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HTML
45 lines
31 KiB
HTML
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<script src="https://snack.expo.io/embed.js" defer="defer"></script><title data-react-helmet="true">Dimensions · React Native</title><meta data-react-helmet="true" property="twitter:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" name="twitter:image:alt" content="Image for React Native"><meta data-react-helmet="true" name="docsearch:language" content="en"><meta data-react-helmet="true" name="docsearch:version" content="0.63"><meta data-react-helmet="true" name="docsearch:docusaurus_tag" content="docs-default-0.63"><meta data-react-helmet="true" property="og:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" name="twitter:card" content="summary"><meta data-react-helmet="true" name="twitter:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" property="og:title" content="Dimensions · React Native"><meta data-react-helmet="true" name="description" content="useWindowDimensions is the preferred API for React components. Unlike Dimensions, it updates as the window's dimensions update. This works nicely with the React paradigm."><meta data-react-helmet="true" property="og:description" content="useWindowDimensions is the preferred API for React components. Unlike Dimensions, it updates as the window's dimensions update. This works nicely with the React paradigm."><meta data-react-helmet="true" property="og:url" content="https://reactnative.dev/docs/dimensions"><link data-react-helmet="true" rel="shortcut icon" href="/img/favicon.ico"><link data-react-helmet="true" rel="preconnect" href="https://BH4D9OD16A-dsn.algolia.net" crossorigin="anonymous"><link data-react-helmet="true" rel="canonical" href="https://reactnative.dev/docs/dimensions"><link rel="stylesheet" href="/styles.fccefeba.css">
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Unlike <code>Dimensions</code>, it updates as the window's dimensions update. This works nicely with the React paradigm.</p></blockquote><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">import</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"> Dimensions </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">from</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">'react-native'</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div><p>You can get the application window's width and height using the following code:</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">const</span><span class="token plain"> windowWidth </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> Dimensions</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">get</span><span class="token punctuation" style="color:#657b83">(</span><span class="token string" style="color:#8dc891">'window'</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">width</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">const</span><span class="token plain"> windowHeight </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> Dimensions</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">get</span><span class="token punctuation" style="color:#657b83">(</span><span class="token string" style="color:#8dc891">'window'</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">height</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div><blockquote><p>Although dimensions are available immediately, they may change (e.g due to device rotation, foldable devices etc) so any rendering logic or styles that depend on these constants should try to call this function on every render, rather than caching the value (for example, using inline styles rather than setting a value in a <code>StyleSheet</code>).</p></blockquote><p>If you are targeting foldable devices or devices which can change the screen size or app window size, you can use the event listener available in the Dimensions module as shown in the below example.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="example"></a>Example<a aria-hidden="true" tabindex="-1" class="hash-link" href="#example" title="Direct link to heading">#</a></h2><div><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_3gSF tabs__item--active" style="outline:none">Function Component</li><li role="tab" tabindex="0" aria-selected="false" class="tabs__item tabItem_3gSF" style="outline:none">Class Component</li></ul><div role="tabpanel" class="margin-vert--md"><div><div class="snack-player" data-snack-name="Dimensions" data-snack-description="Example usage" data-snack-code="import%20React%2C%20%7B%20useState%2C%20useEffect%20%7D%20from%20%22react%22%3B%0Aimport%20%7B%20View%2C%20StyleSheet%2C%20Text%2C%20Dimensions%20%7D%20from%20%22react-native%22%3B%0A%0Aconst%20window%20%3D%20Dimensions.get(%22window%22)%3B%0Aconst%20screen%20%3D%20Dimensions.get(%22screen%22)%3B%0A%0Aconst%20App%20%3D%20()%20%3D%3E%20%7B%0A%20%20const%20%5Bdimensions%2C%20setDimensions%5D%20%3D%20useState(%7B%20window%2C%20screen%20%7D)%3B%0A%0A%20%20const%20onChange%20%3D%20(%7B%20window%2C%20screen%20%7D)%20%3D%3E%20%7B%0A%20%20%20%20setDimensions(%7B%20window%2C%20screen%20%7D)%3B%0A%20%20%7D%3B%0A%0A%20%20useEffect(()%20%3D%3E%20%7B%0A%20%20%20%20Dimensions.addEventListener(%22change%22%2C%20onChange)%3B%0A%20%20%20%20return%20()%20%3D%3E%20%7B%0A%20%20%20%20%20%20Dimensions.removeEventListener(%22change%22%2C%20onChange)%3B%0A%20%20%20%20%7D%3B%0A%20%20%7D)%3B%0A%0A%20%20return%20(%0A%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%0A%20%20%20%20%20%20%3CText%3E%7B%60Window%20Dimensions%3A%20height%20-%20%24%7Bdimensions.window.height%7D%2C%20width%20-%20%24%7Bdimensions.window.width%7D%60%7D%3C%2FText%3E%0A%20%20%20%20%20%20%3CText%3E%7B%60Screen%20Dimensions%3A%20height%20-%20%24%7Bdimensions.screen.height%7D%2C%20width%20-%20%24%7Bdimensions.screen.width%7D%60%7D%3C%2FText%3E%0A%20%20%20%20%3C%2FView%3E%0A%20%20)%3B%0A%7D%0A%0Aconst%20styles%20%3D%20StyleSheet.create(%7B%0A%20%20container%3A%20%7B%0A%20%20%20%20flex%3A%201%2C%0A%20%20%20%20justifyContent%3A%20%22center%22%2C%0A%20%20%20%20alignItems%3A%20%22center%22%0A%20%20%7D%0A%7D)%3B%0A%0Aexport%20default%20App%3B" data-snack-platform="web" data-snack-supported-platforms="ios,android,web" data-snack-theme="light" data-snack-preview="true" data-snack-loading="lazy"></div></div></div></div><h1><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="reference"></a>Reference<a aria-hidden="true" tabindex="-1" class="hash-link" href="#reference" title="Direct link to heading">#</a></h1><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="methods"></a>Methods<a aria-hidden="true" tabindex="-1" class="hash-link" href="#methods" title="Direct link to heading">#</a></h2><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="addeventlistener"></a><code>addEventListener()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#addeventlistener" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">addEventListener</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">type</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> handler</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Add an event handler. Supported events:</p><ul><li><code>change</code>: Fires when a property within the <code>Dimensions</code> object changes. The argument to the event handler is an object with <code>window</code> and <code>screen</code> properties whose values are the same as the return values of <code>Dimensions.get('window')</code> and <code>Dimensions.get('screen')</code>, respectively.<ul><li><code>window</code> - Size of the visible Application window</li><li><code>screen</code> - Size of the device's screen</li></ul></li></ul><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="get"></a><code>get()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#get" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">get</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">dim</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Initial dimensions are set before <code>runApplication</code> is called so they should be available before any other require's are run, but may be updated later.</p><p>Example: <code>const {height, width} = Dimensions.get('window');</code></p><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr></thead><tbody><tr><td>dim</td><td>string</td><td>Yes</td><td>Name of dimension as defined when calling <code>set</code>. @returns {Object?} Value for the dimension.</td></tr></tbody></table><blockquote><p>For Android the <code>window</code> dimension will exclude the size used by the <code>status bar</code> (if not translucent) and <code>bottom navigation bar</code></p></blockquote><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="removeeventlistener"></a><code>removeEventListener()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#removeeventlistener" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">removeEventListener</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">type</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> handler</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Remove an event handler.</p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="set"></a><code>set()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#set" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">set</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">dims</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>This should only be called from native code by sending the didUpdateDimensions event.</p><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr></thead><tbody><tr><td>dims</td><td>object</td><td>Yes</td><td>string-keyed object of dimensions to set</td></tr></tbody></table></div></article><div class="docMetadata margin-vert--xl"><div class="row"><div class="col"><a href="https://github.com/facebook/react-native-website/blob/master/website/versioned_docs/version-0.63/dimensions.md" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="1.2em" width="1.2em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 40 40" style="margin-right:0.3em;vertical-align:sub"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 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