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ak al mv an ao ap ex mw mx mk my mz na nb nc s nd ne nf ng nh ni nj u nk nl nm"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="none" viewBox="0 0 24 24"><path fill="currentColor" fill-rule="evenodd" d="M15.218 4.931a.4.4 0 0 1-.118.132l.012.006a.45.45 0 0 1-.292.074.5.5 0 0 1-.3-.13l-2.02-2.02v7.07c0 .28-.23.5-.5.5s-.5-.22-.5-.5v-7.04l-2 2a.45.45 0 0 1-.57.04h-.02a.4.4 0 0 1-.16-.3.4.4 0 0 1 .1-.32l2.8-2.8a.5.5 0 0 1 .7 0l2.8 2.79a.42.42 0 0 1 .068.498m-.106.138.008.004v-.01zM16 7.063h1.5a2 2 0 0 1 2 2v10a2 2 0 0 1-2 2h-11c-1.1 0-2-.9-2-2v-10a2 2 0 0 1 2-2H8a.5.5 0 0 1 .35.15.5.5 0 0 1 .15.35.5.5 0 0 1-.15.35.5.5 0 0 1-.35.15H6.4c-.5 0-.9.4-.9.9v10.2a.9.9 0 0 0 .9.9h11.2c.5 0 .9-.4.9-.9v-10.2c0-.5-.4-.9-.9-.9H16a.5.5 0 0 1 0-1" clip-rule="evenodd"></path></svg><div class="j i d"><p class="bf b bg z du">Share</p></div></button></div></div></div></div></div></div></div></div></div><p id="e8d1" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">This article introduces you to Kotlin Multiplatform (KMP), explains how it works, discusses its pros and cons, and addresses all your queries by the end of the article.</p><figure class="om on oo op oq or oj ok paragraph-image"><div role="button" tabindex="0" class="os ot fj ou bh ov"><div class="oj ok ol"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*PVv1qHHT7XI40R1emEBvQw.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*PVv1qHHT7XI40R1emEBvQw.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*PVv1qHHT7XI40R1emEBvQw.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*PVv1qHHT7XI40R1emEBvQw.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*PVv1qHHT7XI40R1emEBvQw.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*PVv1qHHT7XI40R1emEBvQw.png 1100w, https://miro.medium.com/v2/resize:fit:1400/format:webp/1*PVv1qHHT7XI40R1emEBvQw.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*PVv1qHHT7XI40R1emEBvQw.png 640w, https://miro.medium.com/v2/resize:fit:720/1*PVv1qHHT7XI40R1emEBvQw.png 720w, https://miro.medium.com/v2/resize:fit:750/1*PVv1qHHT7XI40R1emEBvQw.png 750w, https://miro.medium.com/v2/resize:fit:786/1*PVv1qHHT7XI40R1emEBvQw.png 786w, https://miro.medium.com/v2/resize:fit:828/1*PVv1qHHT7XI40R1emEBvQw.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*PVv1qHHT7XI40R1emEBvQw.png 1100w, https://miro.medium.com/v2/resize:fit:1400/1*PVv1qHHT7XI40R1emEBvQw.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px"/><img alt="" class="bh mu ow c" width="700" height="237" loading="lazy" role="presentation"/></picture></div></div></figure><h1 id="4abd" class="ox oy gu bf oz pa pb hz pc pd pe ic pf pg ph pi pj pk pl pm pn po pp pq pr ps bk">What is Kotlin multi platform ?</h1><p id="06c9" class="pw-post-body-paragraph nn no gu np b hx pt nr ns ia pu nu nv nw pv ny nz oa pw oc od oe px og oh oi gn bk">Kotlin Multiplatform is a technology that allows you to create applications for various platforms and efficiently reuse code across them <strong class="np he"><em class="py">while retaining the benefits of native programming.</em></strong></p><h1 id="f0c1" class="ox oy gu bf oz pa pb hz pc pd pe ic pf pg ph pi pj pk pl pm pn po pp pq pr ps bk">Why I like Kotlin multi platform over other cross platform technologies ?</h1><p id="b782" class="pw-post-body-paragraph nn no gu np b hx pt nr ns ia pu nu nv nw pv ny nz oa pw oc od oe px og oh oi gn bk">Unlike other cross platform techs, KMP doesn’t force you to build the UI in a cross-platform way. With KMP, you can keep the UI truly native for each platform and only share the business logic, networking, and database layer code across platforms.</p><h1 id="e0e4" class="ox oy gu bf oz pa pb hz pc pd pe ic pf pg ph pi pj pk pl pm pn po pp pq pr ps bk">Architecture of an application developed using KMP</h1><figure class="om on oo op oq or oj ok paragraph-image"><div role="button" tabindex="0" class="os ot fj ou bh ov"><div class="oj ok pz"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*VgsgBVip6GfTibLQPd7qDA.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*VgsgBVip6GfTibLQPd7qDA.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*VgsgBVip6GfTibLQPd7qDA.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*VgsgBVip6GfTibLQPd7qDA.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*VgsgBVip6GfTibLQPd7qDA.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*VgsgBVip6GfTibLQPd7qDA.png 1100w, https://miro.medium.com/v2/resize:fit:1400/format:webp/1*VgsgBVip6GfTibLQPd7qDA.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*VgsgBVip6GfTibLQPd7qDA.png 640w, https://miro.medium.com/v2/resize:fit:720/1*VgsgBVip6GfTibLQPd7qDA.png 720w, https://miro.medium.com/v2/resize:fit:750/1*VgsgBVip6GfTibLQPd7qDA.png 750w, https://miro.medium.com/v2/resize:fit:786/1*VgsgBVip6GfTibLQPd7qDA.png 786w, https://miro.medium.com/v2/resize:fit:828/1*VgsgBVip6GfTibLQPd7qDA.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*VgsgBVip6GfTibLQPd7qDA.png 1100w, https://miro.medium.com/v2/resize:fit:1400/1*VgsgBVip6GfTibLQPd7qDA.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px"/><img alt="" class="bh mu ow c" width="700" height="440" loading="lazy" role="presentation"/></picture></div></div><figcaption class="qa ff qb oj ok qc qd bf b bg z du">Architecture of a app using KMP</figcaption></figure><p id="168e" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">Above is the architecture of a application which uses KMP tech. Now we will discuss on each layer of this in detail.</p><p id="c41a" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk qe"><span class="l qf qg qh bo qi qj qk ql qm fj">A</span><strong class="np he">ndroid app : </strong>This layer indicates the android app layer, which includes the UI development using Jetpack compose/xml. This is the biggest advantage , we are not forced to develop UI in any other language like Dart, Javascript etc., like other cross platform technologies.</p><p id="2c09" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk qe"><span class="l qf qg qh bo qi qj qk ql qm fj">T</span><strong class="np he">he iOS app : </strong>This layer is similar to android layer , here we develop our UI using swift keeping. So we will leverage the performance of the native tech here.</p><p id="3d0c" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk"><strong class="np he">So can’t we develop a common UI and reuse across the platforms ?</strong></p><p id="e222" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">We can do that. <em class="py">Compose multi platform</em> is the solution for that.But in this article we will discuss only about Kotlin Multi Platform , not Compose Multi Platform.</p><p id="5d25" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk qe"><span class="l qf qg qh bo qi qj qk ql qm fj">B</span><strong class="np he">usiness logic : </strong>This is the important layer where we can write business logic and both iOS and Android apps can use this business logic.</p><p id="4cd6" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk"><strong class="np he"><em class="py">-> which programming language ?</em></strong> Kotlin</p><p id="5cf8" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk"><strong class="np he"><em class="py">How do we share this with other platforms ?</em></strong> once we write the logic , we can generate .aar which can be used in android apps and .framework which can be used in iOS apps.</p><p id="82f2" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk"><strong class="np he"><em class="py">-> What if we want to use some platform specific apis ?</em></strong></p><p id="cceb" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">By looking at below structure of “shared” layer in KMP , you could have already guessed , the common business logic we can write in commonMain layer.</p><figure class="om on oo op oq or oj ok paragraph-image"><div role="button" tabindex="0" class="os ot fj ou bh ov"><div class="oj ok qn"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*Kla5scB09x_N4ZDsne5hag.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*Kla5scB09x_N4ZDsne5hag.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*Kla5scB09x_N4ZDsne5hag.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*Kla5scB09x_N4ZDsne5hag.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*Kla5scB09x_N4ZDsne5hag.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*Kla5scB09x_N4ZDsne5hag.png 1100w, https://miro.medium.com/v2/resize:fit:1400/format:webp/1*Kla5scB09x_N4ZDsne5hag.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*Kla5scB09x_N4ZDsne5hag.png 640w, https://miro.medium.com/v2/resize:fit:720/1*Kla5scB09x_N4ZDsne5hag.png 720w, https://miro.medium.com/v2/resize:fit:750/1*Kla5scB09x_N4ZDsne5hag.png 750w, https://miro.medium.com/v2/resize:fit:786/1*Kla5scB09x_N4ZDsne5hag.png 786w, https://miro.medium.com/v2/resize:fit:828/1*Kla5scB09x_N4ZDsne5hag.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*Kla5scB09x_N4ZDsne5hag.png 1100w, https://miro.medium.com/v2/resize:fit:1400/1*Kla5scB09x_N4ZDsne5hag.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px"/><img alt="" class="bh mu ow c" width="700" height="281" loading="lazy" role="presentation"/></picture></div></div></figure><figure class="om on oo op oq or oj ok paragraph-image"><div class="oj ok qo"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*PYqMT0gmz8dFMtiZvc_7-g.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*PYqMT0gmz8dFMtiZvc_7-g.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*PYqMT0gmz8dFMtiZvc_7-g.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*PYqMT0gmz8dFMtiZvc_7-g.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*PYqMT0gmz8dFMtiZvc_7-g.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*PYqMT0gmz8dFMtiZvc_7-g.png 1100w, https://miro.medium.com/v2/resize:fit:1132/format:webp/1*PYqMT0gmz8dFMtiZvc_7-g.png 1132w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 566px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*PYqMT0gmz8dFMtiZvc_7-g.png 640w, https://miro.medium.com/v2/resize:fit:720/1*PYqMT0gmz8dFMtiZvc_7-g.png 720w, https://miro.medium.com/v2/resize:fit:750/1*PYqMT0gmz8dFMtiZvc_7-g.png 750w, https://miro.medium.com/v2/resize:fit:786/1*PYqMT0gmz8dFMtiZvc_7-g.png 786w, https://miro.medium.com/v2/resize:fit:828/1*PYqMT0gmz8dFMtiZvc_7-g.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*PYqMT0gmz8dFMtiZvc_7-g.png 1100w, https://miro.medium.com/v2/resize:fit:1132/1*PYqMT0gmz8dFMtiZvc_7-g.png 1132w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 566px"/><img alt="" class="bh mu ow c" width="566" height="294" loading="lazy" role="presentation"/></picture></div><figcaption class="qa ff qb oj ok qc qd bf b bg z du">Folder structure</figcaption></figure><p id="3b5e" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">But what if we want to use some platform specific Api ?? Lets take a simple example . I want to display version info in the UI, and to get version info, we need to access platform specific Api. Also I need platform specific api to print the logs. Below simple code example will explain how KMP solves this problem.</p><p id="52e1" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">Before going through the code , we need to know about expect and actual declarations.</p><blockquote class="qp qq qr"><p id="df28" class="nn no py np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">In Kotlin Multiplatform, the <code class="cx qs qt qu qv b">expect</code> declaration defines a common interface or API that must be implemented in platform-specific code, while the <code class="cx qs qt qu qv b">actual</code> declaration provides the platform-specific implementation of that interface or API.</p></blockquote><p id="95fd" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">In <strong class="np he"><em class="py">commonMain</em></strong></p><pre class="om on oo op oq qw qv qx bp qy bb bk"><span id="65c6" class="qz oy gu qv b bg ra rb l rc rd">expect class Platform {<br/> val osVersion: String<br/> fun logSystemInfo()<br/>}</span></pre><p id="2e62" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">In <strong class="np he"><em class="py">androidMain</em></strong></p><pre class="om on oo op oq qw qv qx bp qy bb bk"><span id="e18a" class="qz oy gu qv b bg ra rb l rc rd">actual class Platform() {<br/> actual val osVersion: String<br/> get() = "${Build.VERSION.SDK_INT}"<br/><br/> actual fun logSystemInfo() {<br/> Log.d(<br/> "KMP Android",<br/> "($osName, $osVersion, $deviceModel, $density)"<br/> )<br/> }<br/>}</span></pre><p id="4f40" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">In <strong class="np he"><em class="py">iOSMain</em></strong></p><pre class="om on oo op oq qw qv qx bp qy bb bk"><span id="c7e3" class="qz oy gu qv b bg ra rb l rc rd">actual class Platform() {<br/> actual val osVersion: String<br/> get() = UIDevice.currentDevice.systemVersion<br/><br/> actual fun logSystemInfo() {<br/> NSLog(<br/> "($osVersion)"<br/> )<br/> }<br/>}</span></pre><p id="09e1" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">Ok . Now we are done with the Business Logic layer in the arch diagram. Lets continue with other blocks .</p><p id="8652" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk qe"><span class="l qf qg qh bo qi qj qk ql qm fj">D</span><strong class="np he">ata layer (network + database) :</strong></p><p id="202a" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">From the business logic layer , we understood how we can share the business logic across platforms. Sharing the network layer and database layer is even more simple. <a class="af re" href="https://ktor.io/docs/client-create-multiplatform-application.html" rel="noopener ugc nofollow" target="_blank">Ktor</a> networking library supports KMP for network layer and <a class="af re" href="https://www.jetbrains.com/help/kotlin-multiplatform-dev/multiplatform-ktor-sqldelight.html" rel="noopener ugc nofollow" target="_blank">SQLdelight</a> supports KMP for database layer. Both are officially supported and recommended by Jetbrains. This article will not discuss about the network layer and data base layer integrations. This <a class="af re" href="https://www.jetbrains.com/help/kotlin-multiplatform-dev/multiplatform-ktor-sqldelight.html" rel="noopener ugc nofollow" target="_blank">official guide </a>from JetBrains provides the integration details.</p></div></div></div><div class="ab cb rf rg rh ri" role="separator"><span class="rj by bm rk rl rm"></span><span class="rj by bm rk rl rm"></span><span class="rj by bm rk rl"></span></div><div class="gn go gp gq gr"><div class="ab cb"><div class="ci bh fz ga gb gc"><p id="ebb6" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk qe"><span class="l qf qg qh bo qi qj qk ql qm fj">H</span>ow does KMP work ?</p><figure class="om on oo op oq or oj ok paragraph-image"><div class="oj ok rn"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*HHpkFBGyuXjTP3QRzT1iuA.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*HHpkFBGyuXjTP3QRzT1iuA.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*HHpkFBGyuXjTP3QRzT1iuA.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*HHpkFBGyuXjTP3QRzT1iuA.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*HHpkFBGyuXjTP3QRzT1iuA.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*HHpkFBGyuXjTP3QRzT1iuA.png 1100w, https://miro.medium.com/v2/resize:fit:368/format:webp/1*HHpkFBGyuXjTP3QRzT1iuA.png 368w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 184px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*HHpkFBGyuXjTP3QRzT1iuA.png 640w, https://miro.medium.com/v2/resize:fit:720/1*HHpkFBGyuXjTP3QRzT1iuA.png 720w, https://miro.medium.com/v2/resize:fit:750/1*HHpkFBGyuXjTP3QRzT1iuA.png 750w, https://miro.medium.com/v2/resize:fit:786/1*HHpkFBGyuXjTP3QRzT1iuA.png 786w, https://miro.medium.com/v2/resize:fit:828/1*HHpkFBGyuXjTP3QRzT1iuA.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*HHpkFBGyuXjTP3QRzT1iuA.png 1100w, https://miro.medium.com/v2/resize:fit:368/1*HHpkFBGyuXjTP3QRzT1iuA.png 368w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 184px"/><img alt="" class="bh mu ow c" width="184" height="198" loading="eager" role="presentation"/></picture></div></figure><p id="6e58" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">So far we have seen what all KMP offers us. But how is all this working , kotlin is just a language right ? and how it is offering all these. So, here we need to know about <strong class="np he">kotlin/native</strong> .</p><blockquote class="qp qq qr"><p id="419f" class="nn no py np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk"><strong class="np he">Kotlin/Native</strong> is a technology for compiling Kotlin code to native binaries which can run without a virtual machine.</p></blockquote><p id="3f00" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">So all the kotlin code is converted to native binaries and then be used during execution. It also generates <code class="cx qs qt qu qv b">.knm</code>files. <code class="cx qs qt qu qv b">.knm</code> files are Kotlin Native Metadata files that contain information about Kotlin symbols and their interoperability with Swift or Objective-C, enabling seamless integration of Kotlin code with iOS applications.</p></div></div></div><div class="ab cb rf rg rh ri" role="separator"><span class="rj by bm rk rl rm"></span><span class="rj by bm rk rl rm"></span><span class="rj by bm rk rl"></span></div><div class="gn go gp gq gr"><div class="ab cb"><div class="ci bh fz ga gb gc"><p id="af14" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk"><strong class="np he">Q)</strong> So everything looks fine so far. Then what are the difficulties in KMP. Everything is smooth here.</p><figure class="om on oo op oq or oj ok paragraph-image"><div class="oj ok ro"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*IXMBFAM64506EYoc7j1G1A.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*IXMBFAM64506EYoc7j1G1A.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*IXMBFAM64506EYoc7j1G1A.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*IXMBFAM64506EYoc7j1G1A.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*IXMBFAM64506EYoc7j1G1A.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*IXMBFAM64506EYoc7j1G1A.png 1100w, https://miro.medium.com/v2/resize:fit:396/format:webp/1*IXMBFAM64506EYoc7j1G1A.png 396w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 198px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*IXMBFAM64506EYoc7j1G1A.png 640w, https://miro.medium.com/v2/resize:fit:720/1*IXMBFAM64506EYoc7j1G1A.png 720w, https://miro.medium.com/v2/resize:fit:750/1*IXMBFAM64506EYoc7j1G1A.png 750w, https://miro.medium.com/v2/resize:fit:786/1*IXMBFAM64506EYoc7j1G1A.png 786w, https://miro.medium.com/v2/resize:fit:828/1*IXMBFAM64506EYoc7j1G1A.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*IXMBFAM64506EYoc7j1G1A.png 1100w, https://miro.medium.com/v2/resize:fit:396/1*IXMBFAM64506EYoc7j1G1A.png 396w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 198px"/><img alt="" class="bh mu ow c" width="198" height="184" loading="eager" role="presentation"/></picture></div></figure><p id="2667" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk"><strong class="np he">NO</strong>. Like every cross platform tech , KMP integration has its own problems. In android it all goes smooth as everything is in kotlin . But how about iOS ?</p><ul class=""><li id="e840" class="nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi rp rq rr bk">In iOS , swift language has to work with kotlin language. So , I found it difficult to <strong class="np he">debug</strong> when there is problem or a crash.</li><li id="5242" class="nn no gu np b hx rs nr ns ia rt nu nv nw ru ny nz oa rv oc od oe rw og oh oi rp rq rr bk">Also , what if the methods of kotlin data layer starts return <strong class="np he">Flow</strong>, a kotlin related observable. Will the iOS swift code can understand that ?</li><li id="0b4f" class="nn no gu np b hx rs nr ns ia rt nu nv nw ru ny nz oa rv oc od oe rw og oh oi rp rq rr bk">Most of the data layer functions are <strong class="np he">suspend </strong>, but swift language does not understand what is a suspend function<strong class="np he">.</strong></li><li id="1ee5" class="nn no gu np b hx rs nr ns ia rt nu nv nw ru ny nz oa rv oc od oe rw og oh oi rp rq rr bk">Since it also generates native binaries and those are included in .framework, it contributes to size increment in iOS app. In my experience after integrating ktor and sqlDelight , observed around 1 mb size increase.</li></ul><p id="9995" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">So how to solve all these problems ? The solution is Swift Kotlin Interface Enhancer, also called as <a class="af re" href="https://skie.touchlab.co/" rel="noopener ugc nofollow" target="_blank">SKIE</a> . This solves the problems mentioned above about <a class="af re" href="https://skie.touchlab.co/features/flows" rel="noopener ugc nofollow" target="_blank">flows</a> and <a class="af re" href="https://skie.touchlab.co/features/suspend" rel="noopener ugc nofollow" target="_blank">suspend</a>. Not just these, SKIE solves the general problems between these two languages.</p></div></div></div><div class="ab cb rf rg rh ri" role="separator"><span class="rj by bm rk rl rm"></span><span class="rj by bm rk rl rm"></span><span class="rj by bm rk rl"></span></div><div class="gn go gp gq gr"><div class="ab cb"><div class="ci bh fz ga gb gc"><p id="f0a6" class="pw-post-body-paragraph nn no gu np b hx nq nr ns ia nt nu nv nw nx ny nz oa ob oc od oe of og oh oi gn bk">Hope you have learnt new things about mobile development today !! . 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With KMP, you can keep the UI truly native for each platform and only share the business logic, networking, and database layer code across platforms.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_9":{"__typename":"Paragraph","id":"09f07f1cb22f_9","name":"e0e4","type":"H3","href":null,"layout":null,"metadata":null,"text":"Architecture of an application developed using KMP","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"ImageMetadata:1*VgsgBVip6GfTibLQPd7qDA.png":{"__typename":"ImageMetadata","id":"1*VgsgBVip6GfTibLQPd7qDA.png","originalHeight":1368,"originalWidth":2178,"focusPercentX":null,"focusPercentY":null,"alt":null},"Paragraph:09f07f1cb22f_10":{"__typename":"Paragraph","id":"09f07f1cb22f_10","name":"2bf7","type":"IMG","href":null,"layout":"INSET_CENTER","metadata":{"__ref":"ImageMetadata:1*VgsgBVip6GfTibLQPd7qDA.png"},"text":"Architecture of a app using KMP","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_11":{"__typename":"Paragraph","id":"09f07f1cb22f_11","name":"168e","type":"P","href":null,"layout":null,"metadata":null,"text":"Above is the architecture of a application which uses KMP tech. Now we will discuss on each layer of this in detail.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_12":{"__typename":"Paragraph","id":"09f07f1cb22f_12","name":"c41a","type":"P","href":null,"layout":null,"metadata":null,"text":"Android app : This layer indicates the android app layer, which includes the UI development using Jetpack compose\u002Fxml. This is the biggest advantage , we are not forced to develop UI in any other language like Dart, Javascript etc., like other cross platform technologies.","hasDropCap":true,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":14,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_13":{"__typename":"Paragraph","id":"09f07f1cb22f_13","name":"2c09","type":"P","href":null,"layout":null,"metadata":null,"text":"The iOS app : This layer is similar to android layer , here we develop our UI using swift keeping. So we will leverage the performance of the native tech here.","hasDropCap":true,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":14,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_14":{"__typename":"Paragraph","id":"09f07f1cb22f_14","name":"3d0c","type":"P","href":null,"layout":null,"metadata":null,"text":"So can’t we develop a common UI and reuse across the platforms ?","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":64,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_15":{"__typename":"Paragraph","id":"09f07f1cb22f_15","name":"e222","type":"P","href":null,"layout":null,"metadata":null,"text":"We can do that. Compose multi platform is the solution for that.But in this article we will discuss only about Kotlin Multi Platform , not Compose Multi Platform.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"EM","start":16,"end":38,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_16":{"__typename":"Paragraph","id":"09f07f1cb22f_16","name":"5d25","type":"P","href":null,"layout":null,"metadata":null,"text":"Business logic : This is the important layer where we can write business logic and both iOS and Android apps can use this business logic.","hasDropCap":true,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":17,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_17":{"__typename":"Paragraph","id":"09f07f1cb22f_17","name":"4cd6","type":"P","href":null,"layout":null,"metadata":null,"text":"-\u003E which programming language ? Kotlin","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":31,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":0,"end":31,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_18":{"__typename":"Paragraph","id":"09f07f1cb22f_18","name":"5cf8","type":"P","href":null,"layout":null,"metadata":null,"text":"How do we share this with other platforms ? once we write the logic , we can generate .aar which can be used in android apps and .framework which can be used in iOS apps.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":43,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":0,"end":43,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_19":{"__typename":"Paragraph","id":"09f07f1cb22f_19","name":"82f2","type":"P","href":null,"layout":null,"metadata":null,"text":"-\u003E What if we want to use some platform specific apis ?","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":55,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":0,"end":55,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_20":{"__typename":"Paragraph","id":"09f07f1cb22f_20","name":"cceb","type":"P","href":null,"layout":null,"metadata":null,"text":"By looking at below structure of “shared” layer in KMP , you could have already guessed , the common business logic we can write in commonMain layer.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"ImageMetadata:1*Kla5scB09x_N4ZDsne5hag.png":{"__typename":"ImageMetadata","id":"1*Kla5scB09x_N4ZDsne5hag.png","originalHeight":684,"originalWidth":1708,"focusPercentX":null,"focusPercentY":null,"alt":null},"Paragraph:09f07f1cb22f_21":{"__typename":"Paragraph","id":"09f07f1cb22f_21","name":"2cd6","type":"IMG","href":null,"layout":"INSET_CENTER","metadata":{"__ref":"ImageMetadata:1*Kla5scB09x_N4ZDsne5hag.png"},"text":"","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"ImageMetadata:1*PYqMT0gmz8dFMtiZvc_7-g.png":{"__typename":"ImageMetadata","id":"1*PYqMT0gmz8dFMtiZvc_7-g.png","originalHeight":294,"originalWidth":566,"focusPercentX":null,"focusPercentY":null,"alt":null},"Paragraph:09f07f1cb22f_22":{"__typename":"Paragraph","id":"09f07f1cb22f_22","name":"bb5a","type":"IMG","href":null,"layout":"INSET_CENTER","metadata":{"__ref":"ImageMetadata:1*PYqMT0gmz8dFMtiZvc_7-g.png"},"text":"Folder structure","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_23":{"__typename":"Paragraph","id":"09f07f1cb22f_23","name":"3b5e","type":"P","href":null,"layout":null,"metadata":null,"text":"But what if we want to use some platform specific Api ?? Lets take a simple example . I want to display version info in the UI, and to get version info, we need to access platform specific Api. Also I need platform specific api to print the logs. Below simple code example will explain how KMP solves this problem.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_24":{"__typename":"Paragraph","id":"09f07f1cb22f_24","name":"52e1","type":"P","href":null,"layout":null,"metadata":null,"text":"Before going through the code , we need to know about expect and actual declarations.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_25":{"__typename":"Paragraph","id":"09f07f1cb22f_25","name":"df28","type":"BQ","href":null,"layout":null,"metadata":null,"text":"In Kotlin Multiplatform, the expect declaration defines a common interface or API that must be implemented in platform-specific code, while the actual declaration provides the platform-specific implementation of that interface or API.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":29,"end":35,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"CODE","start":144,"end":150,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_26":{"__typename":"Paragraph","id":"09f07f1cb22f_26","name":"95fd","type":"P","href":null,"layout":null,"metadata":null,"text":"In commonMain","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":3,"end":13,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":3,"end":13,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_27":{"__typename":"Paragraph","id":"09f07f1cb22f_27","name":"65c6","type":"PRE","href":null,"layout":null,"metadata":null,"text":"expect class Platform {\n val osVersion: String\n fun logSystemInfo()\n}","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_28":{"__typename":"Paragraph","id":"09f07f1cb22f_28","name":"2e62","type":"P","href":null,"layout":null,"metadata":null,"text":"In androidMain","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":3,"end":14,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":3,"end":14,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_29":{"__typename":"Paragraph","id":"09f07f1cb22f_29","name":"e18a","type":"PRE","href":null,"layout":null,"metadata":null,"text":"actual class Platform() {\n actual val osVersion: String\n get() = \"${Build.VERSION.SDK_INT}\"\n\n actual fun logSystemInfo() {\n Log.d(\n \"KMP Android\",\n \"($osName, $osVersion, $deviceModel, $density)\"\n )\n }\n}","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_30":{"__typename":"Paragraph","id":"09f07f1cb22f_30","name":"4f40","type":"P","href":null,"layout":null,"metadata":null,"text":"In iOSMain","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":3,"end":10,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":3,"end":10,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_31":{"__typename":"Paragraph","id":"09f07f1cb22f_31","name":"c7e3","type":"PRE","href":null,"layout":null,"metadata":null,"text":"actual class Platform() {\n actual val osVersion: String\n get() = UIDevice.currentDevice.systemVersion\n\n actual fun logSystemInfo() {\n NSLog(\n \"($osVersion)\"\n )\n }\n}","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_32":{"__typename":"Paragraph","id":"09f07f1cb22f_32","name":"09e1","type":"P","href":null,"layout":null,"metadata":null,"text":"Ok . Now we are done with the Business Logic layer in the arch diagram. Lets continue with other blocks .","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_33":{"__typename":"Paragraph","id":"09f07f1cb22f_33","name":"8652","type":"P","href":null,"layout":null,"metadata":null,"text":"Data layer (network + database) :","hasDropCap":true,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":33,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_34":{"__typename":"Paragraph","id":"09f07f1cb22f_34","name":"202a","type":"P","href":null,"layout":null,"metadata":null,"text":"From the business logic layer , we understood how we can share the business logic across platforms. Sharing the network layer and database layer is even more simple. Ktor networking library supports KMP for network layer and SQLdelight supports KMP for database layer. Both are officially supported and recommended by Jetbrains. This article will not discuss about the network layer and data base layer integrations. This official guide from JetBrains provides the integration details.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"A","start":166,"end":170,"href":"https:\u002F\u002Fktor.io\u002Fdocs\u002Fclient-create-multiplatform-application.html","anchorType":"LINK","userId":null,"linkMetadata":null},{"__typename":"Markup","type":"A","start":225,"end":235,"href":"https:\u002F\u002Fwww.jetbrains.com\u002Fhelp\u002Fkotlin-multiplatform-dev\u002Fmultiplatform-ktor-sqldelight.html","anchorType":"LINK","userId":null,"linkMetadata":null},{"__typename":"Markup","type":"A","start":422,"end":437,"href":"https:\u002F\u002Fwww.jetbrains.com\u002Fhelp\u002Fkotlin-multiplatform-dev\u002Fmultiplatform-ktor-sqldelight.html","anchorType":"LINK","userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_35":{"__typename":"Paragraph","id":"09f07f1cb22f_35","name":"ebb6","type":"P","href":null,"layout":null,"metadata":null,"text":"How does KMP work ?","hasDropCap":true,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"ImageMetadata:1*HHpkFBGyuXjTP3QRzT1iuA.png":{"__typename":"ImageMetadata","id":"1*HHpkFBGyuXjTP3QRzT1iuA.png","originalHeight":198,"originalWidth":184,"focusPercentX":null,"focusPercentY":null,"alt":null},"Paragraph:09f07f1cb22f_36":{"__typename":"Paragraph","id":"09f07f1cb22f_36","name":"9f4f","type":"IMG","href":null,"layout":"INSET_CENTER","metadata":{"__ref":"ImageMetadata:1*HHpkFBGyuXjTP3QRzT1iuA.png"},"text":"","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_37":{"__typename":"Paragraph","id":"09f07f1cb22f_37","name":"6e58","type":"P","href":null,"layout":null,"metadata":null,"text":"So far we have seen what all KMP offers us. But how is all this working , kotlin is just a language right ? and how it is offering all these. So, here we need to know about kotlin\u002Fnative .","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":173,"end":186,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_38":{"__typename":"Paragraph","id":"09f07f1cb22f_38","name":"419f","type":"BQ","href":null,"layout":null,"metadata":null,"text":"Kotlin\u002FNative is a technology for compiling Kotlin code to native binaries which can run without a virtual machine.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":13,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_39":{"__typename":"Paragraph","id":"09f07f1cb22f_39","name":"3f00","type":"P","href":null,"layout":null,"metadata":null,"text":"So all the kotlin code is converted to native binaries and then be used during execution. It also generates .knmfiles. .knm files are Kotlin Native Metadata files that contain information about Kotlin symbols and their interoperability with Swift or Objective-C, enabling seamless integration of Kotlin code with iOS applications.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":108,"end":112,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"CODE","start":119,"end":123,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_40":{"__typename":"Paragraph","id":"09f07f1cb22f_40","name":"af14","type":"P","href":null,"layout":null,"metadata":null,"text":"Q) So everything looks fine so far. Then what are the difficulties in KMP. Everything is smooth here.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":2,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"ImageMetadata:1*IXMBFAM64506EYoc7j1G1A.png":{"__typename":"ImageMetadata","id":"1*IXMBFAM64506EYoc7j1G1A.png","originalHeight":184,"originalWidth":198,"focusPercentX":null,"focusPercentY":null,"alt":null},"Paragraph:09f07f1cb22f_41":{"__typename":"Paragraph","id":"09f07f1cb22f_41","name":"70df","type":"IMG","href":null,"layout":"INSET_CENTER","metadata":{"__ref":"ImageMetadata:1*IXMBFAM64506EYoc7j1G1A.png"},"text":"","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_42":{"__typename":"Paragraph","id":"09f07f1cb22f_42","name":"2667","type":"P","href":null,"layout":null,"metadata":null,"text":"NO. Like every cross platform tech , KMP integration has its own problems. In android it all goes smooth as everything is in kotlin . But how about iOS ?","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":2,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_43":{"__typename":"Paragraph","id":"09f07f1cb22f_43","name":"e840","type":"ULI","href":null,"layout":null,"metadata":null,"text":"In iOS , swift language has to work with kotlin language. So , I found it difficult to debug when there is problem or a crash.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":87,"end":92,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_44":{"__typename":"Paragraph","id":"09f07f1cb22f_44","name":"5242","type":"ULI","href":null,"layout":null,"metadata":null,"text":"Also , what if the methods of kotlin data layer starts return Flow, a kotlin related observable. Will the iOS swift code can understand that ?","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":62,"end":66,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_45":{"__typename":"Paragraph","id":"09f07f1cb22f_45","name":"0b4f","type":"ULI","href":null,"layout":null,"metadata":null,"text":"Most of the data layer functions are suspend , but swift language does not understand what is a suspend function.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":37,"end":45,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"STRONG","start":112,"end":113,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_46":{"__typename":"Paragraph","id":"09f07f1cb22f_46","name":"1ee5","type":"ULI","href":null,"layout":null,"metadata":null,"text":"Since it also generates native binaries and those are included in .framework, it contributes to size increment in iOS app. In my experience after integrating ktor and sqlDelight , observed around 1 mb size increase.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_47":{"__typename":"Paragraph","id":"09f07f1cb22f_47","name":"9995","type":"P","href":null,"layout":null,"metadata":null,"text":"So how to solve all these problems ? The solution is Swift Kotlin Interface Enhancer, also called as SKIE . This solves the problems mentioned above about flows and suspend. Not just these, SKIE solves the general problems between these two languages.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"A","start":101,"end":105,"href":"https:\u002F\u002Fskie.touchlab.co\u002F","anchorType":"LINK","userId":null,"linkMetadata":null},{"__typename":"Markup","type":"A","start":155,"end":160,"href":"https:\u002F\u002Fskie.touchlab.co\u002Ffeatures\u002Fflows","anchorType":"LINK","userId":null,"linkMetadata":null},{"__typename":"Markup","type":"A","start":165,"end":172,"href":"https:\u002F\u002Fskie.touchlab.co\u002Ffeatures\u002Fsuspend","anchorType":"LINK","userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:09f07f1cb22f_48":{"__typename":"Paragraph","id":"09f07f1cb22f_48","name":"f0a6","type":"P","href":null,"layout":null,"metadata":null,"text":"Hope you have learnt new things about mobile development today !! . 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