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APIs</h4><ul><li class="navListItem"><a class="navItem" href="/docs/actionsheetios">ActionSheetIOS</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/docs/settings">Settings</a></li></ul></div></ul></div></div></section></div><script>
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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/settings.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" 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>
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<h2><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" 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>Example</h2>
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<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, { useState } <span class="hljs-keyword">from</span> <span class="hljs-string">"react"</span>;
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<span class="hljs-keyword">import</span> { Button, Settings, StyleSheet, Text, View } <span class="hljs-keyword">from</span> <span class="hljs-string">"react-native"</span>;
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<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> App = <span class="hljs-function"><span class="hljs-params">()</span> =></span> {
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<span class="hljs-keyword">const</span> [data, setData] = useState(Settings.get(<span class="hljs-string">"data"</span>));
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<span class="hljs-keyword">const</span> storeData = <span class="hljs-function"><span class="hljs-params">data</span> =></span> {
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Settings.set(data);
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setData(Settings.get(<span class="hljs-string">"data"</span>));
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};
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<span class="hljs-keyword">return</span> (
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<View style={styles.container}>
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<Text>Stored value:</Text>
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<Text style={styles.value}>{data}</Text>
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<Button
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onPress={() => storeData({ data: "React" })}
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title="Store 'React'"
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/>
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<Button
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onPress={() => storeData({ data: "Native" })}
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title="Store 'Native'"
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/>
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</View>
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);
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};
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const styles = StyleSheet.create({
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container: {
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flex: 1,
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justifyContent: "center",
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alignItems: "center"
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},
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value: {
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fontSize: 24,
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marginVertical: 12
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}
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});
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</code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
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data-snack-name="Settings Example"
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data-snack-description="Example usage"
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||
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%0Aexport%20default%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'React'%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'Native'%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"
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||
data-snack-platform="web"
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data-snack-supported-platforms=ios
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||
data-snack-preview="true"
|
||
style="
|
||
overflow: hidden;
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||
background: #fafafa;
|
||
border: 1px solid rgba(0,0,0,.16);
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border-radius: 4px;
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height: 514px;
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width: 100%;
|
||
"
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||
></div></div></div><hr>
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||
<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>
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<h2><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</h2>
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<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>
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||
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">clearWatch</span><span class="token punctuation">(</span>watchId<span class="token punctuation">:</span> number<span class="token punctuation">)</span>
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||
</code></pre>
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||
<p><code>watchId</code> is the number returned by <code>watchKeys()</code> when the subscription was originally configured.</p>
|
||
<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-jsx"><span class="token keyword">static</span> <span class="token keyword">get</span><span class="token punctuation">(</span>key<span class="token punctuation">:</span> string<span class="token punctuation">)</span><span class="token punctuation">:</span> mixed
|
||
</code></pre>
|
||
<p>Get the current value for a given <code>key</code> 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-jsx"><span class="token keyword">static</span> <span class="token keyword">set</span><span class="token punctuation">(</span>settings<span class="token punctuation">:</span> object<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-jsx"><span class="token keyword">static</span> <span class="token function">watchKeys</span><span class="token punctuation">(</span>keys<span class="token punctuation">:</span> string <span class="token operator">|</span> array<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>string</span><span class="token punctuation">></span></span><span class="token plain-text">, callback: function): number
|
||
</span></code></pre>
|
||
<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>
|
||
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/actionsheetios"><span class="arrow-prev">← </span><span class="function-name-prevnext">ActionSheetIOS</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#example">Example</a></li><li><a href="#methods">Methods</a><ul class="toc-headings"><li><a href="#clearwatch"><code>clearWatch()</code></a></li><li><a href="#get"><code>get()</code></a></li><li><a href="#set"><code>set()</code></a></li><li><a href="#watchkeys"><code>watchKeys()</code></a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/docs/getting-started.html">Getting Started</a><a href="/docs/tutorial.html">Tutorial</a><a href="/docs/components-and-apis.html">Components and APIs</a><a href="/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/help.html">The React Native Community</a><a href="/showcase.html">Who's using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/blog/">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="https://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
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