <div class="devsite-tabs-dropdown" aria-label="submenu" hidden> <div class="devsite-tabs-dropdown-content"> <div class="devsite-tabs-dropdown-column "> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Sign In with Google SDKs</li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/android-credential-manager" track-type="nav" 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track-metadata-position="nav - authentication" track-metadata-module="tertiary nav" track-metadata-module_headline="sign in with google sdks" tooltip > <div class="devsite-nav-item-title"> Google Sign-In for iOS and macOS </div> </a> </li> </ul> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Industry standards</li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/passkeys" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/passkeys" track-metadata-position="nav - authentication" track-metadata-module="tertiary nav" track-metadata-module_headline="sign in with google sdks" tooltip > <div class="devsite-nav-item-title"> Passkeys </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/openid-connect/openid-connect" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/openid-connect/openid-connect" track-metadata-position="nav - authentication" track-metadata-module="tertiary nav" track-metadata-module_headline="sign in with google sdks" tooltip > <div class="devsite-nav-item-title"> OpenID Connect </div> </a> </li> </ul> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Legacy Sign In</li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/one-tap/android/overview" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/one-tap/android/overview" track-metadata-position="nav - authentication" track-metadata-module="tertiary nav" track-metadata-module_headline="sign in with google sdks" tooltip > <div class="devsite-nav-item-title"> One Tap sign-up/sign-in for Android </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/sign-in/android/legacy-start-integrating" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/sign-in/android/legacy-start-integrating" track-metadata-position="nav - authentication" track-metadata-module="tertiary nav" track-metadata-module_headline="sign in with google sdks" tooltip > <div class="devsite-nav-item-title"> Google Sign-In for Android </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/sign-in/web/sign-in" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/sign-in/web/sign-in" track-metadata-position="nav - authentication" track-metadata-module="tertiary nav" track-metadata-module_headline="sign in with google sdks" tooltip > <div class="devsite-nav-item-title"> Google Sign-In for Web </div> </a> </li> </ul> </div> </div> </div> </tab> <tab class="devsite-dropdown "> <a href="https://developers.google.com/identity/authorization" track-metadata-eventdetail="https://developers.google.com/identity/authorization" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - authorization" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Authorization" track-name="authorization" > Authorization </a> <a href="#" role="button" aria-haspopup="true" aria-expanded="false" aria-label="Dropdown menu for Authorization" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/authorization" track-metadata-position="nav - authorization" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Authorization" track-name="authorization" class="devsite-tabs-dropdown-toggle devsite-icon devsite-icon-arrow-drop-down"></a> <div class="devsite-tabs-dropdown" aria-label="submenu" hidden> <div class="devsite-tabs-dropdown-content"> <div class="devsite-tabs-dropdown-column "> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Call Google APIs</li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/sign-in/android/authorize-access" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/sign-in/android/authorize-access" track-metadata-position="nav - authorization" track-metadata-module="tertiary nav" track-metadata-module_headline="call google apis" tooltip > <div class="devsite-nav-item-title"> Authorizing for Android </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/oauth2/web/guides/overview" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/oauth2/web/guides/overview" track-metadata-position="nav - authorization" track-metadata-module="tertiary nav" track-metadata-module_headline="call google apis" tooltip > <div class="devsite-nav-item-title"> Authorizing for Web </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/sign-in/ios/api-access" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/sign-in/ios/api-access" track-metadata-position="nav - authorization" track-metadata-module="tertiary nav" track-metadata-module_headline="call google apis" tooltip > <div class="devsite-nav-item-title"> Authorizing for iOS/macOS </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/protocols/oauth2" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/protocols/oauth2" track-metadata-position="nav - authorization" track-metadata-module="tertiary nav" track-metadata-module_headline="call google apis" tooltip > <div class="devsite-nav-item-title"> Using OAuth 2.0 </div> </a> </li> </ul> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Share data with Google apps and devices</li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/account-linking" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/account-linking" track-metadata-position="nav - authorization" track-metadata-module="tertiary nav" track-metadata-module_headline="call google apis" tooltip > <div class="devsite-nav-item-title"> Google Account Linking </div> </a> </li> </ul> </div> </div> </div> </tab> <tab class="devsite-dropdown "> <a href="https://developers.google.com/identity/credential-management" track-metadata-eventdetail="https://developers.google.com/identity/credential-management" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - credential management" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Credential management" track-name="credential management" > Credential management </a> <a href="#" role="button" aria-haspopup="true" aria-expanded="false" aria-label="Dropdown menu for Credential management" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/credential-management" track-metadata-position="nav - credential management" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Credential management" track-name="credential management" class="devsite-tabs-dropdown-toggle devsite-icon devsite-icon-arrow-drop-down"></a> <div class="devsite-tabs-dropdown" aria-label="submenu" hidden> <div class="devsite-tabs-dropdown-content"> <div class="devsite-tabs-dropdown-column "> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Android</li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/android-credential-manager" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/android-credential-manager" track-metadata-position="nav - credential management" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Credential Manager </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/blockstore/android" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/blockstore/android" track-metadata-position="nav - credential management" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Blockstore </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/smartlock-passwords/android/associate-apps-and-sites" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/smartlock-passwords/android/associate-apps-and-sites" track-metadata-position="nav - credential management" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Digital Asset Links </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developer.android.com/guide/topics/text/autofill" track-type="nav" track-metadata-eventdetail="https://developer.android.com/guide/topics/text/autofill" track-metadata-position="nav - credential management" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Android autofill framework </div> </a> </li> </ul> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Web</li> <li class="devsite-nav-item"> <a href="https://web.dev/sign-in-form-best-practices/" track-type="nav" track-metadata-eventdetail="https://web.dev/sign-in-form-best-practices/" track-metadata-position="nav - credential management" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Autocomplete </div> </a> </li> </ul> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Cross-platform</li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/credential-sharing" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/credential-sharing" track-metadata-position="nav - credential management" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Seamless credential sharing </div> </a> </li> </ul> </div> </div> </div> </tab> <tab class="devsite-dropdown "> <a href="https://developers.google.com/identity/credential-verification" track-metadata-eventdetail="https://developers.google.com/identity/credential-verification" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - credential verification" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Credential verification" track-name="credential verification" > Credential verification </a> <a href="#" role="button" aria-haspopup="true" aria-expanded="false" aria-label="Dropdown menu for Credential verification" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/credential-verification" track-metadata-position="nav - credential verification" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Credential verification" track-name="credential verification" class="devsite-tabs-dropdown-toggle devsite-icon devsite-icon-arrow-drop-down"></a> <div class="devsite-tabs-dropdown" aria-label="submenu" hidden> <div class="devsite-tabs-dropdown-content"> <div class="devsite-tabs-dropdown-column "> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Android</li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/sms-retriever/overview" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/sms-retriever/overview" track-metadata-position="nav - credential verification" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Verify users by SMS </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/phone-number-hint/android" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/phone-number-hint/android" track-metadata-position="nav - credential verification" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Phone Number Hint </div> </a> </li> </ul> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Web</li> <li class="devsite-nav-item"> <a href="https://web.dev/web-otp/" track-type="nav" track-metadata-eventdetail="https://web.dev/web-otp/" track-metadata-position="nav - credential verification" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Verify phone numbers on the web </div> </a> </li> </ul> </div> </div> </div> </tab> </nav> </devsite-tabs> </div> <devsite-search enable-signin enable-search enable-suggestions enable-query-completion project-name="Authentication" tenant-name="Google for Developers" project-scope="/identity/authentication" url-scoped="https://developers.google.com/s/results/identity/authentication" > <form class="devsite-search-form" action="https://developers.google.com/s/results" method="GET"> <div class="devsite-search-container"> <button type="button" search-open class="devsite-search-button devsite-header-icon-button button-flat material-icons" aria-label="Open search"></button> <div class="devsite-searchbox"> <input aria-activedescendant="" aria-autocomplete="list" aria-label="Search" aria-expanded="false" aria-haspopup="listbox" autocomplete="off" class="devsite-search-field devsite-search-query" name="q" placeholder="Search" role="combobox" type="text" value="" > <div class="devsite-search-image material-icons" aria-hidden="true"> </div> <div class="devsite-search-shortcut-icon-container" aria-hidden="true"> <kbd class="devsite-search-shortcut-icon">/</kbd> </div> </div> </div> </form> <button type="button" search-close class="devsite-search-button devsite-header-icon-button button-flat material-icons" aria-label="Close search"></button> </devsite-search> </div> <devsite-language-selector> <ul role="presentation"> <li role="presentation"> <a role="menuitem" lang="en" >English</a> </li> <li role="presentation"> <a role="menuitem" lang="de" >Deutsch</a> </li> <li role="presentation"> <a role="menuitem" lang="es" >Español</a> </li> <li role="presentation"> <a role="menuitem" lang="es_419" >Español – América Latina</a> </li> <li role="presentation"> <a role="menuitem" lang="fr" >Français</a> </li> <li role="presentation"> <a role="menuitem" lang="id" >Indonesia</a> </li> <li role="presentation"> <a role="menuitem" lang="it" >Italiano</a> </li> <li role="presentation"> <a role="menuitem" lang="pl" >Polski</a> </li> <li role="presentation"> <a role="menuitem" lang="pt_br" >Português – Brasil</a> </li> <li role="presentation"> <a role="menuitem" lang="vi" >Tiếng Việt</a> </li> <li role="presentation"> <a role="menuitem" lang="tr" >Türkçe</a> </li> <li role="presentation"> <a role="menuitem" lang="ru" >Русский</a> </li> <li role="presentation"> <a role="menuitem" lang="he" >עברית</a> </li> <li role="presentation"> <a role="menuitem" lang="ar" >العربيّة</a> </li> <li role="presentation"> <a role="menuitem" lang="fa" >فارسی</a> </li> <li role="presentation"> <a role="menuitem" lang="hi" >हिंदी</a> </li> <li role="presentation"> <a role="menuitem" lang="bn" >বাংলা</a> </li> <li role="presentation"> <a role="menuitem" lang="th" >ภาษาไทย</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_cn" >中文 – 简体</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_tw" >中文 – 繁體</a> </li> <li role="presentation"> <a role="menuitem" lang="ja" >日本語</a> </li> <li role="presentation"> <a role="menuitem" lang="ko" >한국어</a> </li> </ul> </devsite-language-selector> <devsite-user enable-profiles fp-auth id="devsite-user"> <span class="button devsite-top-button" aria-hidden="true" visually-hidden>Sign in</span> </devsite-user> </div> </div> </div> <div class="devsite-collapsible-section "> <div class="devsite-header-background"> <div class="devsite-product-id-row" > <div class="devsite-product-description-row"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> <a href="https://developers.google.com/identity/authentication" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Lower Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Authentication" > Authentication </a> </li> </ul> </div> </div> <div class="devsite-doc-set-nav-row"> <devsite-tabs class="lower-tabs"> <nav class="devsite-tabs-wrapper" aria-label="Lower tabs"> <tab > <a href="https://developers.google.com/identity/android-credential-manager" track-metadata-eventdetail="https://developers.google.com/identity/android-credential-manager" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - credential manager for android" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Credential Manager for Android" track-name="credential manager for android" > Credential Manager for Android </a> </tab> <tab > <a href="https://developers.google.com/identity/gsi/web/guides/overview" track-metadata-eventdetail="https://developers.google.com/identity/gsi/web/guides/overview" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - sign in with google for web" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Sign In with Google for Web" track-name="sign in with google for web" > Sign In with Google for Web </a> </tab> <tab class="devsite-active"> <a href="https://developers.google.com/identity/sign-in/ios/start-integrating" track-metadata-eventdetail="https://developers.google.com/identity/sign-in/ios/start-integrating" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - google sign-in for ios and macos" track-metadata-module="primary nav" aria-label="Google Sign-In for iOS and macOS, selected" data-category="Site-Wide Custom Events" data-label="Tab: Google Sign-In for iOS and macOS" track-name="google sign-in for ios and macos" > Google Sign-In for iOS and macOS </a> </tab> <tab > <a href="https://developers.google.com/identity/passkeys" track-metadata-eventdetail="https://developers.google.com/identity/passkeys" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - passkeys" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Passkeys" track-name="passkeys" > Passkeys </a> </tab> <tab > <a href="https://developers.google.com/identity/openid-connect/openid-connect" track-metadata-eventdetail="https://developers.google.com/identity/openid-connect/openid-connect" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - openid connect" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: OpenID Connect" track-name="openid connect" > OpenID Connect </a> </tab> </nav> </devsite-tabs> </div> </div> </div> </div> </devsite-header> <devsite-book-nav scrollbars > <div class="devsite-book-nav-filter" > <span class="filter-list-icon material-icons" aria-hidden="true"></span> <input type="text" placeholder="Filter" aria-label="Type to filter" role="searchbox"> <span class="filter-clear-button hidden" data-title="Clear filter" aria-label="Clear filter" role="button" tabindex="0"></span> </div> <nav class="devsite-book-nav devsite-nav nocontent" aria-label="Side menu"> <div class="devsite-mobile-header"> <button type="button" id="devsite-close-nav" class="devsite-header-icon-button button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Close navigation" aria-label="Close navigation"> </button> <div class="devsite-product-name-wrapper"> <span class="devsite-product-name"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item devsite-has-google-wordmark"> <a href="https://developers.google.com/identity" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Upper Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Google Identity" > <svg class="devsite-google-wordmark" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 148 48"> <title>Google</title> <path class="devsite-google-wordmark-svg-path" d="M19.58,37.65c-9.87,0-18.17-8.04-18.17-17.91c0-9.87,8.3-17.91,18.17-17.91c5.46,0,9.35,2.14,12.27,4.94l-3.45,3.45c-2.1-1.97-4.93-3.49-8.82-3.49c-7.21,0-12.84,5.81-12.84,13.02c0,7.21,5.64,13.02,12.84,13.02c4.67,0,7.34-1.88,9.04-3.58c1.4-1.4,2.32-3.41,2.66-6.16H19.58v-4.89h16.47c0.18,0.87,0.26,1.92,0.26,3.06c0,3.67-1.01,8.21-4.24,11.44C28.93,35.9,24.91,37.65,19.58,37.65z M61.78,26.12c0,6.64-5.1,11.53-11.36,11.53s-11.36-4.89-11.36-11.53c0-6.68,5.1-11.53,11.36-11.53S61.78,19.43,61.78,26.12z M56.8,26.12c0-4.15-2.96-6.99-6.39-6.99c-3.43,0-6.39,2.84-6.39,6.99c0,4.11,2.96,6.99,6.39,6.99C53.84,33.11,56.8,30.22,56.8,26.12z M87.25,26.12c0,6.64-5.1,11.53-11.36,11.53c-6.26,0-11.36-4.89-11.36-11.53c0-6.68,5.1-11.53,11.36-11.53C82.15,14.59,87.25,19.43,87.25,26.12zM82.28,26.12c0-4.15-2.96-6.99-6.39-6.99c-3.43,0-6.39,2.84-6.39,6.99c0,4.11,2.96,6.99,6.39,6.99C79.32,33.11,82.28,30.22,82.28,26.12z M112.09,15.29v20.7c0,8.52-5.02,12.01-10.96,12.01c-5.59,0-8.95-3.76-10.22-6.81l4.41-1.83c0.79,1.88,2.71,4.1,5.81,4.1c3.8,0,6.16-2.36,6.16-6.77v-1.66h-0.18c-1.14,1.4-3.32,2.62-6.07,2.62c-5.76,0-11.05-5.02-11.05-11.49c0-6.51,5.28-11.57,11.05-11.57c2.75,0,4.93,1.22,6.07,2.58h0.18v-1.88H112.09z M107.64,26.16c0-4.06-2.71-7.03-6.16-7.03c-3.49,0-6.42,2.97-6.42,7.03c0,4.02,2.93,6.94,6.42,6.94C104.93,33.11,107.64,30.18,107.64,26.16z M120.97,3.06v33.89h-5.07V3.06H120.97z M140.89,29.92l3.93,2.62c-1.27,1.88-4.32,5.11-9.61,5.11c-6.55,0-11.28-5.07-11.28-11.53c0-6.86,4.77-11.53,10.71-11.53c5.98,0,8.91,4.76,9.87,7.34l0.52,1.31l-15.42,6.38c1.18,2.31,3.01,3.49,5.59,3.49C137.79,33.11,139.58,31.84,140.89,29.92zM128.79,25.77l10.31-4.28c-0.57-1.44-2.27-2.45-4.28-2.45C132.24,19.04,128.66,21.31,128.79,25.77z"/> </svg>Identity </a> </li> </ul> </span> </div> </div> <div class="devsite-book-nav-wrapper"> <div class="devsite-mobile-nav-top"> <ul class="devsite-nav-list"> <li class="devsite-nav-item"> <a href="/identity/authentication" class="devsite-nav-title gc-analytics-event devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Authentication" track-name="authentication" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Authentication" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Authentication </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Authentication" track-name="authentication" > <span class="devsite-nav-text" tooltip menu="Authentication"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Authentication"> </span> </span> </li> </ul> <ul class="devsite-nav-responsive-tabs"> <li class="devsite-nav-item"> <a href="/identity/android-credential-manager" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Credential Manager for Android" track-name="credential manager for android" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Credential Manager for Android" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Credential Manager for Android </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/gsi/web/guides/overview" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Sign In with Google for Web" track-name="sign in with google for web" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Sign In with Google for Web" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Sign In with Google for Web </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/sign-in/ios/start-integrating" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Google Sign-In for iOS and macOS" track-name="google sign-in for ios and macos" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Google Sign-In for iOS and macOS" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip menu="_book"> Google Sign-In for iOS and macOS </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="_book"> </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/passkeys" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Passkeys" track-name="passkeys" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Passkeys" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Passkeys </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/openid-connect/openid-connect" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: OpenID Connect" track-name="openid connect" data-category="Site-Wide Custom Events" data-label="Responsive Tab: OpenID Connect" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > OpenID Connect </span> </a> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/identity/authorization" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Authorization" track-name="authorization" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Authorization" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Authorization </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Authorization" track-name="authorization" > <span class="devsite-nav-text" tooltip menu="Authorization"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Authorization"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/identity/credential-management" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Credential management" track-name="credential management" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Credential management" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Credential management </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Credential management" track-name="credential management" > <span class="devsite-nav-text" tooltip menu="Credential management"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Credential management"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/identity/credential-verification" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Credential verification" track-name="credential verification" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Credential verification" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Credential verification </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Credential verification" track-name="credential verification" > <span class="devsite-nav-text" tooltip menu="Credential verification"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Credential verification"> </span> </span> </li> </ul> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="_book"> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Guides</span> </div></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/start-integrating" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/start-integrating" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/start-integrating" ><span class="devsite-nav-text" tooltip>Get Started</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/sign-in" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/sign-in" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/sign-in" ><span class="devsite-nav-text" tooltip>Add Google Sign-In to Your App</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/sample-app" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/sample-app" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/sample-app" ><span class="devsite-nav-text" tooltip>Try iOS and MacOS Sample App</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/people" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/people" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/people" ><span class="devsite-nav-text" tooltip>Get Profile Information</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/backend-auth" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/backend-auth" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/backend-auth" ><span class="devsite-nav-text" tooltip>Authenticate with a Backend Server</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/disconnect" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/disconnect" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/disconnect" ><span class="devsite-nav-text" tooltip>Disconnect Apps</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/app-privacy" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/app-privacy" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/app-privacy" ><span class="devsite-nav-text" tooltip>App Store Data Disclosure</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Call Google APIs</span> </div></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/api-access" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/api-access" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/api-access" ><span class="devsite-nav-text" tooltip>Client-side Access</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/offline-access" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/offline-access" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/offline-access" ><span class="devsite-nav-text" tooltip>Server-side (Offline) Access</span></a></li> <li class="devsite-nav-item devsite-nav-break"></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/quick-migration-guide" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/quick-migration-guide" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/quick-migration-guide" ><span class="devsite-nav-text" tooltip>Migrate from Earlier Versions</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Implement iOS App Check</span> </div></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/appcheck" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/appcheck" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/appcheck" ><span class="devsite-nav-text" tooltip>Overview</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/appcheck/get-started" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/appcheck/get-started" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/appcheck/get-started" ><span class="devsite-nav-text" tooltip>Get started</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/appcheck/monitor-metrics" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/appcheck/monitor-metrics" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/appcheck/monitor-metrics" ><span class="devsite-nav-text" tooltip>Monitor request metrics</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/appcheck/enable-enforcement" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/appcheck/enable-enforcement" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/appcheck/enable-enforcement" ><span class="devsite-nav-text" tooltip>Enable enforcement</span></a></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/appcheck/debug-provider" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/appcheck/debug-provider" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/appcheck/debug-provider" ><span class="devsite-nav-text" tooltip>Use the debug provider</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Releases</span> </div></li> <li class="devsite-nav-item"><a href="/identity/sign-in/ios/release" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/release" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/release" ><span class="devsite-nav-text" tooltip>Release Notes</span></a></li> <li class="devsite-nav-item devsite-nav-external"><a href="https://github.com/google/GoogleSignIn-iOS/" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: https://github.com/google/GoogleSignIn-iOS/" track-type="bookNav" track-name="click" track-metadata-eventdetail="https://github.com/google/GoogleSignIn-iOS/" ><span class="devsite-nav-text" tooltip>Google Sign-In on GitHub</span><span class="devsite-nav-icon material-icons" data-icon="external" data-title="External" aria-hidden="true"></span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>API Reference</span> </div></li> <li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>GoogleSignIn</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Classes</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Classes" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Classes" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Classes" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Classes/GIDConfiguration" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Classes/GIDConfiguration" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Classes/GIDConfiguration" ><span class="devsite-nav-text" tooltip>GIDConfiguration</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Classes/GIDGoogleUser" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Classes/GIDGoogleUser" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Classes/GIDGoogleUser" ><span class="devsite-nav-text" tooltip>GIDGoogleUser</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Classes/GIDProfileData" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Classes/GIDProfileData" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Classes/GIDProfileData" ><span class="devsite-nav-text" tooltip>GIDProfileData</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Classes/GIDSignIn" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Classes/GIDSignIn" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Classes/GIDSignIn" ><span class="devsite-nav-text" tooltip>GIDSignIn</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Classes/GIDSignInButton" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Classes/GIDSignInButton" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Classes/GIDSignInButton" ><span class="devsite-nav-text" tooltip>GIDSignInButton</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Classes/GIDSignInResult" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Classes/GIDSignInResult" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Classes/GIDSignInResult" ><span class="devsite-nav-text" tooltip>GIDSignInResult</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Classes/GIDToken" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Classes/GIDToken" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Classes/GIDToken" ><span class="devsite-nav-text" tooltip>GIDToken</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Constants</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Constants" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Constants" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Constants" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Constants#/c:@kGIDSignInErrorDomain" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Constants#/c:@kGIDSignInErrorDomain" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Constants#/c:@kGIDSignInErrorDomain" ><span class="devsite-nav-text" tooltip>kGIDSignInErrorDomain</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Enumerations</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Enums" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Enums" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Enums" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Enums/GIDSignInButtonColorScheme" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Enums/GIDSignInButtonColorScheme" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Enums/GIDSignInButtonColorScheme" ><span class="devsite-nav-text" tooltip>GIDSignInButtonColorScheme</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Enums/GIDSignInButtonStyle" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Enums/GIDSignInButtonStyle" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Enums/GIDSignInButtonStyle" ><span class="devsite-nav-text" tooltip>GIDSignInButtonStyle</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference/Enums/GIDSignInErrorCode" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference/Enums/GIDSignInErrorCode" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference/Enums/GIDSignInErrorCode" ><span class="devsite-nav-text" tooltip>GIDSignInErrorCode</span></a></li></ul></div></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>GoogleSignInSwift</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Classes</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference-swift/Classes" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference-swift/Classes" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference-swift/Classes" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference-swift/Classes/GoogleSignInButtonViewModel" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference-swift/Classes/GoogleSignInButtonViewModel" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference-swift/Classes/GoogleSignInButtonViewModel" ><span class="devsite-nav-text" tooltip>GoogleSignInButtonViewModel</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Enumerations</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference-swift/Enums" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference-swift/Enums" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference-swift/Enums" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference-swift/Enums/GoogleSignInButtonColorScheme" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference-swift/Enums/GoogleSignInButtonColorScheme" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference-swift/Enums/GoogleSignInButtonColorScheme" ><span class="devsite-nav-text" tooltip>GoogleSignInButtonColorScheme</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference-swift/Enums/GoogleSignInButtonState" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference-swift/Enums/GoogleSignInButtonState" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference-swift/Enums/GoogleSignInButtonState" ><span class="devsite-nav-text" tooltip>GoogleSignInButtonState</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference-swift/Enums/GoogleSignInButtonStyle" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference-swift/Enums/GoogleSignInButtonStyle" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference-swift/Enums/GoogleSignInButtonStyle" ><span class="devsite-nav-text" tooltip>GoogleSignInButtonStyle</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Structures</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference-swift/Structs" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference-swift/Structs" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference-swift/Structs" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/identity/sign-in/ios/reference-swift/Structs/GoogleSignInButton" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sign-in/ios/reference-swift/Structs/GoogleSignInButton" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sign-in/ios/reference-swift/Structs/GoogleSignInButton" ><span class="devsite-nav-text" tooltip>GoogleSignInButton</span></a></li></ul></div></li></ul></div></li> </ul> <ul class="devsite-nav-list" menu="Authentication" aria-label="Side menu" hidden> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Sign In with Google SDKs </span> </span> </li> <li class="devsite-nav-item"> <a href="/identity/android-credential-manager" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Credential Manager for Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Credential Manager for Android </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/gsi/web/guides/overview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Sign In with Google for Web (including One Tap)" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Sign In with Google for Web (including One Tap) </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/sign-in/ios/start" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Google Sign-In for iOS and macOS" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Google Sign-In for iOS and macOS </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Industry standards </span> </span> </li> <li class="devsite-nav-item"> <a href="/identity/passkeys" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Passkeys" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Passkeys </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/openid-connect/openid-connect" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: OpenID Connect" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > OpenID Connect </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Legacy Sign In </span> </span> </li> <li class="devsite-nav-item"> <a href="/identity/one-tap/android/overview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: One Tap sign-up/sign-in for Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > One Tap sign-up/sign-in for Android </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/sign-in/android/legacy-start-integrating" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Google Sign-In for Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Google Sign-In for Android </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/sign-in/web/sign-in" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Google Sign-In for Web" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Google Sign-In for Web </span> </a> </li> </ul> <ul class="devsite-nav-list" menu="Authorization" aria-label="Side menu" hidden> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Call Google APIs </span> </span> </li> <li class="devsite-nav-item"> <a href="/identity/sign-in/android/authorize-access" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Authorizing for Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Authorizing for Android </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/oauth2/web/guides/overview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Authorizing for Web" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip 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class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Seamless credential sharing" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Seamless credential sharing </span> </a> </li> </ul> <ul class="devsite-nav-list" menu="Credential verification" aria-label="Side menu" hidden> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Android </span> </span> </li> <li class="devsite-nav-item"> <a href="/identity/sms-retriever/overview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Verify users by SMS" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Verify users by SMS </span> </a> </li> <li class="devsite-nav-item"> <a 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<button> Send feedback </button> </devsite-feedback> <h1 class="devsite-page-title" tabindex="-1"> Access Google APIs in an iOS app </h1> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <p>Some Google services, such as Drive, Gmail, and many others, provide public APIs that you can use to create apps that help users work with their data in these services. To access these services, apps must implement one of the OAuth 2.0 client flows to get consent from users and obtain <em>access tokens</em>, which grant access to the APIs.</p> <p>You can use the Google Sign-In library, which implements the OAuth 2.0 flow for you, to get access tokens for the signed-in user.</p> <h2 id="before_you_begin" data-text="Before you begin" tabindex="-1">Before you begin</h2> <p>You must complete the <a href="/identity/sign-in/ios/sign-in">basic Google Sign-In integration</a>.</p> <h2 id="1_check_which_scopes_have_been_granted" data-text="1. Check which scopes have been granted" tabindex="-1">1. Check which scopes have been granted</h2> <p>Before you make a call to a Google API, check which scopes have already been granted to your app, using the <code translate="no" dir="ltr">grantedScopes</code> property of <code translate="no" dir="ltr">GIDGoogleUser</code>:</p> <div class="ds-selector-tabs" data-ds-scope="code-sample"> <section><h3 id="swift" data-text="Swift" tabindex="-1">Swift</h3><div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Swift"><code translate="no" dir="ltr"><span class="devsite-syntax-kd">let</span> <span class="devsite-syntax-nv">driveScope</span> <span class="devsite-syntax-p">=</span> <span class="devsite-syntax-s">"https://www.googleapis.com/auth/drive.readonly"</span> <span class="devsite-syntax-kd">let</span> <span class="devsite-syntax-nv">grantedScopes</span> <span class="devsite-syntax-p">=</span> <span class="devsite-syntax-n">user</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">grantedScopes</span> <span class="devsite-syntax-k">if</span> <span class="devsite-syntax-n">grantedScopes</span> <span class="devsite-syntax-p">==</span> <span class="devsite-syntax-kc">nil</span> <span class="devsite-syntax-o">||</span> <span class="devsite-syntax-o">!</span><span class="devsite-syntax-n">grantedScopes</span><span class="devsite-syntax-p">!.</span><span class="devsite-syntax-bp">contains</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">driveScope</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-p">{</span> <span class="devsite-syntax-c1">// Request additional Drive scope.</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code></section> <section><h3 id="objective-c" data-text="Objective-C" tabindex="-1">Objective-C</h3><div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Objective-C"><code translate="no" dir="ltr"><span class="devsite-syntax-bp">NSString</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">*</span><span class="devsite-syntax-n">driveScope</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s">@"https://www.googleapis.com/auth/drive.readonly"</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-c1">// Check if the user has granted the Drive scope</span> <span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-o">!</span><span class="devsite-syntax-p">[</span><span class="devsite-syntax-n">user</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">grantedScopes</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">containsObject</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-n">driveScope</span><span class="devsite-syntax-p">])</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// request additional drive scope</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code></section> </div> <p>Based on whether or not a certain scope has been granted by the user, you might need to make a request for an additional scope in order to support a particular interaction.</p> <h2 id="2_request_additional_scopes" data-text="2. Request additional scopes" tabindex="-1">2. Request additional scopes</h2> <p>If you need to request additional scopes, call <code translate="no" dir="ltr">addScopes:presentingViewController:completion</code> or <code translate="no" dir="ltr">addScopes:presentingWindow:completion</code> to ask the user to grant your app additional access.</p> <p>For example, to request read-only access to a user's Drive files:</p> <div class="ds-selector-tabs" data-ds-scope="code-sample"> <section><h3 id="swift_1" data-text="Swift" tabindex="-1">Swift</h3><div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Swift"><code translate="no" dir="ltr"><span class="devsite-syntax-kd">let</span> <span class="devsite-syntax-nv">additionalScopes</span> <span class="devsite-syntax-p">=</span> <span class="devsite-syntax-p">[</span><span class="devsite-syntax-s">"https://www.googleapis.com/auth/drive.readonly"</span><span class="devsite-syntax-p">]</span> <span class="devsite-syntax-k">guard</span> <span class="devsite-syntax-kd">let</span> <span class="devsite-syntax-nv">currentUser</span> <span class="devsite-syntax-p">=</span> <span class="devsite-syntax-n">GIDSignIn</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">sharedInstance</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">currentUser</span> <span class="devsite-syntax-k">else</span> <span class="devsite-syntax-p">{</span> <span class="devsite-syntax-k">return</span> <span class="devsite-syntax-p">;</span> <span class="devsite-syntax-cm">/* Not signed in. */</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-n">currentUser</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">addScopes</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">additionalScopes</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-n">presenting</span><span class="devsite-syntax-p">:</span> <span class="devsite-syntax-kc">self</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-p">{</span> <span class="devsite-syntax-n">signInResult</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-n">error</span> <span class="devsite-syntax-k">in</span> <span class="devsite-syntax-k">guard</span> <span class="devsite-syntax-n">error</span> <span class="devsite-syntax-p">==</span> <span class="devsite-syntax-kc">nil</span> <span class="devsite-syntax-k">else</span> <span class="devsite-syntax-p">{</span> <span class="devsite-syntax-k">return</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-k">guard</span> <span class="devsite-syntax-kd">let</span> <span class="devsite-syntax-nv">signInResult</span> <span class="devsite-syntax-p">=</span> <span class="devsite-syntax-n">signInResult</span> <span class="devsite-syntax-k">else</span> <span class="devsite-syntax-p">{</span> <span class="devsite-syntax-k">return</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-c1">// Check if the user granted access to the scopes you requested.</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code></section> <section><h3 id="objective-c_1" data-text="Objective-C" tabindex="-1">Objective-C</h3><div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Objective-C"><code translate="no" dir="ltr"><span class="devsite-syntax-bp">NSArray</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">*</span><span class="devsite-syntax-n">additionalScopes</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-l">@[</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s">@"https://www.googleapis.com/auth/drive.readonly"</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-l">]</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-n">GIDGoogleUser</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">*</span><span class="devsite-syntax-n">currentUser</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">GIDSignIn</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">sharedInstance</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">currentUser</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-p">[</span><span class="devsite-syntax-n">currentUser</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">addScopes</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-n">additionalScopes</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nl">presentingViewController</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-nb">self</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nl">completion</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-o">^</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">GIDSignInResult</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">*</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">_Nullable</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">signInResult</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-bp">NSError</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">*</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">_Nullable</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">error</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">error</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">return</span><span class="devsite-syntax-p">;</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">signInResult</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">==</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nb">nil</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">return</span><span class="devsite-syntax-p">;</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// Check if the user granted access to the scopes you requested.</span> <span class="devsite-syntax-p">}];</span> </code></pre></devsite-code></section> </div> <h2 id="3_make_an_api_call_with_fresh_tokens" data-text="3. Make an API call with fresh tokens" tabindex="-1">3. Make an API call with fresh tokens</h2> <p>To ensure that your Google API calls always have unexpired access tokens attached, wrap the calls in a <code translate="no" dir="ltr">refreshTokensIfNeededWithCompletion:</code> block:</p> <div class="ds-selector-tabs" data-ds-scope="code-sample"> <section><h3 id="swift_2" data-text="Swift" tabindex="-1">Swift</h3><div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Swift"><code translate="no" dir="ltr"><span class="devsite-syntax-n">currentUser</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">refreshTokensIfNeeded</span> <span class="devsite-syntax-p">{</span> <span class="devsite-syntax-n">user</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-n">error</span> <span class="devsite-syntax-k">in</span> <span class="devsite-syntax-k">guard</span> <span class="devsite-syntax-n">error</span> <span class="devsite-syntax-p">==</span> <span class="devsite-syntax-kc">nil</span> <span class="devsite-syntax-k">else</span> <span class="devsite-syntax-p">{</span> <span class="devsite-syntax-k">return</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-k">guard</span> <span class="devsite-syntax-kd">let</span> <span class="devsite-syntax-nv">user</span> <span class="devsite-syntax-p">=</span> <span class="devsite-syntax-n">user</span> <span class="devsite-syntax-k">else</span> <span class="devsite-syntax-p">{</span> <span class="devsite-syntax-k">return</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-c1">// Get the access token to attach it to a REST or gRPC request.</span> <span class="devsite-syntax-kd">let</span> <span class="devsite-syntax-nv">accessToken</span> <span class="devsite-syntax-p">=</span> <span class="devsite-syntax-n">user</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">accessToken</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">tokenString</span> <span class="devsite-syntax-c1">// Or, get an object that conforms to GTMFetcherAuthorizationProtocol for</span> <span class="devsite-syntax-c1">// use with GTMAppAuth and the Google APIs client library.</span> <span class="devsite-syntax-kd">let</span> <span class="devsite-syntax-nv">authorizer</span> <span class="devsite-syntax-p">=</span> <span class="devsite-syntax-n">user</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">fetcherAuthorizer</span><span class="devsite-syntax-p">()</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code></section> <section><h3 id="objective-c_2" data-text="Objective-C" tabindex="-1">Objective-C</h3><div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Objective-C"><code translate="no" dir="ltr"><span class="devsite-syntax-p">[</span><span class="devsite-syntax-n">currentUser</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">refreshTokensIfNeededWithCompletion</span><span class="devsite-syntax-o">:^</span><span class="devsite-syntax-p">(</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">GIDGoogleUser</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">*</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">_Nullable</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">user</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-bp">NSError</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">*</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">_Nullable</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">error</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">error</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">return</span><span class="devsite-syntax-p">;</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">user</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">==</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nb">nil</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">return</span><span class="devsite-syntax-p">;</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// Get the access token to attach it to a REST or gRPC request.</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-bp">NSString</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">*</span><span class="devsite-syntax-n">accessToken</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">user</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">accessToken</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-n">tokenString</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// Or, get an object that conforms to GTMFetcherAuthorizationProtocol for</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-c1">// use with GTMAppAuth and the Google APIs client library.</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">id<GTMFetcherAuthorizationProtocol></span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">authorizer</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">[</span><span class="devsite-syntax-n">user</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">fetcherAuthorizer</span><span class="devsite-syntax-p">];</span> <span class="devsite-syntax-p">}];</span> </code></pre></devsite-code></section> </div> <p>Use the access token to call the API, by either including the access token in the header of a REST or gRPC request (<code translate="no" dir="ltr">Authorization: Bearer <var translate="no">ACCESS_TOKEN</var></code>), or by using the fetcher authorizer with the <a href="https://github.com/google/google-api-objectivec-client-for-rest/">Google APIs Client Library</a>.</p> </div> <devsite-recommendations display="in-page" hidden yield> </devsite-recommendations> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <devsite-feedback position="footer" project-name="Authentication" product-id="5186570" bucket="Identity guides" context="External devsite feedback" version="t-devsite-webserver-20241114-r00-rc02.464922260396498922" data-label="Send Feedback Button" track-type="feedback" track-name="sendFeedbackLink" track-metadata-position="footer" class="nocontent" project-icon="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/developers/images/touchicon-180-new.png" > <button> Send feedback </button> </devsite-feedback> <devsite-recommendations id="recommendations-link" 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