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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>State · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="There are two types of data that control a component: `props` and `state`. `props` are set by the parent and they are fixed throughout the lifetime of a component. For data that is going to change, we have to use `state`."/><meta name="docsearch:version" content="next"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="State · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/"/><meta property="og:description" content="There are two types of data that control a component: `props` and `state`. `props` are set by the parent and they are fixed throughout the lifetime of a component. For data that is going to change, we have to use `state`."/><meta name="twitter:card" content="summary"/><link rel="shortcut icon" href="/react-native/img/favicon.ico"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://facebook.github.io/react-native/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/react-native/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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class="navListItem"><a class="navItem" href="/react-native/docs/next/troubleshooting">Troubleshooting</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/platform-specific-code">Platform Specific Code</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/more-resources">More Resources</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Environment setup<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/integration-with-existing-apps">Integration with Existing Apps</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/building-for-apple-tv">Building For TV Devices</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/out-of-tree-platforms">Out-of-Tree Platforms</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Workflow<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/running-on-device">Running On Device</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/fast-refresh">Fast Refresh</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/debugging">Debugging</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/typescript">Using TypeScript with React Native</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/upgrading">Upgrading to new React Native versions</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Design<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/colors">Color Reference</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/images">Images</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/stylesheet">StyleSheet</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/flexbox">Layout with Flexbox</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/height-and-width">Height and Width</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Interaction<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/handling-touches">Handling Touches</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/navigation">Navigating Between Screens</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/animations">Animations</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/gesture-responder-system">Gesture Responder System</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Inclusion<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/accessibility">Accessibility</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Performance<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/performance">Performance</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/optimizing-flatlist-configuration">Optimizing Flatlist Configuration</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">JavaScript Runtime<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/javascript-environment">JavaScript Environment</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/timers">Timers</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/hermes">Using Hermes</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Connectivity<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/network">Networking</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Native Components and Modules<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/native-modules-setup">Native Modules Setup</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/direct-manipulation">Direct Manipulation</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Guides (iOS)<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/native-modules-ios">Native Modules</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/native-components-ios">Native UI Components</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/linking-libraries-ios">Linking Libraries</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/running-on-simulator-ios">Running On Simulator</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/communication-ios">Communication between native and React Native</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/app-extensions">App Extensions</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Guides (Android)<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/next/native-modules-android">Native Modules</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/native-components-android">Native UI Components</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/headless-js-android">Headless JS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/signed-apk-android">Publishing to Google Play Store</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/removing-default-permissions">Removing Default Permissions</a></li></ul></div></div></section></div><script>
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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/state.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">State</h1></header><article><div><span><p>There are two types of data that control a component: <code>props</code> and <code>state</code>. <code>props</code> are set by the parent and they are fixed throughout the lifetime of a component. For data that is going to change, we have to use <code>state</code>.</p>
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||
<p>In general, you should initialize <code>state</code> in the constructor, and then call <code>setState</code> when you want to change it.</p>
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<p>For example, let's say we want to make text that blinks all the time. The text itself gets set once when the blinking component gets created, so the text itself is a <code>prop</code>. The "whether the text is currently on or off" changes over time, so that should be kept in <code>state</code>.</p>
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||
<div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { Component } <span class="hljs-keyword">from</span> <span class="hljs-string">'react'</span>;
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<span class="hljs-keyword">import</span> { Text, View } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
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<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Blink</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
|
||
|
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componentDidMount(){
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<span class="hljs-comment">// Toggle the state every second</span>
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setInterval(<span class="hljs-function"><span class="hljs-params">()</span> =></span> (
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<span class="hljs-keyword">this</span>.setState(<span class="hljs-function"><span class="hljs-params">previousState</span> =></span> (
|
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{ <span class="hljs-attr">isShowingText</span>: !previousState.isShowingText }
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))
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), <span class="hljs-number">1000</span>);
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}
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||
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<span class="hljs-comment">//state object</span>
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state = { <span class="hljs-attr">isShowingText</span>: <span class="hljs-literal">true</span> };
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render() {
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<span class="hljs-keyword">if</span> (!<span class="hljs-keyword">this</span>.state.isShowingText) {
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<span class="hljs-keyword">return</span> <span class="hljs-literal">null</span>;
|
||
}
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||
|
||
<span class="hljs-keyword">return</span> (
|
||
<span class="xml"><span class="hljs-tag"><<span class="hljs-name">Text</span>></span>{this.props.text}<span class="hljs-tag"></<span class="hljs-name">Text</span>></span></span>
|
||
);
|
||
}
|
||
}
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||
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||
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">BlinkApp</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
|
||
render() {
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||
<span class="hljs-keyword">return</span> (
|
||
<View>
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||
<Blink text='I love to blink' />
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||
<Blink text='Yes blinking is so great' />
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||
<Blink text='Why did they ever take this out of HTML' />
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<Blink text='Look at me look at me look at me' />
|
||
</View>
|
||
);
|
||
}
|
||
}
|
||
</code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
|
||
data-snack-name="State"
|
||
data-snack-description="Example usage"
|
||
data-snack-code="import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20Text%2C%20View%20%7D%20from%20'react-native'%3B%0A%0Aclass%20Blink%20extends%20Component%20%7B%0A%0A%20%20componentDidMount()%7B%0A%20%20%20%20%2F%2F%20Toggle%20the%20state%20every%20second%0A%20%20%20%20setInterval(()%20%3D%3E%20(%0A%20%20%20%20%20%20this.setState(previousState%20%3D%3E%20(%0A%20%20%20%20%20%20%20%20%7B%20isShowingText%3A%20!previousState.isShowingText%20%7D%0A%20%20%20%20%20%20))%0A%20%20%20%20)%2C%201000)%3B%0A%20%20%7D%0A%0A%20%20%2F%2Fstate%20object%0A%20%20state%20%3D%20%7B%20isShowingText%3A%20true%20%7D%3B%0A%0A%20%20render()%20%7B%0A%20%20%20%20if%20(!this.state.isShowingText)%20%7B%0A%20%20%20%20%20%20return%20null%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CText%3E%7Bthis.props.text%7D%3C%2FText%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A%0Aexport%20default%20class%20BlinkApp%20extends%20Component%20%7B%0A%20%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%3E%0A%20%20%20%20%20%20%20%20%3CBlink%20text%3D'I%20love%20to%20blink'%20%2F%3E%0A%20%20%20%20%20%20%20%20%3CBlink%20text%3D'Yes%20blinking%20is%20so%20great'%20%2F%3E%0A%20%20%20%20%20%20%20%20%3CBlink%20text%3D'Why%20did%20they%20ever%20take%20this%20out%20of%20HTML'%20%2F%3E%0A%20%20%20%20%20%20%20%20%3CBlink%20text%3D'Look%20at%20me%20look%20at%20me%20look%20at%20me'%20%2F%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A"
|
||
data-snack-platform="web"
|
||
data-snack-supported-platforms=ios,android,web
|
||
data-snack-preview="true"
|
||
style="
|
||
overflow: hidden;
|
||
background: #fafafa;
|
||
border: 1px solid rgba(0,0,0,.16);
|
||
border-radius: 4px;
|
||
height: 514px;
|
||
width: 100%;
|
||
"
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||
></div></div></div><p>In a real application, you probably won't be setting state with a timer. You might set state when you have new data from the server, or from user input. You can also use a state container like <a href="https://redux.js.org/">Redux</a> or <a href="https://mobx.js.org/">Mobx</a> to control your data flow. In that case you would use Redux or Mobx to modify your state rather than calling <code>setState</code> directly.</p>
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<p>When setState is called, BlinkApp will re-render its Component. By calling setState within the Timer, the component will re-render every time the Timer ticks.</p>
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<p>State works the same way as it does in React, so for more details on handling state, you can look at the <a href="https://reactjs.org/docs/react-component.html#setstate">React.Component API</a>. At this point, you may have noticed that most of our examples use the default text color. To customize the text color, you will have to <a href="/react-native/docs/next/style">learn about Style</a>.</p>
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</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/props"><span class="arrow-prev">← </span><span>Props</span></a><a class="docs-next button" href="/react-native/docs/next/style"><span>Style</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who's using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/react-native/blog/">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><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'));
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