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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="0.13"/><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://reactnative.dev/"/><meta property="og:description" content="A component's height and width determine its size on the screen."/><meta property="og:image" content="https://reactnative.dev/img/logo-og.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://reactnative.dev/img/logo-og.png"/><link rel="shortcut icon" href="/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://reactnative.dev/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://reactnative.dev/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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href="/docs/0.13/datepickerios">DatePickerIOS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.13/drawerlayoutandroid">DrawerLayoutAndroid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.13/image">Image</a></li><li class="navListItem"><a class="navItem" href="/docs/0.13/modal">Modal</a></li><li class="navListItem"><a class="navItem" href="/docs/0.13/navigator">Navigator</a></li><li class="navListItem"><a class="navItem" href="/docs/0.13/navigatorios">NavigatorIOS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.13/progressbarandroid">ProgressBarAndroid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.13/progressviewios">ProgressViewIOS</a></li><li class="navListItem"><a class="navItem" href="/docs/0.13/scrollview">ScrollView</a></li><li class="navListItem"><a class="navItem" href="/docs/0.13/segmentedcontrolios">SegmentedControlIOS</a></li><li class="navListItem"><a class="navItem" 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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/height-and-width.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" 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="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> { 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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<span class="xml"><span class="hljs-tag"><<span class="hljs-name">View</span>></span>
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<span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{width:</span> <span class="hljs-attr">50</span>, <span class="hljs-attr">height:</span> <span class="hljs-attr">50</span>, <span class="hljs-attr">backgroundColor:</span> '<span class="hljs-attr">powderblue</span>'}} /></span>
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<span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{width:</span> <span class="hljs-attr">100</span>, <span class="hljs-attr">height:</span> <span class="hljs-attr">100</span>, <span class="hljs-attr">backgroundColor:</span> '<span class="hljs-attr">skyblue</span>'}} /></span>
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<span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{width:</span> <span class="hljs-attr">150</span>, <span class="hljs-attr">height:</span> <span class="hljs-attr">150</span>, <span class="hljs-attr">backgroundColor:</span> '<span class="hljs-attr">steelblue</span>'}} /></span>
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<span class="hljs-tag"></<span class="hljs-name">View</span>></span></span>
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);
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}
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}
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</code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
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data-snack-name="Height and Width"
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data-snack-description="Example usage"
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data-snack-code="import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%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"
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data-snack-platform="web"
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data-snack-supported-platforms=ios,android,web
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data-snack-preview="true"
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style="
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overflow: hidden;
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background: #fafafa;
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border: 1px solid rgba(0,0,0,.16);
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border-radius: 4px;
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height: 514px;
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width: 100%;
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"
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></div></div></div><p>Setting dimensions this way is common for components that should always render at exactly the same size, regardless of screen dimensions.</p>
|
||
<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>
|
||
<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 other components 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="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>;
|
||
<span class="hljs-keyword">import</span> { 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>
|
||
<span class="xml"><span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{flex:</span> <span class="hljs-attr">1</span>}}></span>
|
||
<span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{flex:</span> <span class="hljs-attr">1</span>, <span class="hljs-attr">backgroundColor:</span> '<span class="hljs-attr">powderblue</span>'}} /></span>
|
||
<span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{flex:</span> <span class="hljs-attr">2</span>, <span class="hljs-attr">backgroundColor:</span> '<span class="hljs-attr">skyblue</span>'}} /></span>
|
||
<span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{flex:</span> <span class="hljs-attr">3</span>, <span class="hljs-attr">backgroundColor:</span> '<span class="hljs-attr">steelblue</span>'}} /></span>
|
||
<span class="hljs-tag"></<span class="hljs-name">View</span>></span></span>
|
||
);
|
||
}
|
||
}
|
||
</code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
|
||
data-snack-name="Flex Dimensions"
|
||
data-snack-description="Example usage"
|
||
data-snack-code="import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%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"
|
||
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%;
|
||
"
|
||
></div></div></div><p>After you can control a component's size, the next step is to <a href="/docs/0.13/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="/docs/0.13/style"><span class="arrow-prev">← </span><span>Style</span></a><a class="docs-next button" href="/docs/0.13/flexbox"><span>Layout with Flexbox</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#fixed-dimensions">Fixed Dimensions</a></li><li><a href="#flex-dimensions">Flex Dimensions</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/docs/getting-started">Getting Started</a><a href="/docs/tutorial">Tutorial</a><a href="/docs/components-and-apis">Components and APIs</a><a href="/docs/more-resources">More Resources</a></div><div><h5>Community</h5><a href="/help">The React Native Community</a><a href="/showcase">Who's using React Native?</a><a href="https://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="/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="https://reactjs.org" target="_blank">React</a></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 © 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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