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<!DOCTYPE html><html><head><title>Animations</title><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta name="viewport" content="width=device-width"><meta property="fb:app_id" content="1677033832619985"><meta property="fb:admins" content="121800083"><meta property="og:site_name" content="React Native"><meta property="og:title" content="Animations"><meta property="og:url" content="https://facebook.github.io/react-native/index.html"><meta property="og:image" content="https://facebook.github.io/react-native/img/opengraph.png"><meta property="og:description" content="A framework for building native apps using React"><meta name="twitter:site" content="@reactnative"><meta name="twitter:card" content="summary_large_image"><meta property="og:type" content="website"><base href="/react-native/"><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"><link rel="shortcut icon" href="img/favicon.png?2"><link rel="stylesheet" href="css/react-native.css"><link rel="alternate" type="application/rss+xml" title="React Native Blog" href="https://facebook.github.io/react-native/blog/feed.xml"><link href="//cdn-images.mailchimp.com/embedcode/horizontal-slim-10_7.css" rel="stylesheet" type="text/css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));</script><script>window.twttr=(function(d,s, id){var js,fjs=d.getElementsByTagName(s)[0],t=window.twttr||{};if(d.getElementById(id))return t;js=d.createElement(s);js.id=id;js.src='https://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js, fjs);t._e = [];t.ready = function(f) {t._e.push(f);};return t;}(document, 'script', 'twitter-wjs'));</script><div class="container"><div class="nav-main"><div class="wrap"><a class="nav-home" href=""><img src="img/header_logo.png">React Native</a><a class="nav-version" href="/react-native/versions.html">0.40</a><div class="nav-site-wrapper"><ul class="nav-site nav-site-internal"><li><a href="docs/getting-started.html" class="active" data-target=".nav-docs">Docs</a></li><li><a href="/react-native/support.html" class="">Help</a></li><li><a href="/react-native/showcase.html" class="">Showcase</a></li><li><a href="/react-native/blog/" class="">Blog</a></li></ul><div class="algolia-search-wrapper"><input id="algolia-doc-search" tabindex="0" type="text" placeholder="Search docs..."></div><ul class="nav-site nav-site-external"><li><a href="https://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-viewport"><div class="nav-docs-section"><h3>The Basics</h3><ul><li><a style="margin-left:0;" class="" href="docs/getting-started.html">Getting Started</a></li><li><a style="margin-left:0;" class="" href="docs/tutorial.html">Tutorial</a></li><li><a style="margin-left:0;" class="" href="docs/props.html">Props</a></li><li><a style="margin-left:0;" class="" href="docs/state.html">State</a></li><li><a style="margin-left:0;" class="" href="docs/style.html">Style</a></li><li><a style="margin-left:0;" class="" href="docs/height-and-width.html">Height and Width</a></li><li><a style="margin-left:0;" class="" href="docs/flexbox.html">Layout with Flexbox</a></li><li><a style="margin-left:0;" class="" href="docs/handling-text-input.html">Handling Text Input</a></li><li><a style="margin-left:0;" class="" href="docs/using-a-scrollview.html">Using a ScrollView</a></li><li><a style="margin-left:0;" class="" href="docs/using-a-listview.html">Using a ListView</a></li><li><a style="margin-left:0;" class="" href="docs/network.html">Networking</a></li><li><a style="margin-left:0;" class="" href="docs/using-navigators.html">Using Navigators</a></li><li><a style="margin-left:0;" class="" href="docs/more-resources.html">More Resources</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:0;" class="" href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a></li><li><a style="margin-left:0;" class="" href="docs/colors.html">Colors</a></li><li><a style="margin-left:0;" class="" href="docs/images.html">Images</a></li><li><a style="margin-left:0;" class="" href="docs/handling-touches.html">Handling Touches</a></li><li><a style="margin-left:0;" class="active" href="docs/animations.html">Animations</a></li><li><a style="margin-left:0;" class="" href="docs/accessibility.html">Accessibility</a></li><li><a style="margin-left:0;" class="" href="docs/timers.html">Timers</a></li><li><a style="margin-left:0;" class="" href="docs/direct-manipulation.html">Direct Manipulation</a></li><li><a style="margin-left:0;" class="" href="docs/debugging.html">Debugging</a></li><li><a style="margin-left:0;" class="" href="docs/testing.html">Testing</a></li><li><a style="margin-left:0;" class="" href="docs/running-on-device.html">Running On Device</a></li><li><a style="margin-left:0;" class="" href="docs/javascript-environment.html">JavaScript Environment</a></li><li><a style="margin-left:0;" class="" href="docs/navigation.html">Navigation</a></li><li><a style="margin-left:0;" class="" href="docs/performance.html">Performance</a></li><li><a style="margin-left:0;" class="" href="docs/understanding-cli.html">Understanding the CLI</a></li><li><a style="margin-left:0;" class="" href="docs/upgrading.html">Upgrading</a></li><li><a style="margin-left:0;" class="" href="docs/platform-specific-code.html">Platform Specific Code</a></li><li><a style="margin-left:0;" class="" href="docs/gesture-responder-system.html">Gesture Responder System</a></li></ul></div><div class="nav-docs-section"><h3>Guides (iOS)</h3><ul><li><a style="margin-left:0;" class="" href="docs/native-modules-ios.html">Native Modules</a></li><li><a style="margin-left:0;" class="" href="docs/native-components-ios.html">Native UI Components</a></li><li><a style="margin-left:0;" class="" href="docs/linking-libraries-ios.html">Linking Libraries</a></li><li><a style="margin-left:0;" class="" href="docs/running-on-simulator-ios.html">Running On Simulator</a></li><li><a style="margin-left:0;" class="" href="docs/communication-ios.html">Communication between native and React Native</a></li></ul></div><div class="nav-docs-section"><h3>Guides (Android)</h3><ul><li><a style="margin-left:0;" class="" href="docs/native-modules-android.html">Native Modules</a></li><li><a style="margin-left:0;" class="" href="docs/native-components-android.html">Native UI Components</a></li><li><a style="margin-left:0;" class="" href="docs/headless-js-android.html">Headless JS</a></li><li><a style="margin-left:0;" class="" href="docs/signed-apk-android.html">Generating Signed APK</a></li><li><a style="margin-left:0;" class="" href="docs/android-ui-performance.html">Profiling Android UI Performance</a></li><li><a style="margin-left:0;" class="" href="docs/android-building-from-source.html">Building React Native from source</a></li></ul></div><div class="nav-docs-section"><h3>components</h3><ul><li><a style="margin-left:0;" class="" href="docs/activityindicator.html">ActivityIndicator</a></li><li><a style="margin-left:0;" class="" href="docs/button.html">Button</a></li><li><a style="margin-left:0;" class="" href="docs/datepickerios.html">DatePickerIOS</a></li><li><a style="margin-left:0;" class="" href="docs/drawerlayoutandroid.html">DrawerLayoutAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/image.html">Image</a></li><li><a style="margin-left:0;" class="" href="docs/keyboardavoidingview.html">KeyboardAvoidingView</a></li><li><a style="margin-left:0;" class="" href="docs/listview.html">ListView</a></li><li><a style="margin-left:0;" class="" href="docs/mapview.html">MapView</a></li><li><a style="margin-left:0;" class="" href="docs/modal.html">Modal</a></li><li><a style="margin-left:0;" class="" href="docs/navigator.html">Navigator</a></li><li><a style="margin-left:0;" class="" href="docs/navigatorios.html">NavigatorIOS</a></li><li><a style="margin-left:0;" class="" href="docs/picker.html">Picker</a></li><li><a style="margin-left:0;" class="" href="docs/pickerios.html">PickerIOS</a></li><li><a style="margin-left:0;" class="" href="docs/progressbarandroid.html">ProgressBarAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/progressviewios.html">ProgressViewIOS</a></li><li><a style="margin-left:0;" class="" href="docs/refreshcontrol.html">RefreshControl</a></li><li><a style="margin-left:0;" class="" href="docs/scrollview.html">ScrollView</a></li><li><a style="margin-left:0;" class="" href="docs/segmentedcontrolios.html">SegmentedControlIOS</a></li><li><a style="margin-left:0;" class="" href="docs/slider.html">Slider</a></li><li><a style="margin-left:0;" class="" href="docs/snapshotviewios.html">SnapshotViewIOS</a></li><li><a style="margin-left:0;" class="" href="docs/statusbar.html">StatusBar</a></li><li><a style="margin-left:0;" class="" href="docs/switch.html">Switch</a></li><li><a style="margin-left:0;" class="" href="docs/tabbarios.html">TabBarIOS</a></li><li><a style="margin-left:0;" class="" href="docs/tabbarios-item.html">TabBarIOS.Item</a></li><li><a style="margin-left:0;" class="" href="docs/text.html">Text</a></li><li><a style="margin-left:0;" class="" href="docs/textinput.html">TextInput</a></li><li><a style="margin-left:0;" class="" href="docs/toolbarandroid.html">ToolbarAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/touchablehighlight.html">TouchableHighlight</a></li><li><a style="margin-left:0;" class="" href="docs/touchablenativefeedback.html">TouchableNativeFeedback</a></li><li><a style="margin-left:0;" class="" href="docs/touchableopacity.html">TouchableOpacity</a></li><li><a style="margin-left:0;" class="" href="docs/touchablewithoutfeedback.html">TouchableWithoutFeedback</a></li><li><a style="margin-left:0;" class="" href="docs/view.html">View</a></li><li><a style="margin-left:0;" class="" href="docs/viewpagerandroid.html">ViewPagerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/webview.html">WebView</a></li></ul></div><div class="nav-docs-section"><h3>apis</h3><ul><li><a style="margin-left:0;" class="" href="docs/actionsheetios.html">ActionSheetIOS</a></li><li><a style="margin-left:0;" class="" href="docs/adsupportios.html">AdSupportIOS</a></li><li><a style="margin-left:0;" class="" href="docs/alert.html">Alert</a></li><li><a style="margin-left:0;" class="" href="docs/alertios.html">AlertIOS</a></li><li><a style="margin-left:0;" class="" href="docs/animated.html">Animated</a></li><li><a style="margin-left:0;" class="" href="docs/appregistry.html">AppRegistry</a></li><li><a style="margin-left:0;" class="" href="docs/appstate.html">AppState</a></li><li><a style="margin-left:0;" class="" href="docs/asyncstorage.html">AsyncStorage</a></li><li><a style="margin-left:0;" class="" href="docs/backandroid.html">BackAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/cameraroll.html">CameraRoll</a></li><li><a style="margin-left:0;" class="" href="docs/clipboard.html">Clipboard</a></li><li><a style="margin-left:0;" class="" href="docs/datepickerandroid.html">DatePickerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/dimensions.html">Dimensions</a></li><li><a style="margin-left:0;" class="" href="docs/easing.html">Easing</a></li><li><a style="margin-left:0;" class="" href="docs/geolocation.html">Geolocation</a></li><li><a style="margin-left:0;" class="" href="docs/imageeditor.html">ImageEditor</a></li><li><a style="margin-left:0;" class="" href="docs/imagepickerios.html">ImagePickerIOS</a></li><li><a style="margin-left:0;" class="" href="docs/imagestore.html">ImageStore</a></li><li><a style="margin-left:0;" class="" href="docs/interactionmanager.html">InteractionManager</a></li><li><a style="margin-left:0;" class="" href="docs/keyboard.html">Keyboard</a></li><li><a style="margin-left:0;" class="" href="docs/layoutanimation.html">LayoutAnimation</a></li><li><a style="margin-left:0;" class="" href="docs/linking.html">Linking</a></li><li><a style="margin-left:0;" class="" href="docs/nativemethodsmixin.html">NativeMethodsMixin</a></li><li><a style="margin-left:0;" class="" href="docs/netinfo.html">NetInfo</a></li><li><a style="margin-left:0;" class="" href="docs/panresponder.html">PanResponder</a></li><li><a style="margin-left:0;" class="" href="docs/permissionsandroid.html">PermissionsAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/pixelratio.html">PixelRatio</a></li><li><a style="margin-left:0;" class="" href="docs/pushnotificationios.html">PushNotificationIOS</a></li><li><a style="margin-left:0;" class="" href="docs/settings.html">Settings</a></li><li><a style="margin-left:0;" class="" href="docs/share.html">Share</a></li><li><a style="margin-left:0;" class="" href="docs/statusbarios.html">StatusBarIOS</a></li><li><a style="margin-left:0;" class="" href="docs/stylesheet.html">StyleSheet</a></li><li><a style="margin-left:0;" class="" href="docs/systrace.html">Systrace</a></li><li><a style="margin-left:0;" class="" href="docs/timepickerandroid.html">TimePickerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/toastandroid.html">ToastAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/vibration.html">Vibration</a></li><li><a style="margin-left:0;" class="" href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:0;" class="" href="docs/layout-props.html">Layout Props</a></li><li><a style="margin-left:0;" class="" href="docs/shadow-props.html">Shadow Props</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="animations"></a>Animations <a class="hash-link" href="docs/animations.html#animations">#</a></h1><div><p>Fluid, meaningful animations are essential to the mobile user experience. Like
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everything in React Native, Animation APIs for React Native are currently under
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development, but have started to coalesce around two complementary systems:
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<code>LayoutAnimation</code> for animated global layout transactions, and <code>Animated</code> for
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more granular and interactive control of specific values.</p><h3><a class="anchor" name="animated"></a>Animated <a class="hash-link" href="docs/animations.html#animated">#</a></h3><p>The <code>Animated</code> library is designed to make it very easy to concisely express a
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wide variety of interesting animation and interaction patterns in a very
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performant way. <code>Animated</code> focuses on declarative relationships between inputs
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and outputs, with configurable transforms in between, and simple <code>start</code>/<code>stop</code>
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methods to control time-based animation execution. For example, a complete
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component with a simple spring bounce on mount looks like this:</p><div class="prism language-javascript">class <span class="token class-name">Playground</span> extends <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
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<span class="token function">constructor<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token function">super<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>state <span class="token operator">=</span> <span class="token punctuation">{</span>
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bounceValue<span class="token punctuation">:</span> <span class="token keyword">new</span> <span class="token class-name">Animated<span class="token punctuation">.</span>Value</span><span class="token punctuation">(</span><span class="token number">0</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>
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<span class="token punctuation">}</span>
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<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token punctuation">(</span>
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<Animated<span class="token punctuation">.</span>Image <span class="token comment" spellcheck="true"> // Base: Image, Text, View
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</span> source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>uri<span class="token punctuation">:</span> <span class="token string">'http://i.imgur.com/XMKOH81.jpg'</span><span class="token punctuation">}</span><span class="token punctuation">}</span>
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style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>
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flex<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
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transform<span class="token punctuation">:</span> <span class="token punctuation">[</span> <span class="token comment" spellcheck="true"> // `transform` is an ordered array
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</span> <span class="token punctuation">{</span>scale<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>bounceValue<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Map `bounceValue` to `scale`
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</span> <span class="token punctuation">]</span>
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<span class="token punctuation">}</span><span class="token punctuation">}</span>
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<span class="token operator">/</span><span class="token operator">></span>
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<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 function">componentDidMount<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>bounceValue<span class="token punctuation">.</span><span class="token function">setValue<span class="token punctuation">(</span></span><span class="token number">1.5</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true"> // Start large
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</span> Animated<span class="token punctuation">.</span><span class="token function">spring<span class="token punctuation">(</span></span> <span class="token comment" spellcheck="true"> // Base: spring, decay, timing
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</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>bounceValue<span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Animate `bounceValue`
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</span> <span class="token punctuation">{</span>
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toValue<span class="token punctuation">:</span> <span class="token number">0.8</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Animate to smaller size
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</span> friction<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // Bouncier spring
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</span> <span class="token punctuation">}</span>
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<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true"> // Start the animation
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</span> <span class="token punctuation">}</span>
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<span class="token punctuation">}</span></div><p><code>bounceValue</code> is initialized as part of <code>state</code> in the constructor, and mapped
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to the scale transform on the image. Behind the scenes, the numeric value is
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extracted and used to set scale. When the component mounts, the scale is set to
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1.5 and then a spring animation is started on <code>bounceValue</code> which will update
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all of its dependent mappings on each frame as the spring animates (in this
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case, just the scale). This is done in an optimized way that is faster than
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calling <code>setState</code> and re-rendering. Because the entire configuration is
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declarative, we will be able to implement further optimizations that serialize
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the configuration and runs the animation on a high-priority thread.</p><h4><a class="anchor" name="core-api"></a>Core API <a class="hash-link" href="docs/animations.html#core-api">#</a></h4><p>Most everything you need hangs directly off the <code>Animated</code> module. This
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includes two value types, <code>Value</code> for single values and <code>ValueXY</code> for vectors,
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three animation types, <code>spring</code>, <code>decay</code>, and <code>timing</code>, and three component
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types, <code>View</code>, <code>Text</code>, and <code>Image</code>. You can make any other component animated with
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<code>Animated.createAnimatedComponent</code>.</p><p>The three animation types can be used to create almost any animation curve you
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want because each can be customized:</p><ul><li><code>spring</code>: Simple single-spring physics model that matches <a href="https://facebook.github.io/origami/" target="_blank">Origami</a>.<ul><li><code>friction</code>: Controls "bounciness"/overshoot. Default 7.</li><li><code>tension</code>: Controls speed. Default 40.</li></ul></li><li><code>decay</code>: Starts with an initial velocity and gradually slows to a stop.<ul><li><code>velocity</code>: Initial velocity. Required.</li><li><code>deceleration</code>: Rate of decay. Default 0.997.</li></ul></li><li><code>timing</code>: Maps time range to easing value.<ul><li><code>duration</code>: Length of animation (milliseconds). Default 500.</li><li><code>easing</code>: Easing function to define curve. See <code>Easing</code> module for several
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predefined functions. iOS default is <code>Easing.inOut(Easing.ease)</code>.</li><li><code>delay</code>: Start the animation after delay (milliseconds). Default 0.</li></ul></li></ul><p>Animations are started by calling <code>start</code>. <code>start</code> takes a completion callback
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that will be called when the animation is done. If the animation is done
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because it finished running normally, the completion callback will be invoked
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with <code>{finished: true}</code>, but if the animation is done because <code>stop</code> was called
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on it before it could finish (e.g. because it was interrupted by a gesture or
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another animation), then it will receive <code>{finished: false}</code>.</p><h4><a class="anchor" name="composing-animations"></a>Composing Animations <a class="hash-link" href="docs/animations.html#composing-animations">#</a></h4><p>Animations can also be composed with <code>parallel</code>, <code>sequence</code>, <code>stagger</code>, and
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<code>delay</code>, each of which simply take an array of animations to execute and
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automatically calls start/stop as appropriate. For example:</p><div class="prism language-javascript">Animated<span class="token punctuation">.</span><span class="token function">sequence<span class="token punctuation">(</span></span><span class="token punctuation">[</span> <span class="token comment" spellcheck="true"> // spring to start and twirl after decay finishes
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</span> Animated<span class="token punctuation">.</span><span class="token function">decay<span class="token punctuation">(</span></span>position<span class="token punctuation">,</span> <span class="token punctuation">{</span> <span class="token comment" spellcheck="true"> // coast to a stop
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</span> velocity<span class="token punctuation">:</span> <span class="token punctuation">{</span>x<span class="token punctuation">:</span> gestureState<span class="token punctuation">.</span>vx<span class="token punctuation">,</span> y<span class="token punctuation">:</span> gestureState<span class="token punctuation">.</span>vy<span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token comment" spellcheck="true"> // velocity from gesture release
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</span> deceleration<span class="token punctuation">:</span> <span class="token number">0.997</span><span class="token punctuation">,</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
|
|
Animated<span class="token punctuation">.</span><span class="token function">parallel<span class="token punctuation">(</span></span><span class="token punctuation">[</span> <span class="token comment" spellcheck="true"> // after decay, in parallel:
|
|
</span> Animated<span class="token punctuation">.</span><span class="token function">spring<span class="token punctuation">(</span></span>position<span class="token punctuation">,</span> <span class="token punctuation">{</span>
|
|
toValue<span class="token punctuation">:</span> <span class="token punctuation">{</span>x<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span> y<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">}</span> <span class="token comment" spellcheck="true"> // return to start
|
|
</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
|
|
Animated<span class="token punctuation">.</span><span class="token function">timing<span class="token punctuation">(</span></span>twirl<span class="token punctuation">,</span> <span class="token punctuation">{</span> <span class="token comment" spellcheck="true"> // and twirl
|
|
</span> toValue<span class="token punctuation">:</span> <span class="token number">360</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 punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true"> // start the sequence group</span></div><p>By default, if one animation is stopped or interrupted, then all other
|
|
animations in the group are also stopped. Parallel has a <code>stopTogether</code> option
|
|
that can be set to <code>false</code> to disable this.</p><h4><a class="anchor" name="interpolation"></a>Interpolation <a class="hash-link" href="docs/animations.html#interpolation">#</a></h4><p>Another powerful part of the <code>Animated</code> API is the <code>interpolate</code> function. It
|
|
allows input ranges to map to different output ranges. For example, a simple
|
|
mapping to convert a 0-1 range to a 0-100 range would be</p><div class="prism language-javascript">value<span class="token punctuation">.</span><span class="token function">interpolate<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
|
inputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
|
|
outputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">100</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><code>interpolate</code> supports multiple range segments as well, which is handy for
|
|
defining dead zones and other handy tricks. For example, to get an negation
|
|
relationship at -300 that goes to 0 at -100, then back up to 1 at 0, and then
|
|
back down to zero at 100 followed by a dead-zone that remains at 0 for
|
|
everything beyond that, you could do:</p><div class="prism language-javascript">value<span class="token punctuation">.</span><span class="token function">interpolate<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
|
inputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token operator">-</span><span class="token number">300</span><span class="token punctuation">,</span> <span class="token operator">-</span><span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">101</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
|
|
outputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">300</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</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>Which would map like so:</p><table><thead><tr><th>Input</th><th>Output</th></tr></thead><thead><tr><td> -400</td><td>450</td></tr><tr><td> -300</td><td>300</td></tr><tr><td> -200</td><td>150</td></tr><tr><td> -100</td><td>0</td></tr><tr><td> -50</td><td>0.5</td></tr><tr><td> 0</td><td>1</td></tr><tr><td> 50</td><td>0.5</td></tr><tr><td> 100</td><td>0</td></tr><tr><td> 101</td><td>0</td></tr><tr><td> 200</td><td>0</td></tr></thead></table><p><code>interpolate</code> also supports mapping to strings, allowing you to animate colors as well as values with units. For example, if you wanted to animate a rotation you could do:</p><div class="prism language-javascript">value<span class="token punctuation">.</span><span class="token function">interpolate<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
|
inputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">360</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
|
|
outputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token string">'0deg'</span><span class="token punctuation">,</span> <span class="token string">'360deg'</span><span class="token punctuation">]</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span></div><p><code>interpolation</code> also supports arbitrary easing functions, many of which are
|
|
already implemented in the
|
|
<a href="https://github.com/facebook/react-native/blob/master/Libraries/Animation/Animated/Easing.js" target="_blank"><code>Easing</code></a>
|
|
class including quadratic, exponential, and bezier curves as well as functions
|
|
like step and bounce. <code>interpolation</code> also has configurable behavior for
|
|
extrapolating the <code>outputRange</code>. You can set the extrapolation by setting the <code>extrapolate</code>,
|
|
<code>extrapolateLeft</code> or <code>extrapolateRight</code> options. The default value is
|
|
<code>extend</code> but you can use <code>clamp</code> to prevent the output value from exceeding
|
|
<code>outputRange</code>.</p><h4><a class="anchor" name="tracking-dynamic-values"></a>Tracking Dynamic Values <a class="hash-link" href="docs/animations.html#tracking-dynamic-values">#</a></h4><p>Animated values can also track other values. Just set the <code>toValue</code> of an
|
|
animation to another animated value instead of a plain number, for example with
|
|
spring physics for an interaction like "Chat Heads", or via <code>timing</code> with
|
|
<code>duration: 0</code> for rigid/instant tracking. They can also be composed with
|
|
interpolations:</p><div class="prism language-javascript">Animated<span class="token punctuation">.</span><span class="token function">spring<span class="token punctuation">(</span></span>follower<span class="token punctuation">,</span> <span class="token punctuation">{</span>toValue<span class="token punctuation">:</span> leader<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
Animated<span class="token punctuation">.</span><span class="token function">timing<span class="token punctuation">(</span></span>opacity<span class="token punctuation">,</span> <span class="token punctuation">{</span>
|
|
toValue<span class="token punctuation">:</span> pan<span class="token punctuation">.</span>x<span class="token punctuation">.</span><span class="token function">interpolate<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
|
inputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">300</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
|
|
outputRange<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</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 punctuation">.</span><span class="token function">start<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span></div><p><code>ValueXY</code> is a handy way to deal with 2D interactions, such as panning/dragging.
|
|
It is a simple wrapper that basically just contains two <code>Animated.Value</code>
|
|
instances and some helper functions that call through to them, making <code>ValueXY</code>
|
|
a drop-in replacement for <code>Value</code> in many cases. For example, in the code
|
|
snippet above, <code>leader</code> and <code>follower</code> could both be of type <code>ValueXY</code> and the x
|
|
and y values will both track as you would expect.</p><h4><a class="anchor" name="input-events"></a>Input Events <a class="hash-link" href="docs/animations.html#input-events">#</a></h4><p><code>Animated.event</code> is the input side of the Animated API, allowing gestures and
|
|
other events to map directly to animated values. This is done with a structured
|
|
map syntax so that values can be extracted from complex event objects. The
|
|
first level is an array to allow mapping across multiple args, and that array
|
|
contains nested objects. In the example, you can see that <code>scrollX</code> maps to
|
|
<code>event.nativeEvent.contentOffset.x</code> (<code>event</code> is normally the first arg to the
|
|
handler), and <code>pan.x</code> and <code>pan.y</code> map to <code>gestureState.dx</code> and <code>gestureState.dy</code>,
|
|
respectively (<code>gestureState</code> is the second arg passed to the <code>PanResponder</code> handler).</p><div class="prism language-javascript">onScroll<span class="token operator">=</span><span class="token punctuation">{</span>Animated<span class="token punctuation">.</span><span class="token function">event<span class="token punctuation">(</span></span>
|
|
<span class="token comment" spellcheck="true"> // scrollX = e.nativeEvent.contentOffset.x
|
|
</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>nativeEvent<span class="token punctuation">:</span> <span class="token punctuation">{</span>contentOffset<span class="token punctuation">:</span> <span class="token punctuation">{</span>x<span class="token punctuation">:</span> scrollX<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>
|
|
onPanResponderMove<span class="token operator">=</span><span class="token punctuation">{</span>Animated<span class="token punctuation">.</span><span class="token function">event<span class="token punctuation">(</span></span><span class="token punctuation">[</span>
|
|
<span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true"> // ignore the native event
|
|
</span> <span class="token comment" spellcheck="true"> // extract dx and dy from gestureState
|
|
</span> <span class="token comment" spellcheck="true"> // like 'pan.x = gestureState.dx, pan.y = gestureState.dy'
|
|
</span> <span class="token punctuation">{</span>dx<span class="token punctuation">:</span> pan<span class="token punctuation">.</span>x<span class="token punctuation">,</span> dy<span class="token punctuation">:</span> pan<span class="token punctuation">.</span>y<span class="token punctuation">}</span>
|
|
<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div><h4><a class="anchor" name="responding-to-the-current-animation-value"></a>Responding to the Current Animation Value <a class="hash-link" href="docs/animations.html#responding-to-the-current-animation-value">#</a></h4><p>You may notice that there is no obvious way to read the current value while
|
|
animating - this is because the value may only be known in the native runtime
|
|
due to optimizations. If you need to run JavaScript in response to the current
|
|
value, there are two approaches:</p><ul><li><code>spring.stopAnimation(callback)</code> will stop the animation and invoke <code>callback</code>
|
|
with the final value - this is useful when making gesture transitions.</li><li><code>spring.addListener(callback)</code> will invoke <code>callback</code> asynchronously while the
|
|
animation is running, providing a recent value. This is useful for triggering
|
|
state changes, for example snapping a bobble to a new option as the user drags
|
|
it closer, because these larger state changes are less sensitive to a few frames
|
|
of lag compared to continuous gestures like panning which need to run at 60fps.</li></ul><h4><a class="anchor" name="future-work"></a>Future Work <a class="hash-link" href="docs/animations.html#future-work">#</a></h4><p>As previously mentioned, we're planning on optimizing Animated under the hood to
|
|
make it even more performant. We would also like to experiment with more
|
|
declarative and higher level gestures and triggers, such as horizontal vs.
|
|
vertical panning.</p><p>The above API gives a powerful tool for expressing all sorts of animations in a
|
|
concise, robust, and performant way. Check out more example code in
|
|
<a href="https://github.com/facebook/react-native/tree/master/Examples/UIExplorer/js/AnimatedGratuitousApp" target="_blank">UIExplorer/AnimationExample</a>. Of course there may still be times where <code>Animated</code>
|
|
doesn't support what you need, and the following sections cover other animation
|
|
systems.</p><h3><a class="anchor" name="layoutanimation"></a>LayoutAnimation <a class="hash-link" href="docs/animations.html#layoutanimation">#</a></h3><p><code>LayoutAnimation</code> allows you to globally configure <code>create</code> and <code>update</code>
|
|
animations that will be used for all views in the next render/layout cycle.
|
|
This is useful for doing flexbox layout updates without bothering to measure or
|
|
calculate specific properties in order to animate them directly, and is
|
|
especially useful when layout changes may affect ancestors, for example a "see
|
|
more" expansion that also increases the size of the parent and pushes down the
|
|
row below which would otherwise require explicit coordination between the
|
|
components in order to animate them all in sync.</p><p>Note that although <code>LayoutAnimation</code> is very powerful and can be quite useful,
|
|
it provides much less control than <code>Animated</code> and other animation libraries, so
|
|
you may need to use another approach if you can't get <code>LayoutAnimation</code> to do
|
|
what you want.</p><p>Note that in order to get this to work on <strong>Android</strong> you need to set the following flags via <code>UIManager</code>:</p><div class="prism language-javascript">UIManager<span class="token punctuation">.</span>setLayoutAnimationEnabledExperimental && UIManager<span class="token punctuation">.</span><span class="token function">setLayoutAnimationEnabledExperimental<span class="token punctuation">(</span></span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div><p><img src="img/LayoutAnimationExample.gif" alt=""></p><div class="prism language-javascript">class <span class="token class-name">App</span> extends <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
|
|
<span class="token function">constructor<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token function">super<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>state <span class="token operator">=</span> <span class="token punctuation">{</span> w<span class="token punctuation">:</span> <span class="token number">100</span><span class="token punctuation">,</span> h<span class="token punctuation">:</span> <span class="token number">100</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>_onPress <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_onPress<span class="token punctuation">.</span><span class="token function">bind<span class="token punctuation">(</span></span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token function">componentWillMount<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token comment" spellcheck="true"> // Animate creation
|
|
</span> LayoutAnimation<span class="token punctuation">.</span><span class="token function">spring<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">_onPress<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token comment" spellcheck="true"> // Animate the update
|
|
</span> LayoutAnimation<span class="token punctuation">.</span><span class="token function">spring<span class="token punctuation">(</span></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">setState<span class="token punctuation">(</span></span><span class="token punctuation">{</span>w<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>w <span class="token operator">+</span> <span class="token number">15</span><span class="token punctuation">,</span> h<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>h <span class="token operator">+</span> <span class="token number">15</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> <span class="token punctuation">(</span>
|
|
<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">></span>
|
|
<View style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">[</span>styles<span class="token punctuation">.</span>box<span class="token punctuation">,</span> <span class="token punctuation">{</span>width<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>w<span class="token punctuation">,</span> height<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>h<span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span>
|
|
<TouchableOpacity onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onPress<span class="token punctuation">}</span><span class="token operator">></span>
|
|
<View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>button<span class="token punctuation">}</span><span class="token operator">></span>
|
|
<Text style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>buttonText<span class="token punctuation">}</span><span class="token operator">></span>Press me<span class="token operator">!</span><<span class="token operator">/</span>Text<span class="token operator">></span>
|
|
<<span class="token operator">/</span>View<span class="token operator">></span>
|
|
<<span class="token operator">/</span>TouchableOpacity<span class="token operator">></span>
|
|
<<span class="token operator">/</span>View<span class="token operator">></span>
|
|
<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span></div><p><a href="https://rnplay.org/apps/uaQrGQ" target="_blank">Run this example</a></p><p>This example uses a preset value, you can customize the animations as
|
|
you need, see <a href="https://github.com/facebook/react-native/blob/master/Libraries/LayoutAnimation/LayoutAnimation.js" target="_blank">LayoutAnimation.js</a>
|
|
for more information.</p><h3><a class="anchor" name="requestanimationframe"></a>requestAnimationFrame <a class="hash-link" href="docs/animations.html#requestanimationframe">#</a></h3><p><code>requestAnimationFrame</code> is a polyfill from the browser that you might be
|
|
familiar with. It accepts a function as its only argument and calls that
|
|
function before the next repaint. It is an essential building block for
|
|
animations that underlies all of the JavaScript-based animation APIs. In
|
|
general, you shouldn't need to call this yourself - the animation APIs will
|
|
manage frame updates for you.</p><h3><a class="anchor" name="react-tween-state-not-recommended-use-animated-docs-animations-html-animated-instead"></a>react-tween-state (Not recommended - use <a href="docs/animations.html#animated" target="_blank">Animated</a> instead) <a class="hash-link" href="docs/animations.html#react-tween-state-not-recommended-use-animated-docs-animations-html-animated-instead">#</a></h3><p><a href="https://github.com/chenglou/react-tween-state" target="_blank">react-tween-state</a> is a
|
|
minimal library that does exactly what its name suggests: it <em>tweens</em> a
|
|
value in a component's state, starting at a <strong>from</strong> value and ending at
|
|
a <strong>to</strong> value. This means that it generates the values in between those
|
|
two values, and it sets the state on every <code>requestAnimationFrame</code> with
|
|
the intermediary value.</p><blockquote><p>Tweening definition from <a href="https://en.wikipedia.org/wiki/Inbetweening" target="_blank">Wikipedia</a></p><p>"... tweening is the process of generating intermediate frames between two
|
|
images to give the appearance that the first image evolves smoothly
|
|
into the second image. [Tweens] are the drawings between the key
|
|
frames which help to create the illusion of motion."</p></blockquote><p>The most obvious way to animate from one value to another is linearly:
|
|
you subtract the end value from the start value and divide the result by
|
|
the number of frames over which the animation occurs, and then add that
|
|
value to the current value on each frame until the end value is reached.
|
|
Linear easing often looks awkward and unnatural, so react-tween-state
|
|
provides a selection of popular <a href="http://easings.net/" target="_blank">easing functions</a>
|
|
that can be applied to make your animations more pleasing.</p><p>This library does not ship with React Native - in order to use it on
|
|
your project, you will need to install it with <code>npm i react-tween-state
|
|
--save</code> from your project directory.</p><div class="prism language-javascript">import tweenState from <span class="token string">'react-tween-state'</span><span class="token punctuation">;</span>
|
|
import reactMixin from <span class="token string">'react-mixin'</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true"> // https://github.com/brigand/react-mixin
|
|
</span>
|
|
class <span class="token class-name">App</span> extends <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
|
|
<span class="token function">constructor<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token function">super<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>state <span class="token operator">=</span> <span class="token punctuation">{</span> opacity<span class="token punctuation">:</span> <span class="token number">1</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
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|
<span class="token keyword">this</span><span class="token punctuation">.</span>_animateOpacity <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_animateOpacity<span class="token punctuation">.</span><span class="token function">bind<span class="token punctuation">(</span></span><span class="token keyword">this</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 function">_animateOpacity<span class="token punctuation">(</span></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">tweenState<span class="token punctuation">(</span></span><span class="token string">'opacity'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
|
|
easing<span class="token punctuation">:</span> tweenState<span class="token punctuation">.</span>easingTypes<span class="token punctuation">.</span>easeOutQuint<span class="token punctuation">,</span>
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|
duration<span class="token punctuation">:</span> <span class="token number">1000</span><span class="token punctuation">,</span>
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endValue<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>opacity <span class="token operator">===</span> <span class="token number">0.2</span> <span class="token operator">?</span> <span class="token number">1</span> <span class="token punctuation">:</span> <span class="token number">0.2</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>
|
|
|
|
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> <span class="token punctuation">(</span>
|
|
<View style<span class="token operator">=</span><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">'center'</span><span class="token punctuation">,</span> alignItems<span class="token punctuation">:</span> <span class="token string">'center'</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token operator">></span>
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|
<TouchableWithoutFeedback onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_animateOpacity<span class="token punctuation">}</span><span class="token operator">></span>
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|
<View ref<span class="token operator">=</span><span class="token punctuation">{</span>component <span class="token operator">=</span><span class="token operator">></span> <span class="token keyword">this</span><span class="token punctuation">.</span>_box <span class="token operator">=</span> component<span class="token punctuation">}</span>
|
|
style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>width<span class="token punctuation">:</span> <span class="token number">200</span><span class="token punctuation">,</span> height<span class="token punctuation">:</span> <span class="token number">200</span><span class="token punctuation">,</span> backgroundColor<span class="token punctuation">:</span> <span class="token string">'red'</span><span class="token punctuation">,</span>
|
|
opacity<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getTweeningValue<span class="token punctuation">(</span></span><span class="token string">'opacity'</span><span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span>
|
|
<<span class="token operator">/</span>TouchableWithoutFeedback<span class="token operator">></span>
|
|
<<span class="token operator">/</span>View<span class="token operator">></span>
|
|
<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
reactMixin<span class="token punctuation">.</span><span class="token function">onClass<span class="token punctuation">(</span></span>App<span class="token punctuation">,</span> tweenState<span class="token punctuation">.</span>Mixin<span class="token punctuation">)</span><span class="token punctuation">;</span></div><p><a href="https://rnplay.org/apps/4FUQ-A" target="_blank">Run this example</a></p><p><img src="img/TweenState.gif" alt=""></p><p>Here we animated the opacity, but as you might guess, we can animate any
|
|
numeric value. Read more about react-tween-state in its
|
|
<a href="https://github.com/chenglou/react-tween-state" target="_blank">README</a>.</p><h3><a class="anchor" name="rebound-not-recommended-use-animated-docs-animations-html-animated-instead"></a>Rebound (Not recommended - use <a href="docs/animations.html#animated" target="_blank">Animated</a> instead) <a class="hash-link" href="docs/animations.html#rebound-not-recommended-use-animated-docs-animations-html-animated-instead">#</a></h3><p><a href="https://github.com/facebook/rebound-js" target="_blank">Rebound.js</a> is a JavaScript port of
|
|
<a href="https://github.com/facebook/rebound" target="_blank">Rebound for Android</a>. It is
|
|
similar in concept to react-tween-state: you have an initial value and
|
|
set an end value, then Rebound generates intermediate values that you can
|
|
use for your animation. Rebound is modeled after spring physics; we
|
|
don't provide a duration when animating with springs, it is
|
|
calculated for us depending on the spring tension, friction, current
|
|
value and end value. Rebound <a href="https://github.com/facebook/react-native/search?utf8=%E2%9C%93&q=rebound" target="_blank">is used
|
|
internally</a>
|
|
by React Native on <code>Navigator</code> and <code>WarningBox</code>.</p><p><img src="img/ReboundImage.gif" alt=""></p><p>Notice that Rebound animations can be interrupted - if you release in
|
|
the middle of a press, it will animate back from the current state to
|
|
the original value.</p><div class="prism language-javascript">import rebound from <span class="token string">'rebound'</span><span class="token punctuation">;</span>
|
|
|
|
class <span class="token class-name">App</span> extends <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
|
|
<span class="token function">constructor<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token function">super<span class="token punctuation">(</span></span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>_onPressIn <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_onPressIn<span class="token punctuation">.</span><span class="token function">bind<span class="token punctuation">(</span></span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>_onPressOut <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_onPressOut<span class="token punctuation">.</span><span class="token function">bind<span class="token punctuation">(</span></span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token comment" spellcheck="true"> // First we initialize the spring and add a listener, which calls
|
|
</span> <span class="token comment" spellcheck="true"> // setState whenever it updates
|
|
</span> <span class="token function">componentWillMount<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token comment" spellcheck="true"> // Initialize the spring that will drive animations
|
|
</span> <span class="token keyword">this</span><span class="token punctuation">.</span>springSystem <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">rebound<span class="token punctuation">.</span>SpringSystem</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>_scrollSpring <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>springSystem<span class="token punctuation">.</span><span class="token function">createSpring<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">var</span> springConfig <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_scrollSpring<span class="token punctuation">.</span><span class="token function">getSpringConfig<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
springConfig<span class="token punctuation">.</span>tension <span class="token operator">=</span> <span class="token number">230</span><span class="token punctuation">;</span>
|
|
springConfig<span class="token punctuation">.</span>friction <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>_scrollSpring<span class="token punctuation">.</span><span class="token function">addListener<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
|
onSpringUpdate<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></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>scale<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_scrollSpring<span class="token punctuation">.</span><span class="token function">getCurrentValue<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><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment" spellcheck="true"> // Initialize the spring value at 1
|
|
</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_scrollSpring<span class="token punctuation">.</span><span class="token function">setCurrentValue<span class="token punctuation">(</span></span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token function">_onPressIn<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>_scrollSpring<span class="token punctuation">.</span><span class="token function">setEndValue<span class="token punctuation">(</span></span><span class="token number">0.5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token function">_onPressOut<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">this</span><span class="token punctuation">.</span>_scrollSpring<span class="token punctuation">.</span><span class="token function">setEndValue<span class="token punctuation">(</span></span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">var</span> imageStyle <span class="token operator">=</span> <span class="token punctuation">{</span>
|
|
width<span class="token punctuation">:</span> <span class="token number">250</span><span class="token punctuation">,</span>
|
|
height<span class="token punctuation">:</span> <span class="token number">200</span><span class="token punctuation">,</span>
|
|
transform<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>scaleX<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>scale<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>scaleY<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>scale<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 keyword">var</span> imageUri <span class="token operator">=</span> <span class="token string">"img/ReboundExample.png"</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token keyword">return</span> <span class="token punctuation">(</span>
|
|
<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">></span>
|
|
<TouchableWithoutFeedback onPressIn<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onPressIn<span class="token punctuation">}</span>
|
|
onPressOut<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onPressOut<span class="token punctuation">}</span><span class="token operator">></span>
|
|
<Image source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>uri<span class="token punctuation">:</span> imageUri<span class="token punctuation">}</span><span class="token punctuation">}</span> style<span class="token operator">=</span><span class="token punctuation">{</span>imageStyle<span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span>
|
|
<<span class="token operator">/</span>TouchableWithoutFeedback<span class="token operator">></span>
|
|
<<span class="token operator">/</span>View<span class="token operator">></span>
|
|
<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span></div><p><a href="https://rnplay.org/apps/NNI5eA" target="_blank">Run this example</a></p><p>You can also clamp the spring values so that they don't overshoot and
|
|
oscillate around the end value. In the above example, we would add
|
|
<code>this._scrollSpring.setOvershootClampingEnabled(true)</code> to change this.
|
|
See the below gif for an example of where in your interface you might
|
|
use this.</p><p><img src="img/Rebound.gif" alt=""> Screenshot from
|
|
<a href="https://github.com/brentvatne/react-native-scrollable-tab-view" target="_blank">react-native-scrollable-tab-view</a>.
|
|
You can run a similar example <a href="https://rnplay.org/apps/qHU_5w" target="_blank">here</a>.</p><h4><a class="anchor" name="a-sidenote-about-setnativeprops"></a>A sidenote about setNativeProps <a class="hash-link" href="docs/animations.html#a-sidenote-about-setnativeprops">#</a></h4><p>As mentioned <a href="docs/direct-manipulation.html" target="_blank">in the Direction Manipulation section</a>,
|
|
<code>setNativeProps</code> allows us to modify properties of native-backed
|
|
components (components that are actually backed by native views, unlike
|
|
composite components) directly, without having to <code>setState</code> and
|
|
re-render the component hierarchy.</p><p>We could use this in the Rebound example to update the scale - this
|
|
might be helpful if the component that we are updating is deeply nested
|
|
and hasn't been optimized with <code>shouldComponentUpdate</code>.</p><div class="prism language-javascript"><span class="token comment" spellcheck="true">// Back inside of the App component, replace the scrollSpring listener
|
|
</span><span class="token comment" spellcheck="true">// in componentWillMount with this:
|
|
</span><span class="token keyword">this</span><span class="token punctuation">.</span>_scrollSpring<span class="token punctuation">.</span><span class="token function">addListener<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
|
onSpringUpdate<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></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>_photo<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token punctuation">}</span>
|
|
<span class="token keyword">var</span> v <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_scrollSpring<span class="token punctuation">.</span><span class="token function">getCurrentValue<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token keyword">var</span> newProps <span class="token operator">=</span> <span class="token punctuation">{</span>style<span class="token punctuation">:</span> <span class="token punctuation">{</span>transform<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>scaleX<span class="token punctuation">:</span> v<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>scaleY<span class="token punctuation">:</span> v<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 keyword">this</span><span class="token punctuation">.</span>_photo<span class="token punctuation">.</span><span class="token function">setNativeProps<span class="token punctuation">(</span></span>newProps<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 comment" spellcheck="true">
|
|
// Lastly, we update the render function to no longer pass in the
|
|
</span><span class="token comment" spellcheck="true">// transform via style (avoid clashes when re-rendering) and to set the
|
|
</span><span class="token comment" spellcheck="true">// photo ref
|
|
</span><span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> <span class="token punctuation">(</span>
|
|
<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">></span>
|
|
<TouchableWithoutFeedback onPressIn<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onPressIn<span class="token punctuation">}</span> onPressOut<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onPressOut<span class="token punctuation">}</span><span class="token operator">></span>
|
|
<Image ref<span class="token operator">=</span><span class="token punctuation">{</span>component <span class="token operator">=</span><span class="token operator">></span> <span class="token keyword">this</span><span class="token punctuation">.</span>_photo <span class="token operator">=</span> component<span class="token punctuation">}</span>
|
|
source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>uri<span class="token punctuation">:</span> <span class="token string">"img/ReboundExample.png"</span><span class="token punctuation">}</span><span class="token punctuation">}</span>
|
|
style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>width<span class="token punctuation">:</span> <span class="token number">250</span><span class="token punctuation">,</span> height<span class="token punctuation">:</span> <span class="token number">200</span><span class="token punctuation">}</span><span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span>
|
|
<<span class="token operator">/</span>TouchableWithoutFeedback<span class="token operator">></span>
|
|
<<span class="token operator">/</span>View<span class="token operator">></span>
|
|
<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span></div><p><a href="https://rnplay.org/apps/fUqjAg" target="_blank">Run this example</a></p><p>It would not make sense to use <code>setNativeProps</code> with react-tween-state
|
|
because the updated tween values are set on the state automatically by
|
|
the library - Rebound on the other hand gives us an updated value for
|
|
each frame with the <code>onSpringUpdate</code> function.</p><p>If you find your animations with dropping frames (performing below 60
|
|
frames per second), look into using <code>setNativeProps</code> or
|
|
<code>shouldComponentUpdate</code> to optimize them. You may also want to defer any
|
|
computationally intensive work until after animations are complete,
|
|
using the
|
|
<a href="docs/interactionmanager.html" target="_blank">InteractionManager</a>. You
|
|
can monitor the frame rate by using the In-App Developer Menu "FPS
|
|
Monitor" tool.</p><h3><a class="anchor" name="navigator-scene-transitions"></a>Navigator Scene Transitions <a class="hash-link" href="docs/animations.html#navigator-scene-transitions">#</a></h3><p>As mentioned in the <a href="docs/navigator-comparison.html#content" target="_blank">Navigator
|
|
Comparison</a>,
|
|
<code>Navigator</code> is implemented in JavaScript and <code>NavigatorIOS</code> is a wrapper
|
|
around native functionality provided by <code>UINavigationController</code>, so
|
|
these scene transitions apply only to <code>Navigator</code>. In order to re-create
|
|
the various animations provided by <code>UINavigationController</code> and also
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make them customizable, React Native exposes a
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<a href="https://github.com/facebook/react-native/blob/master/Libraries/CustomComponents/Navigator/NavigatorSceneConfigs.js" target="_blank">NavigatorSceneConfigs</a> API which is then handed over to the <a href="https://github.com/facebook/react-native/blob/master/Libraries/CustomComponents/Navigator/Navigator.js" target="_blank">Navigator</a> <code>configureScene</code> prop.</p><div class="prism language-javascript">import <span class="token punctuation">{</span> Dimensions <span class="token punctuation">}</span> from <span class="token string">'react-native'</span><span class="token punctuation">;</span>
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<span class="token keyword">var</span> SCREEN_WIDTH <span class="token operator">=</span> Dimensions<span class="token punctuation">.</span><span class="token keyword">get</span><span class="token punctuation">(</span><span class="token string">'window'</span><span class="token punctuation">)</span><span class="token punctuation">.</span>width<span class="token punctuation">;</span>
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<span class="token keyword">var</span> BaseConfig <span class="token operator">=</span> Navigator<span class="token punctuation">.</span>SceneConfigs<span class="token punctuation">.</span>FloatFromRight<span class="token punctuation">;</span>
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<span class="token keyword">var</span> CustomLeftToRightGesture <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">assign<span class="token punctuation">(</span></span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> BaseConfig<span class="token punctuation">.</span>gestures<span class="token punctuation">.</span>pop<span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // Make it snap back really quickly after canceling pop
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</span> snapVelocity<span class="token punctuation">:</span> <span class="token number">8</span><span class="token punctuation">,</span>
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<span class="token comment" spellcheck="true"> // Make it so we can drag anywhere on the screen
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</span> edgeHitWidth<span class="token punctuation">:</span> SCREEN_WIDTH<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 keyword">var</span> CustomSceneConfig <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">assign<span class="token punctuation">(</span></span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> BaseConfig<span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // A very tightly wound spring will make this transition fast
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</span> springTension<span class="token punctuation">:</span> <span class="token number">100</span><span class="token punctuation">,</span>
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springFriction<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
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<span class="token comment" spellcheck="true"> // Use our custom gesture defined above
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</span> gestures<span class="token punctuation">:</span> <span class="token punctuation">{</span>
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pop<span class="token punctuation">:</span> CustomLeftToRightGesture<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><span class="token punctuation">;</span></div><p><a href="https://rnplay.org/apps/HPy6UA" target="_blank">Run this example</a></p><p>For further information about customizing scene transitions, <a href="https://github.com/facebook/react-native/blob/master/Libraries/CustomComponents/Navigator/NavigatorSceneConfigs.js" target="_blank">read the
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source</a>.</p></div><div class="docs-prevnext"><a class="docs-prev" href="docs/handling-touches.html#content">← Prev</a><a class="docs-next" href="docs/accessibility.html#content">Next →</a></div><p class="edit-page-block">You can <a target="_blank" href="https://github.com/facebook/react-native/blob/master/docs/Animations.md">edit the content above on GitHub</a> and send us a pull request!</p></div></section><footer class="nav-footer"><section class="sitemap"><a href="/react-native" class="nav-home"><img src="img/header_logo.png" alt="React Native" width="66" height="58"></a><div><h5><a href="docs/">Docs</a></h5><a href="docs/getting-started.html">Getting Started</a><a href="docs/tutorial.html">Tutorial</a><a href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a><a href="docs/more-resources.html">More Resources</a></div><div><h5><a href="/react-native/support.html">Community</a></h5><a href="/react-native/showcase.html">Showcase</a><a href="http://www.meetup.com/topics/react-native/" target="_blank">Upcoming Events</a><a href="https://www.facebook.com/groups/react.native.community" target="_blank">Facebook Group</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a></div><div><h5><a href="/react-native/support.html">Help</a></h5><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Stack Overflow</a><a href="https://discord.gg/0ZcbPKXt5bZjGY5n">Reactiflux Chat</a><a href="/react-native/versions.html" target="_blank">Latest Releases</a><a href="https://productpains.com/product/react-native/" target="_blank">Feature Requests</a></div><div><h5>More</h5><a href="/react-native/blog">Blog</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://facebook.github.io/react/" target="_blank">React</a></div></section><section class="newsletter"><div id="mc_embed_signup"><form action="//reactnative.us10.list-manage.com/subscribe/post?u=db0dd948e2b729ee62625b1a8&id=47cd41008f" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate><div id="mc_embed_signup_scroll"><label for="mce-EMAIL"><h5>Get the React Native Newsletter</h5></label><input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="email address" required><div style="position:absolute;left:-5000px;" aria-hidden="true"><input type="text" name="b_db0dd948e2b729ee62625b1a8_47cd41008f" tabindex="-1" value=""></div><div class="clear"><input type="submit" value="Sign up" name="subscribe" id="mc-embedded-subscribe" class="button"></div></div></form></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"></a><section class="copyright">Copyright © 2017 Facebook Inc.</section></footer></div><div id="fb-root"></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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