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<script src="https://snack.expo.io/embed.js" defer="defer"></script><title data-react-helmet="true">Settings · 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="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="Settings · React Native"><meta data-react-helmet="true" name="description" content="Settings serves as a wrapper for NSUserDefaults, a persistent key-value store available only on iOS."><meta data-react-helmet="true" property="og:description" content="Settings serves as a wrapper for NSUserDefaults, a persistent key-value store available only on iOS."><meta data-react-helmet="true" property="og:url" content="https://reactnative.dev/docs/next/settings"><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/settings"><link rel="stylesheet" href="/styles.fccefeba.css">
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href="/docs/next/transforms">Transforms</a></li><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/vibration">Vibration</a></li><li class="menu__list-item"><a class="menu__link menu__link--sublist" href="#!" tabindex="0">Hooks</a><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/usecolorscheme">useColorScheme</a></li><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/usewindowdimensions">useWindowDimensions</a></li></ul></li><li class="menu__list-item"><a class="menu__link menu__link--sublist" href="#!" tabindex="0">Android APIs</a><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/backhandler">BackHandler</a></li><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/permissionsandroid">PermissionsAndroid</a></li><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/toastandroid">ToastAndroid</a></li></ul></li><li class="menu__list-item"><a class="menu__link menu__link--sublist menu__link--active" href="#!" tabindex="0">iOS APIs</a><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/actionsheetios">ActionSheetIOS</a></li><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/dynamiccolorios">DynamicColorIOS</a></li><li class="menu__list-item"><a aria-current="page" class="menu__link menu__link--active active" tabindex="0" href="/docs/next/settings">Settings</a></li></ul></li></ul></li></ul></div></div></div><main class="docMainContainer_1rYT"><div class="container padding-vert--lg docItemWrapper_1Hme"><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/settings">latest version</a></strong> (0.63).</div></div><div class="docItemContainer_1tAC"><article><div><span class="badge badge--secondary">Version: Next</span></div><header><h1 class="docTitle_cWlf">Settings</h1></header><div class="markdown"><p><code>Settings</code> serves as a wrapper for <a href="https://developer.apple.com/documentation/foundation/nsuserdefaults" target="_blank" rel="noopener noreferrer"><code>NSUserDefaults</code></a>, a persistent key-value store available only on iOS.</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 class="snack-player" data-snack-name="Settings Example" data-snack-description="Example usage" data-snack-code="import%20React%2C%20%7B%20useState%20%7D%20from%20%22react%22%3B%0Aimport%20%7B%20Button%2C%20Settings%2C%20StyleSheet%2C%20Text%2C%20View%20%7D%20from%20%22react-native%22%3B%0A%0Aconst%20App%20%3D%20()%20%3D%3E%20%7B%0A%20%20const%20%5Bdata%2C%20setData%5D%20%3D%20useState(Settings.get(%22data%22))%3B%0A%0A%20%20const%20storeData%20%3D%20data%20%3D%3E%20%7B%0A%20%20%20%20Settings.set(data)%3B%0A%20%20%20%20setData(Settings.get(%22data%22))%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%3EStored%20value%3A%3C%2FText%3E%0A%20%20%20%20%20%20%3CText%20style%3D%7Bstyles.value%7D%3E%7Bdata%7D%3C%2FText%3E%0A%20%20%20%20%20%20%3CButton%0A%20%20%20%20%20%20%20%20onPress%3D%7B()%20%3D%3E%20storeData(%7B%20data%3A%20%22React%22%20%7D)%7D%0A%20%20%20%20%20%20%20%20title%3D%22Store%20&#x27;React&#x27;%22%0A%20%20%20%20%20%20%2F%3E%0A%20%20%20%20%20%20%3CButton%0A%20%20%20%20%20%20%20%20onPress%3D%7B()%20%3D%3E%20storeData(%7B%20data%3A%20%22Native%22%20%7D)%7D%0A%20%20%20%20%20%20%20%20title%3D%22Store%20&#x27;Native&#x27;%22%0A%20%20%20%20%20%20%2F%3E%0A%20%20%20%20%3C%2FView%3E%0A%20%20)%3B%0A%7D%3B%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%2C%0A%20%20value%3A%20%7B%0A%20%20%20%20fontSize%3A%2024%2C%0A%20%20%20%20marginVertical%3A%2012%0A%20%20%7D%0A%7D)%3B%0A%0Aexport%20default%20App%3B" data-snack-platform="web" data-snack-supported-platforms="ios" data-snack-theme="light" data-snack-preview="true"></div><hr><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="clearwatch"></a><code>clearWatch()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#clearwatch" 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">clearWatch</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">watchId</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> number</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p><code>watchId</code> is the number returned by <code>watchKeys()</code> when the subscription was originally configured.</p><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">key</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> string</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> mixed</span></div></div></div></div></div><p>Get the current value for a given <code>key</code> in <code>NSUserDefaults</code>.</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">settings</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> object</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Set one or more values in <code>NSUserDefaults</code>.</p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="watchkeys"></a><code>watchKeys()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#watchkeys" 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">watchKeys</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">keys</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> string </span><span class="token operator" style="color:#fc929e">|</span><span class="token plain"> array</span><span class="token tag punctuation" style="color:#657b83">&lt;</span><span class="token tag" style="color:#fc929e">string</span><span class="token tag punctuation" style="color:#657b83">&gt;</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token function-variable function" style="color:#79b6f2">callback</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">function</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> number</span></div></div></div></div></div><p>Subscribe to be notified when the value for any of the keys specified by the <code>keys</code> parameter has been changed in <code>NSUserDefaults</code>. Returns a <code>watchId</code> number that may be used with <code>clearWatch()</code> to unsubscribe.</p><blockquote><p><strong>Note:</strong> <code>watchKeys()</code> by design ignores internal <code>set()</code> calls and fires callback only on changes preformed outside of React Native code.</p></blockquote></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/settings.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 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="2020-05-15T20:26:52.000Z" class="docLastUpdatedAt_1gIo">5/15/2020</time></small></em></div></div></div><div class="margin-vert--lg"><nav class="pagination-nav" aria-label="Blog list page navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/docs/next/dynamiccolorios"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« DynamicColorIOS</div></a></div><div class="pagination-nav__item pagination-nav__item--next"></div></nav></div></div></div><div class="col col--3"><div class="tableOfContents_3iuQ"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#example" class="table-of-contents__link">Example</a></li><li><a href="#methods" class="table-of-contents__link">Methods</a><ul><li><a href="#clearwatch" class="table-of-contents__link"><code>clearWatch()</code></a></li><li><a href="#get" class="table-of-contents__link"><code>get()</code></a></li><li><a href="#set" 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