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<!DOCTYPE html><htmllang="en"><head><metacharSet="utf-8"/><metahttp-equiv="X-UA-Compatible" content="IE=edge"/><title>Animated · React Native</title><metaname="viewport" content="width=device-width"/><metaname="generator" content="Docusaurus"/><metaname="description" content="The `Animated` library is designed to make animations fluid, powerful, and easy to build and maintain. `Animated` focuses on declarative relationships between inputs and outputs, with configurable transforms in between, and simple `start`/`stop` methods to control time-based animation execution."/><metaname="docsearch:version" content="0.50"/><metaname="docsearch:language" content="en"/><metaproperty="og:title" content="Animated · React Native"/><metaproperty="og:type" content="website"/><metaproperty="og:url" content="https://facebook.github.io/react-native/"/><metaproperty="og:description" content="The `Animated` library is designed to make animations fluid, powerful, and easy to build and maintain. `Animated` focuses on declarative relationships between inputs and outputs, with configurable transforms in between, and simple `start`/`stop` methods to control time-based animation execution."/><metaname="twitter:card" content="summary"/><linkrel="shortcut icon" href="/react-native/img/favicon.ico"/><linkrel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><linkrel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><linkrel="alternate" type="application/atom+xml" href="https://facebook.github.io/react-native/blog/atom.xml" title="React Native Blog ATOM Feed"/><linkrel="alternate" type="application/rss+xml" href="https://facebook.github.io/react-native/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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<!DOCTYPE html><htmllang="en"><head><metacharSet="utf-8"/><metahttp-equiv="X-UA-Compatible" content="IE=edge"/><title>Animated · React Native</title><metaname="viewport" content="width=device-width"/><metaname="generator" content="Docusaurus"/><metaname="description" content="The `Animated` library is designed to make animations fluid, powerful, and painless to build and maintain. `Animated` focuses on declarative relationships between inputs and outputs, with configurable transforms in between, and `start`/`stop` methods to control time-based animation execution."/><metaname="docsearch:version" content="0.50"/><metaname="docsearch:language" content="en"/><metaproperty="og:title" content="Animated · React Native"/><metaproperty="og:type" content="website"/><metaproperty="og:url" content="https://facebook.github.io/react-native/"/><metaproperty="og:description" content="The `Animated` library is designed to make animations fluid, powerful, and painless to build and maintain. `Animated` focuses on declarative relationships between inputs and outputs, with configurable transforms in between, and `start`/`stop` methods to control time-based animation execution."/><metaname="twitter:card" content="summary"/><linkrel="shortcut icon" href="/react-native/img/favicon.ico"/><linkrel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><linkrel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><linkrel="alternate" type="application/atom+xml" href="https://facebook.github.io/react-native/blog/atom.xml" title="React Native Blog ATOM Feed"/><linkrel="alternate" type="application/rss+xml" href="https://facebook.github.io/react-native/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
</script></nav></div><divclass="container mainContainer"><divclass="wrapper"><divclass="post"><headerclass="postHeader"><aclass="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/animated.md" target="_blank" rel="noreferrer noopener">Edit</a><h1class="postHeaderTitle">Animated</h1></header><article><div><span><p>The <code>Animated</code> library is designed to make animations fluid, powerful, and easy to build and maintain. <code>Animated</code> focuses on declarative relationships between inputs and outputs, with configurable transforms in between, and simple<code>start</code>/<code>stop</code> methods to control time-based animation execution.</p>
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</script></nav></div><divclass="container mainContainer"><divclass="wrapper"><divclass="post"><headerclass="postHeader"><aclass="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/animated.md" target="_blank" rel="noreferrer noopener">Edit</a><h1class="postHeaderTitle">Animated</h1></header><article><div><span><p>The <code>Animated</code> library is designed to make animations fluid, powerful, and painless to build and maintain. <code>Animated</code> focuses on declarative relationships between inputs and outputs, with configurable transforms in between, and <code>start</code>/<code>stop</code> methods to control time-based animation execution.</p>
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<p>The simplest workflow for creating an animation is to create an <code>Animated.Value</code>, hook it up to one or more style attributes of an animated component, and then drive updates via animations using <code>Animated.timing()</code>:</p>
<p><code>Animated</code> provides three types of animation types. Each animation type provides a particular animation curve that controls how your values animate from their initial value to the final value:</p>
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<ul>
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<li><ahref="/react-native/docs/0.50/animated#decay"><code>Animated.decay()</code></a> starts with an initial velocity and gradually slows to a stop.</li>
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<li><ahref="/react-native/docs/0.50/animated#spring"><code>Animated.spring()</code></a> provides a simple spring physics model.</li>
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<li><ahref="/react-native/docs/0.50/animated#spring"><code>Animated.spring()</code></a> provides a basic spring physics model.</li>
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<li><ahref="/react-native/docs/0.50/animated#timing"><code>Animated.timing()</code></a> animates a value over time using <ahref="/react-native/docs/0.50/easing">easing functions</a>.</li>
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</ul>
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<p>In most cases, you will be using <code>timing()</code>. By default, it uses a symmetric easeInOut curve that conveys the gradual acceleration of an object to full speed and concludes by gradually decelerating to a stop.</p>
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<p>By using the native driver, we send everything about the animation to native before starting the animation, allowing native code to perform the animation on the UI thread without having to go through the bridge on every frame. Once the animation has started, the JS thread can be blocked without affecting the animation.</p>
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<p>You can use the native driver by specifying <code>useNativeDriver: true</code> in your animation configuration. See the <ahref="/react-native/docs/0.50/animations#using-the-native-driver">Animations</a> guide to learn more.</p>
<p>Only animatable components can be animated. These special components do the magic of binding the animated values to the properties, and do targeted native updates to avoid the cost of the react render and reconciliation process on every frame. They also handle cleanup on unmount so they are safe by default.</p>
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<p>Only animatable components can be animated. These unique components do the magic of binding the animated values to the properties, and do targeted native updates to avoid the cost of the react render and reconciliation process on every frame. They also handle cleanup on unmount so they are safe by default.</p>
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<ul>
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<li><ahref="/react-native/docs/0.50/animated#createanimatedcomponent"><code>createAnimatedComponent()</code></a> can be used to make a component animatable.</li>
<li><ahref="/react-native/docs/0.50/animated#sequence"><code>Animated.sequence()</code></a> starts the animations in order, waiting for each to complete before starting the next.</li>
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<li><ahref="/react-native/docs/0.50/animated#stagger"><code>Animated.stagger()</code></a> starts animations in order and in parallel, but with successive delays.</li>
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<p>Animations can also be chained together simply by setting the <code>toValue</code> of one animation to be another <code>Animated.Value</code>. See <ahref="/react-native/docs/0.50/animations#tracking-dynamic-values">Tracking dynamic values</a> in the Animations guide.</p>
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<p>Animations can also be chained together by setting the <code>toValue</code> of one animation to be another <code>Animated.Value</code>. See <ahref="/react-native/docs/0.50/animations#tracking-dynamic-values">Tracking dynamic values</a> in the Animations guide.</p>
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<p>By default, if one animation is stopped or interrupted, then all other animations in the group are also stopped.</p>
<p>Animates a value according to an analytical spring model based on <ahref="https://en.wikipedia.org/wiki/Harmonic_oscillator#Damped_harmonic_oscillator">damped harmonic oscillation</a>. Tracks velocity state to create fluid motions as the <code>toValue</code> updates, and can be chained together.</p>
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<p>Config is an object that may have the following options.</p>
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<p>Note that you can only define one of bounciness/speed, tension/friction, or stiffness/damping/mass, but not more than one:</p>
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<p>The friction/tension or bounciness/speed options match the spring model in <ahref="https://github.com/facebook/pop">Facebook Pop</a>, <ahref="http://facebook.github.io/rebound/">Rebound</a>, and <ahref="http://origami.design/">Origami</a>.</p>
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<p>The friction/tension or bounciness/speed options match the spring model in <ahref="https://github.com/facebook/pop"><code>Facebook Pop</code></a>, <ahref="http://facebook.github.io/rebound/">Rebound</a>, and <ahref="http://origami.design/">Origami</a>.</p>
<p>Specifying stiffness/damping/mass as parameters makes <code>Animated.spring</code> use an analytical spring model based on the motion equations of a <ahref="https://en.wikipedia.org/wiki/Harmonic_oscillator#Damped_harmonic_oscillator">damped harmonic oscillator</a>. This behavior is slightly more precise and faithful to the physics behind spring dynamics, and closely mimics the implementation in iOS's CASpringAnimation primitive.</p>
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<p>Specifying stiffness/damping/mass as parameters makes <code>Animated.spring</code> use an analytical spring model based on the motion equations of a <ahref="https://en.wikipedia.org/wiki/Harmonic_oscillator#Damped_harmonic_oscillator">damped harmonic oscillator</a>. This behavior is slightly more precise and faithful to the physics behind spring dynamics, and closely mimics the implementation in iOS's CASpringAnimation.</p>
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<li><code>stiffness</code>: The spring stiffness coefficient. Default 100.</li>
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<li><code>damping</code>: Defines how the spring’s motion should be damped due to the forces of friction. Default 10.</li>
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