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<script src="https://snack.expo.io/embed.js" defer="defer"></script><title data-react-helmet="true">Timers · React Native</title><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="current"><meta data-react-helmet="true" name="docsearch:docusaurus_tag" content="docs-default-current"><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="Timers · React Native"><meta data-react-helmet="true" name="description" content="Timers are an important part of an application and React Native implements the browser timers."><meta data-react-helmet="true" property="og:description" content="Timers are an important part of an application and React Native implements the browser timers."><meta data-react-helmet="true" property="og:url" content="https://reactnative.dev/docs/next/timers"><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/next/timers"><link rel="stylesheet" href="/styles.f56da522.css">
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href="/docs/next/communication-ios">Communication between native and React Native</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/next/app-extensions">App Extensions</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/next/publishing-to-app-store">Publishing to Apple App Store</a></li></ul></li></ul></div></div></div><main class="docMainContainer_1zi2"><div class="container padding-vert--lg docItemWrapper_1hMI"><div class="row"><div class="col docItemCol_2AGf"><div class="alert alert--warning margin-bottom--md" role="alert"><div>This is unreleased documentation for React Native <strong>Next</strong> version.</div><div class="margin-top--md">For up-to-date documentation, see the <strong><a href="/docs/timers">latest version</a></strong> (0.64).</div></div><div class="docItemContainer_1tAC"><article><div><span class="badge badge--secondary">Version: Next</span></div><header><h1 class="docTitle_cWlf">Timers</h1></header><div class="markdown"><p>Timers are an important part of an application and React Native implements the <a href="https://developer.mozilla.org/en-US/Add-ons/Code_snippets/Timers" target="_blank" rel="noopener noreferrer">browser timers</a>.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_E4oP" id="timers"></a>Timers<a class="hash-link" href="#timers" title="Direct link to heading">#</a></h2><ul><li>setTimeout, clearTimeout</li><li>setInterval, clearInterval</li><li>setImmediate, clearImmediate</li><li>requestAnimationFrame, cancelAnimationFrame</li></ul><p><code>requestAnimationFrame(fn)</code> is not the same as <code>setTimeout(fn, 0)</code> - the former will fire after all the frames have flushed, whereas the latter will fire as quickly as possible (over 1000x per second on a iPhone 5S).</p><p><code>setImmediate</code> is executed at the end of the current JavaScript execution block, right before sending the batched response back to native. Note that if you call <code>setImmediate</code> within a <code>setImmediate</code> callback, it will be executed right away, it won&#x27;t yield back to native in between.</p><p>The <code>Promise</code> implementation uses <code>setImmediate</code> as its asynchronicity implementation.</p><blockquote><p>Note: when debugging on Android, if the times between the debugger and device have drifted; things such as animation, event behavior, etc., might not work properly or the results may not be accurate. Please correct this by running <code>adb shell &quot;date `date +%m%d%H%M%Y.%S%3N`&quot;</code> on your debugger machine. Root access is required for the use in real device.</p></blockquote><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_E4oP" id="interactionmanager"></a>InteractionManager<a class="hash-link" href="#interactionmanager" title="Direct link to heading">#</a></h2><p>One reason why well-built native apps feel so smooth is by avoiding expensive operations during interactions and animations. In React Native, we currently have a limitation that there is only a single JS execution thread, but you can use <code>InteractionManager</code> to make sure long-running work is scheduled to start after any interactions/animations have completed.</p><p>Applications can schedule tasks to run after interactions with the following:</p><div class="mdxCodeBlock_1daz"><div class="codeBlockContent_2es_"><div tabindex="0" class="prism-code language-jsx codeBlock_27aQ thin-scrollbar"><div class="codeBlockLines_2rCb" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain">InteractionManager</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">runAfterInteractions</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token operator" style="color:#fc929e">=&gt;</span><span class="token plain"> </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 comment" style="color:#93a1a1">// ...long-running synchronous task...</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token punctuation" style="color:#657b83">}</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div><button type="button" aria-label="Copy code to clipboard" class="copyButton_2bml">Copy</button></div></div><p>Compare this to other scheduling alternatives:</p><ul><li>requestAnimationFrame(): for code that animates a view over time.</li><li>setImmediate/setTimeout/setInterval(): run code later, note this may delay animations.</li><li>runAfterInteractions(): run code later, without delaying active animations.</li></ul><p>The touch handling system considers one or more active touches to be an &#x27;interaction&#x27; and will delay <code>runAfterInteractions()</code> callbacks until all touches have ended or been cancelled.</p><p>InteractionManager also allows applications to register animations by creating an interaction &#x27;handle&#x27; on animation start, and clearing it upon completion:</p><div class="mdxCodeBlock_1daz"><div class="codeBlockContent_2es_"><div tabindex="0" class="prism-code language-jsx codeBlock_27aQ thin-scrollbar"><div class="codeBlockLines_2rCb" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">var</span><span class="token plain"> handle </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> InteractionManager</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">createInteractionHandle</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</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 comment" style="color:#93a1a1">// run animation... (`runAfterInteractions` tasks are queued)</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token comment" style="color:#93a1a1">// later, on animation completion:</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain">InteractionManager</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">clearInteractionHandle</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">handle</span><span class="token punctuation" style="color:#657b83">)</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 comment" style="color:#93a1a1">// queued tasks run if all handles were cleared</span></div></div></div><button type="button" aria-label="Copy code to clipboard" class="copyButton_2bml">Copy</button></div></div></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/../docs/timers.md" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="1.2em" width="1.2em" preserveAspectRatio="xMidYMid meet" role="img" viewBox="0 0 40 40" class="iconEdit_2Hwv"><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 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col text--right"><em><small class="docMetadata-updated">Last updated on <time datetime="2020-09-09T09:28:56.000Z" class="docLastUpdatedAt_1gIo">9/9/2020</time></small></em></div></div></div><div class="margin-vert--lg"><nav class="pagination-nav" 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