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<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><title>React Native | A framework for building native apps using React</title><meta name="viewport" content="width=device-width"><meta property="og:title" content="React Native | A framework for building native apps using React"><meta property="og:type" content="website"><meta property="og:url" content="http://facebook.github.io/react-native/index.html"><meta property="og:image" content="http://facebook.github.io/react-native/img/opengraph.png?2"><meta property="og:description" content="A framework for building native apps using React"><link rel="shortcut icon" href="/react-native/img/favicon.png?2"><link rel="stylesheet" href="/react-native/css/react-native.css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><div class="container"><div class="nav-main"><div class="wrap"><a class="nav-home" href="/react-native/"><img src="/react-native/img/header_logo.png">React Native</a><div class="nav-site-wrapper"><ul class="nav-site nav-site-internal"><li><a href="/react-native/docs/getting-started.html" class="active">Docs</a></li><li><a href="/react-native/support.html" class="">Support</a></li></ul><ul class="nav-site nav-site-external"><li><a href="http://github.com/facebook/react-native" class="">GitHub</a></li><li><a href="http://facebook.github.io/react" class="">React</a></li></ul></div></div></div><section class="content wrap documentationContent"><div class="nav-docs"><div class="nav-docs-section"><h3>Quick Start</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/getting-started.html#content">Getting Started</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/tutorial.html#content">Tutorial</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/videos.html#content">Videos</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/style.html#content">Style</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/gesture-responder-system.html#content">Gesture Responder System</a></li><li><a style="margin-left:0;" class="active" href="/react-native/docs/nativemodulesios.html#content">Native Modules (iOS)</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/linking-libraries.html#content">Linking Libraries</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/debugging.html#content">Debugging</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/testing.html#content">Testing</a></li></ul></div><div class="nav-docs-section"><h3>components</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/activityindicatorios.html#content">ActivityIndicatorIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/datepickerios.html#content">DatePickerIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/image.html#content">Image</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/listview.html#content">ListView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/mapview.html#content">MapView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/navigator.html#content">Navigator</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/navigatorios.html#content">NavigatorIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pickerios.html#content">PickerIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/scrollview.html#content">ScrollView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/sliderios.html#content">SliderIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/switchios.html#content">SwitchIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/tabbarios.html#content">TabBarIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/text.html#content">Text</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/textinput.html#content">TextInput</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablehighlight.html#content">TouchableHighlight</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchableopacity.html#content">TouchableOpacity</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablewithoutfeedback.html#content">TouchableWithoutFeedback</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/view.html#content">View</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/webview.html#content">WebView</a></li></ul></div><div class="nav-docs-section"><h3>apis</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/alertios.html#content">AlertIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/animation.html#content">Animation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appregistry.html#content">AppRegistry</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appstateios.html#content">AppStateIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/asyncstorage.html#content">AsyncStorage</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/cameraroll.html#content">CameraRoll</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/interactionmanager.html#content">InteractionManager</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/layoutanimation.html#content">LayoutAnimation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/linkingios.html#content">LinkingIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/netinfo.html#content">NetInfo</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/panresponder.html#content">PanResponder</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pixelratio.html#content">PixelRatio</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pushnotificationios.html#content">PushNotificationIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/statusbarios.html#content">StatusBarIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/stylesheet.html#content">StyleSheet</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/vibrationios.html#content">VibrationIOS</a></li></ul></div><div class="nav-docs-section"><h3>Polyfills</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/flexbox.html#content">Flexbox</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/geolocation.html#content">Geolocation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/network.html#content">Network</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/timers.html#content">Timers</a></li></ul></div></div><div class="inner-content"><a id="content"></a><h1>Native Modules (iOS)</h1><div><p>Sometimes an app needs access to platform API, and React Native doesn't have a corresponding wrapper yet. Maybe you want to reuse some existing Objective-C or C++ code without having to reimplement it in JavaScript. Or write some high performance, multi-threaded code such as image processing, network stack, database or rendering.</p><p>We designed React Native such that it is possible for you to write real native code and have access to the full power of the platform. This is a more advanced feature and we don't expect it to be part of the usual development process, however it is essential that it exists. If React Native doesn't support a native feature that you need, you should be able to build it yourself.</p><p>This is a more advanced guide that shows how to build a native module. It assumes the reader knows Objective-C (Swift is not supported yet) and core libraries (Foundation, UIKit).</p><h2><a class="anchor" name="ios-calendar-module-example"></a>iOS Calendar module example <a class="hash-link" href="#ios-calendar-module-example">#</a></h2><p>This guide will use <a href="https://developer.apple.com/library/mac/documentation/DataManagement/Conceptual/EventKitProgGuide/Introduction/Introduction.html" target="_blank">iOS Calendar API</a> example. Let's say we would like to be able to access iOS calendar from JavaScript.</p><p>Native module is just an Objectve-C class that implements <code>RCTBridgeModule</code> protocol. If you are wondering, RCT is a shorthand for ReaCT.</p><div class="prism language-javascript"><span class="token comment" spellcheck="true">// CalendarManager.h
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</span>#import <span class="token string">"RCTBridgeModule.h"</span>
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@interface <span class="token class-name">CalendarManager</span> <span class="token punctuation">:</span> NSObject <RCTBridgeModule<span class="token operator">></span>
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@end</div><p>React Native will not expose any methods of <code>CalendarManager</code> to JavaScript unless explicitly asked. Fortunately this is pretty easy with <code>RCT_EXPORT</code>:</p><div class="prism language-javascript"><span class="token comment" spellcheck="true">// CalendarManager.m
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</span>@implementation CalendarManager
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<span class="token operator">-</span> <span class="token punctuation">(</span>void<span class="token punctuation">)</span>addEventWithName<span class="token punctuation">:</span><span class="token punctuation">(</span>NSString <span class="token operator">*</span><span class="token punctuation">)</span>name location<span class="token punctuation">:</span><span class="token punctuation">(</span>NSString <span class="token operator">*</span><span class="token punctuation">)</span>location
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<span class="token punctuation">{</span>
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<span class="token function">RCT_EXPORT<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">RCTLogInfo<span class="token punctuation">(</span></span>@<span class="token string">"Pretending to create an event %@ at %@"</span><span class="token punctuation">,</span> name<span class="token punctuation">,</span> location<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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@end</div><p>Now from your JavaScript file you can call the method like this:</p><div class="prism language-javascript"><span class="token keyword">var</span> CalendarManager <span class="token operator">=</span> <span class="token function">require<span class="token punctuation">(</span></span><span class="token string">'NativeModules'</span><span class="token punctuation">)</span><span class="token punctuation">.</span>CalendarManager<span class="token punctuation">;</span>
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CalendarManager<span class="token punctuation">.</span><span class="token function">addEventWithName<span class="token punctuation">(</span></span><span class="token string">'Birthday Party'</span><span class="token punctuation">,</span> <span class="token string">'4 Privet Drive, Surrey'</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div><p>Notice that the exported method name was generated from first part of Objective-C selector. Sometimes it results in a non-idiomatic JavaScript name (like the one in our example). You can change the name by supplying an optional argument to <code>RCT_EXPORT</code>, e.g. <code>RCT_EXPORT(addEvent)</code>.</p><p>The return type of the method should always be <code>void</code>. React Native bridge is asynchronous, so the only way to pass result to JavaScript is by using callbacks or emitting events (see below).</p><h2><a class="anchor" name="argument-types"></a>Argument types <a class="hash-link" href="#argument-types">#</a></h2><p>React Native supports several types of arguments that can be passed from JavaScript code to native module:</p><ul><li>string (<code>NSString</code>)</li><li>number (<code>NSInteger</code>, <code>float</code>, <code>double</code>, <code>CGFloat</code>, <code>NSNumber</code>)</li><li>boolean (<code>BOOL</code>, <code>NSNumber</code>)</li><li>array (<code>NSArray</code>) of any types from this list</li><li>map (<code>NSDictionary</code>) with string keys and values of any type from this list</li><li>function (<code>RCTResponseSenderBlock</code>)</li></ul><p>In our <code>CalendarManager</code> example, if we want to pass event date to native, we have to convert it to a string or a number:</p><div class="prism language-javascript"><span class="token operator">-</span> <span class="token punctuation">(</span>void<span class="token punctuation">)</span>addEventWithName<span class="token punctuation">:</span><span class="token punctuation">(</span>NSString <span class="token operator">*</span><span class="token punctuation">)</span>name location<span class="token punctuation">:</span><span class="token punctuation">(</span>NSString <span class="token operator">*</span><span class="token punctuation">)</span>location date<span class="token punctuation">:</span><span class="token punctuation">(</span>NSInteger<span class="token punctuation">)</span>secondsSinceUnixEpoch
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<span class="token punctuation">{</span>
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<span class="token function">RCT_EXPORT<span class="token punctuation">(</span></span>addEvent<span class="token punctuation">)</span><span class="token punctuation">;</span>
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NSDate <span class="token operator">*</span>date <span class="token operator">=</span> <span class="token punctuation">[</span>NSDate dateWithTimeIntervalSince1970<span class="token punctuation">:</span>secondsSinceUnixEpoch<span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span></div><p>As <code>CalendarManager.addEvent</code> method gets more and more complex, the number of arguments will grow. Some of them might be optional. In this case it's worth considering changing the API a little bit to accept a dictionary of event attributes, like this:</p><div class="prism language-javascript"><span class="token operator">-</span> <span class="token punctuation">(</span>void<span class="token punctuation">)</span>addEventWithName<span class="token punctuation">:</span><span class="token punctuation">(</span>NSString <span class="token operator">*</span><span class="token punctuation">)</span>name details<span class="token punctuation">:</span><span class="token punctuation">(</span>NSDictionary <span class="token operator">*</span><span class="token punctuation">)</span>details
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<span class="token punctuation">{</span>
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<span class="token function">RCT_EXPORT<span class="token punctuation">(</span></span>addEvent<span class="token punctuation">)</span><span class="token punctuation">;</span>
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NSString <span class="token operator">*</span>location <span class="token operator">=</span> <span class="token punctuation">[</span>RCTConvert NSString<span class="token punctuation">:</span>details<span class="token punctuation">[</span>@<span class="token string">"location"</span><span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true"> // ensure location is a string
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</span> <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
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<span class="token punctuation">}</span></div><p>and call it from JavaScript:</p><div class="prism language-javascript">CalendarManager<span class="token punctuation">.</span><span class="token function">addEvent<span class="token punctuation">(</span></span><span class="token string">'Birthday Party'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
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location<span class="token punctuation">:</span> <span class="token string">'4 Privet Drive, Surrey'</span><span class="token punctuation">,</span>
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time<span class="token punctuation">:</span> date<span class="token punctuation">.</span><span class="token function">toTime<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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description<span class="token punctuation">:</span> <span class="token string">'...'</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span></div><blockquote><p><strong>NOTE</strong>: About array and map</p><p>React Native doesn't provide any guarantees about the types of values in these structures. Your native module might expect array of strings, but if JavaScript calls your method with an array that contains number and string you'll get <code>NSArray</code> with <code>NSNumber</code> and <code>NSString</code>. It's the developer's responsibility to check array/map values types (see <a href="https://github.com/facebook/react-native/blob/master/React/Base/RCTConvert.h" target="_blank"><code>RCTConvert</code></a> for helper methods).</p></blockquote><h1><a class="anchor" name="callbacks"></a>Callbacks <a class="hash-link" href="#callbacks">#</a></h1><blockquote><p><strong>WARNING</strong></p><p>This section is even more experimental than others, we don't have a set of best practices around callbacks yet.</p></blockquote><p>Native module also supports a special kind of argument - callback. In most cases it is used to provide function call result to JavaScript.</p><div class="prism language-javascript"><span class="token operator">-</span> <span class="token punctuation">(</span>void<span class="token punctuation">)</span>findEvents<span class="token punctuation">:</span><span class="token punctuation">(</span>RCTResponseSenderBlock<span class="token punctuation">)</span>callback
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<span class="token punctuation">{</span>
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<span class="token function">RCT_EXPORT<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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NSArray <span class="token operator">*</span>events <span class="token operator">=</span> <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
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<span class="token function">callback<span class="token punctuation">(</span></span>@<span class="token punctuation">[</span><span class="token punctuation">[</span>NSNull <span class="token keyword">null</span><span class="token punctuation">]</span><span class="token punctuation">,</span> events<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span></div><p><code>RCTResponseSenderBlock</code> accepts only one argument - array of arguments to pass to JavaScript callback. In this case we use node's convention to set first argument to error and the rest - to the result of the function.</p><div class="prism language-javascript">CalendarManager<span class="token punctuation">.</span><span class="token function">findEvents<span class="token punctuation">(</span></span><span class="token punctuation">(</span>error<span class="token punctuation">,</span> events<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>error<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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console<span class="token punctuation">.</span><span class="token function">error<span class="token punctuation">(</span></span>error<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState<span class="token punctuation">(</span></span><span class="token punctuation">{</span>events<span class="token punctuation">:</span> events<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span></div><p>Native module is supposed to invoke callback only once. It can, however, store the callback as an ivar and invoke it later. This pattern is often used to wrap iOS APIs that require delegate. See <a href="https://github.com/facebook/react-native/blob/master/React/Modules/RCTAlertManager.m" target="_blank"><code>RCTAlertManager</code></a>.</p><p>If you want to pass error-like object to JavaScript, use <code>RCTMakeError</code> from <a href="https://github.com/facebook/react-native/blob/master/React/Base/RCTUtils.h" target="_blank"><code>RCTUtils.h</code></a>.</p><h2><a class="anchor" name="implementing-native-module"></a>Implementing native module <a class="hash-link" href="#implementing-native-module">#</a></h2><p>The native module should not have any assumptions about what thread it is being called on. React Native invokes native modules methods on a separate serial GCD queue, but this is an implementation detail and might change. If the native module needs to call main-thread-only iOS API, it should schedule the operation on the main queue:</p><div class="prism language-javascript"><span class="token operator">-</span> <span class="token punctuation">(</span>void<span class="token punctuation">)</span>addEventWithName<span class="token punctuation">:</span><span class="token punctuation">(</span>NSString <span class="token operator">*</span><span class="token punctuation">)</span>name callback<span class="token punctuation">:</span><span class="token punctuation">(</span>RCTResponseSenderBlock<span class="token punctuation">)</span>callback
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<span class="token punctuation">{</span>
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<span class="token function">RCT_EXPORT<span class="token punctuation">(</span></span>addEvent<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">dispatch_async<span class="token punctuation">(</span></span><span class="token function">dispatch_get_main_queue<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token operator">^</span><span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // Call iOS API on main thread
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</span> <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
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<span class="token comment" spellcheck="true"> // You can invoke callback from any thread/queue
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</span> <span class="token function">callback<span class="token punctuation">(</span></span>@<span class="token punctuation">[</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span></div><p>The same way if the operation can take a long time to complete, the native module should not block. It is a good idea to use <code>dispatch_async</code> to schedule expensive work on background queue.</p><h2><a class="anchor" name="exporting-constants"></a>Exporting constants <a class="hash-link" href="#exporting-constants">#</a></h2><p>Native module can export constants that are instantly available to JavaScript at runtime. This is useful to export some initial data that would otherwise require a bridge round-trip.</p><div class="prism language-javascript"><span class="token operator">-</span> <span class="token punctuation">(</span>NSDictionary <span class="token operator">*</span><span class="token punctuation">)</span>constantsToExport
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<span class="token punctuation">{</span>
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<span class="token keyword">return</span> @<span class="token punctuation">{</span> @<span class="token string">"firstDayOfTheWeek"</span><span class="token punctuation">:</span> @<span class="token string">"Monday"</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span></div><p>JavaScript can use this value right away:</p><div class="prism language-javascript">console<span class="token punctuation">.</span><span class="token function">log<span class="token punctuation">(</span></span>CalendarManager<span class="token punctuation">.</span>firstDayOfTheWeek<span class="token punctuation">)</span><span class="token punctuation">;</span></div><p>Note that the constants are exported only at initialization time, so if you change <code>constantsToExport</code> value at runtime it won't affect JavaScript environment.</p><h2><a class="anchor" name="sending-events-to-javascript"></a>Sending events to JavaScript <a class="hash-link" href="#sending-events-to-javascript">#</a></h2><p>The native module can signal events to JavaScript without being invoked directly. The easiest way to do this is to use <code>eventDispatcher</code>:</p><div class="prism language-javascript"><span class="token operator">-</span> <span class="token punctuation">(</span>void<span class="token punctuation">)</span>calendarEventReminderReceived<span class="token punctuation">:</span><span class="token punctuation">(</span>NSNotification <span class="token operator">*</span><span class="token punctuation">)</span>notification
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<span class="token punctuation">{</span>
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NSString <span class="token operator">*</span>eventName <span class="token operator">=</span> notification<span class="token punctuation">.</span>userInfo<span class="token punctuation">[</span>@<span class="token string">"name"</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token punctuation">[</span>self<span class="token punctuation">.</span>bridge<span class="token punctuation">.</span>eventDispatcher sendAppEventWithName<span class="token punctuation">:</span>@<span class="token string">"EventReminder"</span>
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body<span class="token punctuation">:</span>@<span class="token punctuation">{</span>@<span class="token string">"name"</span><span class="token punctuation">:</span> eventName<span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span></div><p>JavaScript code can subscribe to these events:</p><div class="prism language-javascript"><span class="token keyword">var</span> subscription <span class="token operator">=</span> DeviceEventEmitter<span class="token punctuation">.</span><span class="token function">addListener<span class="token punctuation">(</span></span>
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<span class="token string">'EventReminder'</span><span class="token punctuation">,</span>
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