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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>
<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>
<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>
<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">FixedDimensionsBasics</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
render() {
<span class="hljs-keyword">return</span> (
&lt;View&gt;
&lt;View style={{width: 50, height: 50, backgroundColor: 'powderblue'}} /&gt;
&lt;View style={{width: 100, height: 100, backgroundColor: 'skyblue'}} /&gt;
&lt;View style={{width: 150, height: 150, backgroundColor: 'steelblue'}} /&gt;
&lt;/View&gt;
);
}
}
</code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
data-snack-name="Height and Width"
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%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"
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>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>
&lt;View style={{flex: 1}}&gt;
&lt;View style={{flex: 1, backgroundColor: 'powderblue'}} /&gt;
&lt;View style={{flex: 2, backgroundColor: 'skyblue'}} /&gt;
&lt;View style={{flex: 3, backgroundColor: 'steelblue'}} /&gt;
&lt;/View&gt;
);
}
}
</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="/react-native/docs/flexbox">learn how to lay it out on the screen</a>.</p>
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