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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 | Build Native Apps Using React</title><meta name="viewport" content="width=device-width"><meta property="og:title" content="React Native | Build 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="Build 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><ul class="nav-site"><li><a href="/react-native/docs/getting-started.html#content" class="active">docs</a></li><li><a href="/react-native/support.html" class="">support</a></li><li><a href="http://facebook.github.io/react" class="">react</a></li><li><a href="http://github.com/facebook/react-native" class="">github</a></li></ul></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="active" 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="" href="/react-native/docs/nativemodulesios.html#content">Native Modules (iOS)</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/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/reactnavigator.html#content">ReactNavigator</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/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>Tutorial</h1><div><h2><a class="anchor" name="preface"></a>Preface <a class="hash-link" href="#preface">#</a></h2><p>This is a tutorial that aims to get you up to speed with writing iOS apps using React Native. If you want to learn what React Native is and why Facebook built it, check out this blog post: <strong>[INSERT BLOG POST URL]</strong>.</p><p>We assume you have experience writing websites with React. If not, you can learn about React <a href="http://facebook.github.io/react/" target="_blank">here</a>.</p><h2><a class="anchor" name="setup"></a>Setup <a class="hash-link" href="#setup">#</a></h2><p>React Native has a few requirements which you can find on the <a href="https://github.com/facebook/react-native#requirements" target="_blank">github page</a> (specifically OSX, Xcode, Homebrew, node, npm, watchman, and (optionally) flow)</p><p>After installing these dependencies there are two simple commands to get a React Native project all set up for development.</p><ol><li><p><code>npm install -g react-native-cli</code></p><p> <code>react-native-cli</code> is a command line interface that does the rest of the set up. It’s also an npm module so you can get it very easily. This will install <code>react-native-cli</code> so you can run it as a command in your terminal. You only need to do this once ever.</p></li><li><p><code>react-native init AwesomeProject</code></p><p> This command fetches the React Native source code, installs all of the other npm modules that it depends on, and creates a new Xcode project in <code>AwesomeProject/AwesomeProject.xcodeproj</code>.</p></li></ol><h2><a class="anchor" name="development"></a>Development <a class="hash-link" href="#development">#</a></h2><p>You can now open this new project (<code>AwesomeProject/AwesomeProject.xcodeproj</code>) in Xcode and simply build and run it with cmd+R. Doing so will start a node server which enables live code reloading by packaging and serving the latest JS bundle to the simulator at runtime. From here out you can see your changes by pressing cmd+R in the simulator rather than recompiling in Xcode.</p><p>For this tutorial let’s build a simple version of the Movies app that fetches 25 movies that are in theaters and displays them in a ListView.</p><h3><a class="anchor" name="hello-world"></a>Hello World <a class="hash-link" href="#hello-world">#</a></h3><p><code>react-native init</code> will copy <code>Examples/SampleProject</code> to whatever you named your project, in this case AwesomeProject. This is a simple hello world app. You can edit <code>index.ios.js</code> to make changes to the app and then press cmd+R in the simulator to see your changes.</p><h3><a class="anchor" name="mocking-data"></a>Mocking data <a class="hash-link" href="#mocking-data">#</a></h3><p>Before we write the code to fetch actual Rotten Tomatoes data, let&#x27;s mock some data so we can get started with rendering some views right away. At Facebook we typically declare constants at the top of JS files just below the requires but feel free to add the following constant wherever you like:</p><div class="prism language-javascript"><span class="token keyword">var</span> MOCKED_MOVIES_DATA <span class="token operator">=</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>title<span class="token punctuation">:</span> <span class="token string">&#x27;Title&#x27;</span><span class="token punctuation">,</span> year<span class="token punctuation">:</span> <span class="token string">&#x27;2015&#x27;</span><span class="token punctuation">,</span> posters<span class="token punctuation">:</span> <span class="token punctuation">{</span>thumbnail<span class="token punctuation">:</span> <span class="token string">&#x27;http://resizing.flixster.com/yDGJbDZ4tOk8Wsfl2Ljt1JYgHpk=/53x81/dkpu1ddg7pbsk.cloudfront.net/movie/11/18/90/11189059_ori.jpg&#x27;</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></div><h3><a class="anchor" name="render-a-movie"></a>Render a movie <a class="hash-link" href="#render-a-movie">#</a></h3><p>We&#x27;re going to render the title, year, and thumbnail for the movie. Since we want to render an image, which is an Image component in React Native, add Image to the list of React requires above.</p><div class="prism language-javascript"><span class="token keyword">var</span> <span class="token punctuation">{</span>
AppRegistry<span class="token punctuation">,</span>
Image<span class="token punctuation">,</span>
StyleSheet<span class="token punctuation">,</span>
Text<span class="token punctuation">,</span>
View<span class="token punctuation">,</span>
<span class="token punctuation">}</span> <span class="token operator">=</span> React<span class="token punctuation">;</span></div><p>Now change the render function so that we&#x27;re rendering the stuff mentioned above rather than hello world.</p><div class="prism language-javascript"> render<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">var</span> movie <span class="token operator">=</span> MOCKED_MOVIES_DATA<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>container<span class="token punctuation">}</span><span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span><span class="token punctuation">{</span>movie<span class="token punctuation">.</span>title<span class="token punctuation">}</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span><span class="token punctuation">{</span>movie<span class="token punctuation">.</span>year<span class="token punctuation">}</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;Image source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>uri<span class="token punctuation">:</span> movie<span class="token punctuation">.</span>posters<span class="token punctuation">.</span>thumbnail<span class="token punctuation">}</span><span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span></div><p>Press cmd+R and you should see &quot;Title&quot; sitting above &quot;2015&quot;. Notice that the Image doesn&#x27;t render anything. This is because we haven&#x27;t specified the width and height of the image we want to render. You do that via styles. While we&#x27;re changing the styles let&#x27;s also clean up the styles we&#x27;re no longer using.</p><div class="prism language-javascript"><span class="token keyword">var</span> styles <span class="token operator">=</span> StyleSheet<span class="token punctuation">.</span><span class="token function">create<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
container<span class="token punctuation">:</span> <span class="token punctuation">{</span>
flex<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
justifyContent<span class="token punctuation">:</span> <span class="token string">&#x27;center&#x27;</span><span class="token punctuation">,</span>
alignItems<span class="token punctuation">:</span> <span class="token string">&#x27;center&#x27;</span><span class="token punctuation">,</span>
backgroundColor<span class="token punctuation">:</span> <span class="token string">&#x27;#F5FCFF&#x27;</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
thumbnail<span class="token punctuation">:</span> <span class="token punctuation">{</span>
width<span class="token punctuation">:</span> <span class="token number">53</span><span class="token punctuation">,</span>
height<span class="token punctuation">:</span> <span class="token number">81</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></div><p>And lastly we need to apply this still to the Image component:</p><div class="prism language-javascript"> &lt;Image
source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>uri<span class="token punctuation">:</span> movie<span class="token punctuation">.</span>posters<span class="token punctuation">.</span>thumbnail<span class="token punctuation">}</span><span class="token punctuation">}</span>
style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>thumbnail<span class="token punctuation">}</span>
<span class="token operator">/</span><span class="token operator">&gt;</span></div><p>Press cmd+R and the image should now render.</p><p>Screenshot:</p><p>&lt;img src=&quot;https://github.com/facebook/react-native/raw/master/docs/images/TutorialMock.png&quot; alt=&quot;screenshot&quot; width=&quot;320px&quot; /&gt;</p><h3><a class="anchor" name="add-some-styling"></a>Add some styling <a class="hash-link" href="#add-some-styling">#</a></h3><p>Great, we&#x27;ve rendered our data, now let&#x27;s make it look better. I&#x27;d like to put the text to the right of the image and make the title larger and centered within that area:</p><div class="prism language-javascript"><span class="token operator">+-</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">+</span>
<span class="token operator">|</span><span class="token operator">+-</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">++</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">+</span><span class="token operator">|</span>
<span class="token operator">||</span> <span class="token operator">||</span> Title <span class="token operator">||</span>
<span class="token operator">||</span> Image <span class="token operator">||</span> <span class="token operator">||</span>
<span class="token operator">||</span> <span class="token operator">||</span> Year <span class="token operator">||</span>
<span class="token operator">|</span><span class="token operator">+-</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">++</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">+</span><span class="token operator">|</span>
<span class="token operator">+-</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">+</span></div><p>Since we&#x27;ve got some components layed out horizontally and some components layed out vertically, we&#x27;ll need to add another container around the Texts.</p><div class="prism language-javascript"> <span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>container<span class="token punctuation">}</span><span class="token operator">&gt;</span>
&lt;Image
source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>uri<span class="token punctuation">:</span> movie<span class="token punctuation">.</span>posters<span class="token punctuation">.</span>thumbnail<span class="token punctuation">}</span><span class="token punctuation">}</span>
style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>thumbnail<span class="token punctuation">}</span>
<span class="token operator">/</span><span class="token operator">&gt;</span>
&lt;View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>rightContainer<span class="token punctuation">}</span><span class="token operator">&gt;</span>
&lt;Text style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>title<span class="token punctuation">}</span><span class="token operator">&gt;</span><span class="token punctuation">{</span>movie<span class="token punctuation">.</span>title<span class="token punctuation">}</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;Text style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>year<span class="token punctuation">}</span><span class="token operator">&gt;</span><span class="token punctuation">{</span>movie<span class="token punctuation">.</span>year<span class="token punctuation">}</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span></div><p>Not too much has changed, we added a container around the Texts and then moved them after the Image (because they&#x27;re to the right of the Image). Let&#x27;s see what the style changes look like:</p><div class="prism language-javascript"> container<span class="token punctuation">:</span> <span class="token punctuation">{</span>
flex<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
flexDirection<span class="token punctuation">:</span> <span class="token string">&#x27;row&#x27;</span><span class="token punctuation">,</span>
justifyContent<span class="token punctuation">:</span> <span class="token string">&#x27;center&#x27;</span><span class="token punctuation">,</span>
alignItems<span class="token punctuation">:</span> <span class="token string">&#x27;center&#x27;</span><span class="token punctuation">,</span>
backgroundColor<span class="token punctuation">:</span> <span class="token string">&#x27;#F5FCFF&#x27;</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span></div><p>We simply added <code>flexDirection: &#x27;row&#x27;</code> which means that children are layed out horizontally instead of vertically.</p><div class="prism language-javascript"> rightContainer<span class="token punctuation">:</span> <span class="token punctuation">{</span>
flex<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span></div><p>This means that the rightContainer takes up the remaining space in the parent container that isn&#x27;t taken up by the Image. If this doesn&#x27;t make sense, add a backgroundColor to rightContainer and then try removing the <code>flex: 1</code>. You&#x27;ll see how the container is only the size of its children instead of taking up the remaining space of its parent.</p><div class="prism language-javascript"> title<span class="token punctuation">:</span> <span class="token punctuation">{</span>
fontSize<span class="token punctuation">:</span> <span class="token number">20</span><span class="token punctuation">,</span>
marginBottom<span class="token punctuation">:</span> <span class="token number">8</span><span class="token punctuation">,</span>
textAlign<span class="token punctuation">:</span> <span class="token string">&#x27;center&#x27;</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
year<span class="token punctuation">:</span> <span class="token punctuation">{</span>
textAlign<span class="token punctuation">:</span> <span class="token string">&#x27;center&#x27;</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span></div><p>This is pretty straightforward if you&#x27;ve ever seen CSS before. Make the title larger, add some space below it, and center all of the text within their parent container (rightContainer).</p><p>Go ahead and press cmd+R and you&#x27;ll see the updated view.</p><p>Screenshot:</p><p>&lt;img src=&quot;https://github.com/facebook/react-native/raw/master/docs/images/TutorialStyledMock.png&quot; alt=&quot;screenshot&quot; width=&quot;320px&quot; /&gt;</p><h3><a class="anchor" name="fetching-real-data"></a>Fetching real data <a class="hash-link" href="#fetching-real-data">#</a></h3><p>Fetching data from Rotten Tomatoes&#x27;s API isn&#x27;t really relevant to learning React Native so feel free to breeze through this section.</p><p>Add the following constants to the top of the file (typically below the requires) to create the REQUEST_URL used to request data with.</p><div class="prism language-javascript"><span class="token keyword">var</span> API_KEY <span class="token operator">=</span> <span class="token string">&#x27;7waqfqbprs7pajbz28mqf6vz&#x27;</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> API_URL <span class="token operator">=</span> <span class="token string">&#x27;http://api.rottentomatoes.com/api/public/v1.0/lists/movies/in_theaters.json&#x27;</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> PAGE_SIZE <span class="token operator">=</span> <span class="token number">25</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> PARAMS <span class="token operator">=</span> <span class="token string">&#x27;?apikey=&#x27;</span> <span class="token operator">+</span> API_KEY <span class="token operator">+</span> <span class="token string">&#x27;&amp;page_limit=&#x27;</span> <span class="token operator">+</span> PAGE_SIZE<span class="token punctuation">;</span>
<span class="token keyword">var</span> REQUEST_URL <span class="token operator">=</span> API_URL <span class="token operator">+</span> PARAMS<span class="token punctuation">;</span></div><p>Add some initial state to our application so that we can check this.state.movies === null to determine whether the movies data has been loaded or not. We can set this data when the response comes back with this.setState({movies: moviesData}). Add this code just above the render function inside our React class.</p><div class="prism language-javascript"> getInitialState<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">{</span>
movies<span class="token punctuation">:</span> <span class="token keyword">null</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></div><p>We want to send off the request after the component has finished loading. componentDidMount is a function on React components that React will call exactly once just after the component has been loaded.</p><div class="prism language-javascript"> componentDidMount<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">fetchData<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></div><p>Implement our fetchData function to actually make the request and handle the response. All you need to do is call this.setState({movies: data}) because the way React works is that setState actually triggers a re-render and then the render function will notice that
this.state.movies is no longer null.</p><div class="prism language-javascript"> fetchData<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">fetch<span class="token punctuation">(</span></span>REQUEST_URL<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">then<span class="token punctuation">(</span></span><span class="token punctuation">(</span>response<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> response<span class="token punctuation">.</span><span class="token function">json<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">then<span class="token punctuation">(</span></span><span class="token punctuation">(</span>responseData<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
<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>
movies<span class="token punctuation">:</span> responseData<span class="token punctuation">.</span>movies<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><span class="token function">done<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></div><p>Now modify the render function to render a loading view if we don&#x27;t have any movies data, and to render the first movie otherwise.</p><div class="prism language-javascript"> render<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>movies<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">renderLoadingView<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">var</span> movie <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>movies<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">renderMovie<span class="token punctuation">(</span></span>movie<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
renderLoadingView<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>container<span class="token punctuation">}</span><span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span>
Loading movies<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
renderMovie<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>movie<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>container<span class="token punctuation">}</span><span class="token operator">&gt;</span>
&lt;Image
source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>uri<span class="token punctuation">:</span> movie<span class="token punctuation">.</span>posters<span class="token punctuation">.</span>thumbnail<span class="token punctuation">}</span><span class="token punctuation">}</span>
style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>thumbnail<span class="token punctuation">}</span>
<span class="token operator">/</span><span class="token operator">&gt;</span>
&lt;View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>rightContainer<span class="token punctuation">}</span><span class="token operator">&gt;</span>
&lt;Text style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>title<span class="token punctuation">}</span><span class="token operator">&gt;</span><span class="token punctuation">{</span>movie<span class="token punctuation">.</span>title<span class="token punctuation">}</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;Text style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>year<span class="token punctuation">}</span><span class="token operator">&gt;</span><span class="token punctuation">{</span>movie<span class="token punctuation">.</span>year<span class="token punctuation">}</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span></div><p>Now press cmd+R and you should see &quot;Loading movies...&quot; until the response comes back, then it will render the first movie it fetched from Rotten Tomatoes.</p><p>Screenshot:</p><p>&lt;img src=&quot;https://github.com/facebook/react-native/raw/master/docs/images/TutorialSingleFetched.png&quot; alt=&quot;screenshot&quot; width=&quot;320px&quot; /&gt;</p><h2><a class="anchor" name="listview"></a>ListView <a class="hash-link" href="#listview">#</a></h2><p>Let’s now modify this application to render all of this data in a ListView, rather than just the first movie.</p><p>First thing&#x27;s first, add the ListView require to the top of the file.</p><div class="prism language-javascript"><span class="token keyword">var</span> <span class="token punctuation">{</span>
AppRegistry<span class="token punctuation">,</span>
Image<span class="token punctuation">,</span>
ListView<span class="token punctuation">,</span>
StyleSheet<span class="token punctuation">,</span>
Text<span class="token punctuation">,</span>
View<span class="token punctuation">,</span>
<span class="token punctuation">}</span> <span class="token operator">=</span> React<span class="token punctuation">;</span></div><p>Now modify the render funtion so that once we have our data it renders a ListView of movies instead of a single movie.</p><div class="prism language-javascript"> render<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>loaded<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">renderLoadingView<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;ListView
dataSource<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>dataSource<span class="token punctuation">}</span>
renderRow<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>renderMovie<span class="token punctuation">}</span>
<span class="token operator">/</span><span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span></div><p>You&#x27;ll notice we added a dataSource that comes from this.state. We&#x27;ll now store the data there and then change this.state.movies === null to this.state.loaded === true to check if data has been loaded. Here&#x27;s what getInitialState looks like:</p><div class="prism language-javascript"> getInitialState<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">{</span>
dataSource<span class="token punctuation">:</span> <span class="token keyword">new</span> <span class="token class-name">ListView<span class="token punctuation">.</span>DataSource</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
rowHasChanged<span class="token punctuation">:</span> <span class="token punctuation">(</span>row1<span class="token punctuation">,</span> row2<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> row1 <span class="token operator">!</span><span class="token operator">==</span> row2<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
loaded<span class="token punctuation">:</span> <span class="token boolean">false</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></div><p>And here&#x27;s the modified this.setState in the response handler in fetchData:</p><div class="prism language-javascript"> fetchData<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">fetch<span class="token punctuation">(</span></span>REQUEST_URL<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">then<span class="token punctuation">(</span></span><span class="token punctuation">(</span>response<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> response<span class="token punctuation">.</span><span class="token function">json<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">then<span class="token punctuation">(</span></span><span class="token punctuation">(</span>responseData<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
<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>
dataSource<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>dataSource<span class="token punctuation">.</span><span class="token function">cloneWithRows<span class="token punctuation">(</span></span>responseData<span class="token punctuation">.</span>movies<span class="token punctuation">)</span><span class="token punctuation">,</span>
loaded<span class="token punctuation">:</span> <span class="token boolean">true</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><span class="token function">done<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></div><p>Screenshot:</p><p>&lt;img src=&quot;https://github.com/facebook/react-native/raw/master/docs/images/TutorialFinal.png&quot; alt=&quot;screenshot&quot; width=&quot;320px&quot; /&gt;</p><h3><a class="anchor" name="final-source-code"></a>Final source code <a class="hash-link" href="#final-source-code">#</a></h3><div class="prism language-javascript"><span class="token comment" spellcheck="true">/**
* Sample React Native App
* https://github.com/facebook/react-native
*/</span>
<span class="token string">&#x27;use strict&#x27;</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> React <span class="token operator">=</span> <span class="token function">require<span class="token punctuation">(</span></span><span class="token string">&#x27;react-native&#x27;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> <span class="token punctuation">{</span>
AppRegistry<span class="token punctuation">,</span>
Image<span class="token punctuation">,</span>
ListView<span class="token punctuation">,</span>
StyleSheet<span class="token punctuation">,</span>
Text<span class="token punctuation">,</span>
View<span class="token punctuation">,</span>
<span class="token punctuation">}</span> <span class="token operator">=</span> React<span class="token punctuation">;</span>
<span class="token keyword">var</span> API_KEY <span class="token operator">=</span> <span class="token string">&#x27;7waqfqbprs7pajbz28mqf6vz&#x27;</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> API_URL <span class="token operator">=</span> <span class="token string">&#x27;http://api.rottentomatoes.com/api/public/v1.0/lists/movies/in_theaters.json&#x27;</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> PAGE_SIZE <span class="token operator">=</span> <span class="token number">25</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> PARAMS <span class="token operator">=</span> <span class="token string">&#x27;?apikey=&#x27;</span> <span class="token operator">+</span> API_KEY <span class="token operator">+</span> <span class="token string">&#x27;&amp;page_limit=&#x27;</span> <span class="token operator">+</span> PAGE_SIZE<span class="token punctuation">;</span>
<span class="token keyword">var</span> REQUEST_URL <span class="token operator">=</span> API_URL <span class="token operator">+</span> PARAMS<span class="token punctuation">;</span>
<span class="token keyword">var</span> SampleApp <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">createClass<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
getInitialState<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">{</span>
dataSource<span class="token punctuation">:</span> <span class="token keyword">new</span> <span class="token class-name">ListView<span class="token punctuation">.</span>DataSource</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
rowHasChanged<span class="token punctuation">:</span> <span class="token punctuation">(</span>row1<span class="token punctuation">,</span> row2<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> row1 <span class="token operator">!</span><span class="token operator">==</span> row2<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
loaded<span class="token punctuation">:</span> <span class="token boolean">false</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>
componentDidMount<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">fetchData<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>
fetchData<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">fetch<span class="token punctuation">(</span></span>REQUEST_URL<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">then<span class="token punctuation">(</span></span><span class="token punctuation">(</span>response<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> response<span class="token punctuation">.</span><span class="token function">json<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">then<span class="token punctuation">(</span></span><span class="token punctuation">(</span>responseData<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
<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>
dataSource<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>dataSource<span class="token punctuation">.</span><span class="token function">cloneWithRows<span class="token punctuation">(</span></span>responseData<span class="token punctuation">.</span>movies<span class="token punctuation">)</span><span class="token punctuation">,</span>
loaded<span class="token punctuation">:</span> <span class="token boolean">true</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><span class="token function">done<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>
render<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>loaded<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">renderLoadingView<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;ListView
dataSource<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>dataSource<span class="token punctuation">}</span>
renderRow<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>renderMovie<span class="token punctuation">}</span>
<span class="token operator">/</span><span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
renderLoadingView<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>container<span class="token punctuation">}</span><span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span>
Loading movies<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
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