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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Platform Specific Code · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="When building a cross-platform app, you'll want to re-use as much code as possible. Scenarios may arise where it makes sense for the code to be different, for example you may want to implement separate visual components for iOS and Android."/><meta name="docsearch:version" content="0.10"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Platform Specific Code · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/index.html"/><meta property="og:description" content="When building a cross-platform app, you'll want to re-use as much code as possible. Scenarios may arise where it makes sense for the code to be different, for example you may want to implement separate visual components for iOS and Android."/><meta name="twitter:card" content="summary"/><link rel="shortcut icon" href="/react-native/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://facebook.github.io/react-native/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/react-native/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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Apps</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/running-on-device">Running On Device</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/upgrading">Upgrading to new React Native versions</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/troubleshooting">Troubleshooting</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/native-modules-setup">Native Modules Setup</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Guides (iOS)</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/native-modules-ios">Native Modules</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/native-components-ios">Native UI Components</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/linking-libraries-ios">Linking Libraries</a></li><li class="navListItem"><a class="navItem" 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class="navGroupCategoryTitle">Components</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/datepickerios">DatePickerIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/image">Image</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/modal">Modal</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/navigator">Navigator (Legacy Custom Component)</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/navigatorios">NavigatorIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/progressviewios">ProgressViewIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/scrollview">ScrollView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/segmentedcontrolios">SegmentedControlIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/tabbarios">TabBarIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/tabbarios-item">TabBarIOS.Item</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/text">Text</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/textinput">TextInput</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/touchablehighlight">TouchableHighlight</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/touchableopacity">TouchableOpacity</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/touchablewithoutfeedback">TouchableWithoutFeedback</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/webview">WebView</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">APIs</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/actionsheetios">ActionSheetIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/cameraroll">CameraRoll</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/dimensions">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/geolocation">Geolocation</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/image-style-props">Image Style Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/interactionmanager">InteractionManager</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/layout-props">Layout Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/netinfo">NetInfo</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/pixelratio">PixelRatio</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/pushnotificationios">PushNotificationIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/settings">Settings</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/statusbarios">StatusBarIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/stylesheet">StyleSheet</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/text-style-props">Text Style Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/transforms">Transforms</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/vibrationios">VibrationIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.10/view-style-props">View Style Props</a></li></ul></div></div></section></div><script>
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</script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/platform-specific-code.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Platform Specific Code</h1></header><article><div><span><p>When building a cross-platform app, you'll want to re-use as much code as possible. Scenarios may arise where it makes sense for the code to be different, for example you may want to implement separate visual components for iOS and Android.</p>
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||
<p>React Native provides two ways to easily organize your code and separate it by platform:</p>
|
||
<ul>
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||
<li>Using the <a href="/react-native/docs/0.10/platform-specific-code#platform-module"><code>Platform</code> module</a>.</li>
|
||
<li>Using <a href="/react-native/docs/0.10/platform-specific-code#platform-specific-extensions">platform-specific file extensions</a>.</li>
|
||
</ul>
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||
<p>Certain components may have properties that work on one platform only. All of these props are annotated with <code>@platform</code> and have a small badge next to them on the website.</p>
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||
<h2><a class="anchor" aria-hidden="true" id="platform-module"></a><a href="#platform-module" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Platform module</h2>
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||
<p>React Native provides a module that detects the platform in which the app is running. You can use the detection logic to implement platform-specific code. Use this option when only small parts of a component are platform-specific.</p>
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||
<pre><code class="hljs css languages- javascript"><span class="hljs-keyword">import</span> {Platform, StyleSheet} <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
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<span class="hljs-keyword">const</span> styles = StyleSheet.create({
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||
<span class="hljs-attr">height</span>: Platform.OS === <span class="hljs-string">'ios'</span> ? <span class="hljs-number">200</span> : <span class="hljs-number">100</span>,
|
||
});
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||
</code></pre>
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<p><code>Platform.OS</code> will be <code>ios</code> when running on iOS and <code>android</code> when running on Android.</p>
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<p>There is also a <code>Platform.select</code> method available, that given an object containing Platform.OS as keys, returns the value for the platform you are currently running on.</p>
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<pre><code class="hljs css languages- javascript"><span class="hljs-keyword">import</span> {Platform, StyleSheet} <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
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<span class="hljs-keyword">const</span> styles = StyleSheet.create({
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<span class="hljs-attr">container</span>: {
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<span class="hljs-attr">flex</span>: <span class="hljs-number">1</span>,
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...Platform.select({
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<span class="hljs-attr">ios</span>: {
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||
<span class="hljs-attr">backgroundColor</span>: <span class="hljs-string">'red'</span>,
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||
},
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<span class="hljs-attr">android</span>: {
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<span class="hljs-attr">backgroundColor</span>: <span class="hljs-string">'blue'</span>,
|
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},
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||
}),
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},
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||
});
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||
</code></pre>
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<p>This will result in a container having <code>flex: 1</code> on both platforms, a red background color on iOS, and a blue background color on Android.</p>
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<p>Since it accepts <code>any</code> value, you can also use it to return platform specific component, like below:</p>
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<pre><code class="hljs css languages- javascript"><span class="hljs-keyword">const</span> Component = Platform.select({
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<span class="hljs-attr">ios</span>: <span class="hljs-function"><span class="hljs-params">()</span> =></span> <span class="hljs-built_in">require</span>(<span class="hljs-string">'ComponentIOS'</span>),
|
||
<span class="hljs-attr">android</span>: <span class="hljs-function"><span class="hljs-params">()</span> =></span> <span class="hljs-built_in">require</span>(<span class="hljs-string">'ComponentAndroid'</span>),
|
||
})();
|
||
|
||
<span class="xml"><span class="hljs-tag"><<span class="hljs-name">Component</span> /></span>;
|
||
</span></code></pre>
|
||
<h3><a class="anchor" aria-hidden="true" id="detecting-the-android-version"></a><a href="#detecting-the-android-version" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Detecting the Android version</h3>
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||
<p>On Android, the <code>Platform</code> module can also be used to detect the version of the Android Platform in which the app is running:</p>
|
||
<pre><code class="hljs css languages- javascript"><span class="hljs-keyword">import</span> {Platform} <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
|
||
|
||
<span class="hljs-keyword">if</span> (Platform.Version === <span class="hljs-number">25</span>) {
|
||
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">'Running on Nougat!'</span>);
|
||
}
|
||
</code></pre>
|
||
<h3><a class="anchor" aria-hidden="true" id="detecting-the-ios-version"></a><a href="#detecting-the-ios-version" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Detecting the iOS version</h3>
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||
<p>On iOS, the <code>Version</code> is a result of <code>-[UIDevice systemVersion]</code>, which is a string with the current version of the operating system. An example of the system version is "10.3". For example, to detect the major version number on iOS:</p>
|
||
<pre><code class="hljs css languages- javascript"><span class="hljs-keyword">import</span> {Platform} <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
|
||
|
||
<span class="hljs-keyword">const</span> majorVersionIOS = <span class="hljs-built_in">parseInt</span>(Platform.Version, <span class="hljs-number">10</span>);
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||
<span class="hljs-keyword">if</span> (majorVersionIOS <= <span class="hljs-number">9</span>) {
|
||
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">'Work around a change in behavior'</span>);
|
||
}
|
||
</code></pre>
|
||
<h2><a class="anchor" aria-hidden="true" id="platform-specific-extensions"></a><a href="#platform-specific-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Platform-specific extensions</h2>
|
||
<p>When your platform-specific code is more complex, you should consider splitting the code out into separate files. React Native will detect when a file has a <code>.ios.</code> or <code>.android.</code> extension and load the relevant platform file when required from other components.</p>
|
||
<p>For example, say you have the following files in your project:</p>
|
||
<pre><code class="hljs css languages- sh">BigButton.ios.js
|
||
BigButton.android.js
|
||
</code></pre>
|
||
<p>You can then require the component as follows:</p>
|
||
<pre><code class="hljs css languages- javascript"><span class="hljs-keyword">const</span> BigButton = <span class="hljs-built_in">require</span>(<span class="hljs-string">'./BigButton'</span>);
|
||
</code></pre>
|
||
<p>React Native will automatically pick up the right file based on the running platform.</p>
|
||
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