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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Settings · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="`Settings` serves as a wrapper for [`NSUserDefaults`](https://developer.apple.com/documentation/foundation/nsuserdefaults), a persistent key-value store available only on iOS."/><meta name="docsearch:version" content="next"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Settings · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/index.html"/><meta property="og:description" content="`Settings` serves as a wrapper for [`NSUserDefaults`](https://developer.apple.com/documentation/foundation/nsuserdefaults), a persistent key-value store available only on iOS."/><meta name="twitter:card" content="summary"/><link rel="shortcut icon" href="/react-native/img/favicon.png"/><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://facebook.github.io/react-native/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/react-native/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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href="/react-native/docs/next/toolbarandroid">ToolbarAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/touchablehighlight">TouchableHighlight</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/touchablenativefeedback">TouchableNativeFeedback</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/touchableopacity">TouchableOpacity</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/touchablewithoutfeedback">TouchableWithoutFeedback</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/view">View</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/viewpagerandroid">ViewPagerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/virtualizedlist">VirtualizedList</a></li><li class="navListItem"><a class="navItem" 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href="/react-native/docs/next/netinfo">NetInfo</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/panresponder">PanResponder</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/permissionsandroid">PermissionsAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/pixelratio">PixelRatio</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/pushnotificationios">PushNotificationIOS</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/react-native/docs/next/settings">Settings</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/shadow-props">Shadow Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/share">Share</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/statusbarios">StatusBarIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/stylesheet">StyleSheet</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/systrace">Systrace</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/text-style-props">Text Style Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/timepickerandroid">TimePickerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/toastandroid">ToastAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/transforms">Transforms</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/vibration">Vibration</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/vibrationios">VibrationIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/view-style-props">View Style Props</a></li></ul></div></div></section></div><script>
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</script></nav></div><div class="container mainContainer"><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/settings.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Settings</h1></header><article><div><span><p><code>Settings</code> serves as a wrapper for <a href="https://developer.apple.com/documentation/foundation/nsuserdefaults"><code>NSUserDefaults</code></a>, a persistent key-value store available only on iOS.</p>
<h3><a class="anchor" aria-hidden="true" id="methods"></a><a href="#methods" 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>Methods</h3>
<ul>
<li><a href="/react-native/docs/next/settings#get"><code>get</code></a></li>
<li><a href="/react-native/docs/next/settings#set"><code>set</code></a></li>
<li><a href="/react-native/docs/next/settings#watchkeys"><code>watchKeys</code></a></li>
<li><a href="/react-native/docs/next/settings#clearwatch"><code>clearWatch</code></a></li>
</ul>
<hr>
<h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" 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>Reference</h1>
<h2><a class="anchor" aria-hidden="true" id="methods-1"></a><a href="#methods-1" 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>Methods</h2>
<h3><a class="anchor" aria-hidden="true" id="get"></a><a href="#get" 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><code>get()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token keyword">get</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span>
</code></pre>
<p>Get the current value for a key in <code>NSUserDefaults</code>.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="set"></a><a href="#set" 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><code>set()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token keyword">set</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span>
</code></pre>
<p>Set one or more values in <code>NSUserDefaults</code>.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="watchkeys"></a><a href="#watchkeys" 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><code>watchKeys()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">watchKeys</span><span class="token punctuation">(</span>keys<span class="token punctuation">,</span> callback<span class="token punctuation">)</span>
</code></pre>
<p>Subscribe to be notified when the value for any of the keys specified by the <code>keys</code> array changes in <code>NSUserDefaults</code>. Returns a <code>watchId</code> number that may be used with <code>clearWatch()</code> to unsubscribe.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="clearwatch"></a><a href="#clearwatch" 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><code>clearWatch()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">clearWatch</span><span class="token punctuation">(</span>watchId<span class="token punctuation">)</span>
</code></pre>
<p><code>watchId</code> is the number returned by <code>watchKeys()</code> when the subscription was originally configured.</p>
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