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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Height and Width · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="A component's height and width determine its size on the screen."/><meta name="docsearch:version" content="0.56"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Height and Width · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/index.html"/><meta property="og:description" content="A component's height and width determine its size on the screen."/><meta name="twitter:card" content="summary"/><link rel="shortcut icon" href="/react-native/img/favicon.png"/><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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href="/react-native/docs/touchablenativefeedback">TouchableNativeFeedback</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/touchableopacity">TouchableOpacity</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/touchablewithoutfeedback">TouchableWithoutFeedback</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/view">View</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/viewpagerandroid">ViewPagerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/virtualizedlist">VirtualizedList</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/webview">WebView</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">APIs</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/accessibilityinfo">AccessibilityInfo</a></li><li class="navListItem"><a class="navItem" 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document.addEventListener('DOMContentLoaded', function() {
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createToggler('#navToggler', '#docsNav', 'docsSliderActive');
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createToggler('#tocToggler', 'body', 'tocActive');
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function createToggler(togglerSelector, targetSelector, className) {
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toggler.onclick = function(event) {
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</script></nav></div><div class="container mainContainer"><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/height-and-width.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Height and Width</h1></header><article><div><span><p>A component's height and width determine its size on the screen.</p>
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<h2><a class="anchor" aria-hidden="true" id="fixed-dimensions"></a><a href="#fixed-dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fixed Dimensions</h2>
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<p>The simplest way to set the dimensions of a component is by adding a fixed <code>width</code> and <code>height</code> to style. All dimensions in React Native are unitless, and represent density-independent pixels.</p>
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<div class="web-player"><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> { AppRegistry, View } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
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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">FixedDimensionsBasics</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
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render() {
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<span class="hljs-keyword">return</span> (
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<View>
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<View style={{width: 50, height: 50, backgroundColor: 'powderblue'}} />
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<View style={{width: 100, height: 100, backgroundColor: 'skyblue'}} />
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<View style={{width: 150, height: 150, backgroundColor: 'steelblue'}} />
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</View>
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);
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}
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}
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// skip this line if using Create React Native App
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AppRegistry.registerComponent('AwesomeProject', () => FixedDimensionsBasics);
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</code></pre><iframe style="margin-top: 4" width="100%" height="420" data-src="//cdn.rawgit.com/dabbott/react-native-web-player/gh-v1.10.0/index.html#code=import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20AppRegistry%2C%20View%20%7D%20from%20'react-native'%3B%0A%0Aexport%20default%20class%20FixedDimensionsBasics%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%3CView%20style%3D%7B%7Bwidth%3A%2050%2C%20height%3A%2050%2C%20backgroundColor%3A%20'powderblue'%7D%7D%20%2F%3E%0A%20%20%20%20%20%20%20%20%3CView%20style%3D%7B%7Bwidth%3A%20100%2C%20height%3A%20100%2C%20backgroundColor%3A%20'skyblue'%7D%7D%20%2F%3E%0A%20%20%20%20%20%20%20%20%3CView%20style%3D%7B%7Bwidth%3A%20150%2C%20height%3A%20150%2C%20backgroundColor%3A%20'steelblue'%7D%7D%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%0A%2F%2F%20skip%20this%20line%20if%20using%20Create%20React%20Native%20App%0AAppRegistry.registerComponent('AwesomeProject'%2C%20()%20%3D%3E%20FixedDimensionsBasics)%3B%0A" frame-border="0"></iframe></div>
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<p>Setting dimensions this way is common for components that should always render at exactly the same size, regardless of screen dimensions.</p>
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<h2><a class="anchor" aria-hidden="true" id="flex-dimensions"></a><a href="#flex-dimensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Flex Dimensions</h2>
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<p>Use <code>flex</code> in a component's style to have the component expand and shrink dynamically based on available space. Normally you will use <code>flex: 1</code>, which tells a component to fill all available space, shared evenly amongst each other component with the same parent. The larger the <code>flex</code> given, the higher the ratio of space a component will take compared to its siblings.</p>
|
||
<blockquote>
|
||
<p>A component can only expand to fill available space if its parent has dimensions greater than 0. If a parent does not have either a fixed <code>width</code> and <code>height</code> or <code>flex</code>, the parent will have dimensions of 0 and the <code>flex</code> children will not be visible.</p>
|
||
</blockquote>
|
||
<div class="web-player"><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>;
|
||
<span class="hljs-keyword">import</span> { AppRegistry, View } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
|
||
|
||
<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">FlexDimensionsBasics</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
|
||
render() {
|
||
<span class="hljs-keyword">return</span> (
|
||
<span class="hljs-comment">// Try removing the `flex: 1` on the parent View.</span>
|
||
<span class="hljs-comment">// The parent will not have dimensions, so the children can't expand.</span>
|
||
<span class="hljs-comment">// What if you add `height: 300` instead of `flex: 1`?</span>
|
||
<View style={{<span class="hljs-attr">flex</span>: <span class="hljs-number">1</span>}}>
|
||
<View style={{flex: 1, backgroundColor: 'powderblue'}} />
|
||
<View style={{flex: 2, backgroundColor: 'skyblue'}} />
|
||
<View style={{flex: 3, backgroundColor: 'steelblue'}} />
|
||
</View>
|
||
);
|
||
}
|
||
}
|
||
|
||
// skip this line if using Create React Native App
|
||
AppRegistry.registerComponent('AwesomeProject', () => FlexDimensionsBasics);
|
||
</code></pre><iframe style="margin-top: 4" width="100%" height="420" data-src="//cdn.rawgit.com/dabbott/react-native-web-player/gh-v1.10.0/index.html#code=import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20AppRegistry%2C%20View%20%7D%20from%20'react-native'%3B%0A%0Aexport%20default%20class%20FlexDimensionsBasics%20extends%20Component%20%7B%0A%20%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%2F%2F%20Try%20removing%20the%20%60flex%3A%201%60%20on%20the%20parent%20View.%0A%20%20%20%20%20%20%2F%2F%20The%20parent%20will%20not%20have%20dimensions%2C%20so%20the%20children%20can't%20expand.%0A%20%20%20%20%20%20%2F%2F%20What%20if%20you%20add%20%60height%3A%20300%60%20instead%20of%20%60flex%3A%201%60%3F%0A%20%20%20%20%20%20%3CView%20style%3D%7B%7Bflex%3A%201%7D%7D%3E%0A%20%20%20%20%20%20%20%20%3CView%20style%3D%7B%7Bflex%3A%201%2C%20backgroundColor%3A%20'powderblue'%7D%7D%20%2F%3E%0A%20%20%20%20%20%20%20%20%3CView%20style%3D%7B%7Bflex%3A%202%2C%20backgroundColor%3A%20'skyblue'%7D%7D%20%2F%3E%0A%20%20%20%20%20%20%20%20%3CView%20style%3D%7B%7Bflex%3A%203%2C%20backgroundColor%3A%20'steelblue'%7D%7D%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%0A%2F%2F%20skip%20this%20line%20if%20using%20Create%20React%20Native%20App%0AAppRegistry.registerComponent('AwesomeProject'%2C%20()%20%3D%3E%20FlexDimensionsBasics)%3B%0A" frame-border="0"></iframe></div>
|
||
|
||
<p>After you can control a component's size, the next step is to <a href="/react-native/docs/flexbox">learn how to lay it out on the screen</a>.</p>
|
||
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/style">← Style</a><a class="docs-next button" href="/react-native/docs/flexbox">Layout with Flexbox →</a></div></div></div></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/react-native/" class="nav-home"><img src="/react-native/img/header_logo.png" alt="React Native" width="66" height="58"/></a><div><h5><a href="/react-native/docs/getting-started.html">Docs</a></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><a href="/react-native/help.html">Community</a></h5><a href="/react-native/showcase.html">Who's using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Stack Overflow</a><a href="https://discuss.reactjs.org" target="_blank">Discussion Forum</a><a href="https://discord.gg/0ZcbPKXt5bZjGY5n">Reactiflux Chat</a></div><div><h5>More</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 © 2018 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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