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<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><title>AsyncStorage – React Native | A framework for building native apps using React</title><meta name="viewport" content="width=device-width"><meta property="og:title" content="AsyncStorage – React Native | A framework for building native apps using React"><meta property="og:type" content="website"><meta property="og:url" content="http://facebook.github.io/react-native/index.html"><meta property="og:image" content="http://facebook.github.io/react-native/img/opengraph.png?2"><meta property="og:description" content="A framework for building native apps using React"><base href="/react-native/"><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"><link rel="shortcut icon" href="img/favicon.png?2"><link rel="stylesheet" href="css/react-native.css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><div class="container"><div class="nav-main"><div class="wrap"><a class="nav-home" href=""><img src="img/header_logo.png">React Native</a><a class="nav-version" href="/react-native/versions.html">0.26</a><div class="nav-site-wrapper"><ul class="nav-site nav-site-internal"><li><a href="docs/getting-started.html" class="active">Docs</a></li><li><a href="support.html" class="">Support</a></li><li><a href="showcase.html" class="">Showcase</a></li><li><a href="blog/" class="">Blog</a></li></ul><div class="algolia-search-wrapper"><input id="algolia-doc-search" type="text" placeholder="Search docs..."></div><ul class="nav-site nav-site-external"><li><a href="https://github.com/facebook/react-native" class="">GitHub</a></li><li><a href="http://facebook.github.io/react" class="">React</a></li></ul></div></div></div><section class="content wrap documentationContent"><div class="nav-docs"><div 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href="docs/flexbox.html#content">Flexbox</a></li><li><a style="margin-left:0;" class="" href="docs/shadowproptypesios.html#content">ShadowPropTypesIOS</a></li><li><a style="margin-left:0;" class="" href="docs/geolocation.html#content">Geolocation</a></li><li><a style="margin-left:0;" class="" href="docs/network.html#content">Network</a></li><li><a style="margin-left:0;" class="" href="docs/timers.html#content">Timers</a></li><li><a style="margin-left:0;" class="" href="docs/colors.html#content">Colors</a></li></ul></div></div><div class="inner-content"><a id="content"></a><table width="100%"><tbody><tr><td><h1><a class="anchor" name="asyncstorage"></a>AsyncStorage <a class="hash-link" href="docs/asyncstorage.html#asyncstorage">#</a></h1></td><td style="text-align:right;"><a target="_blank" href="https://github.com/facebook/react-native/blob/master/Libraries/Storage/AsyncStorage.js">Edit on GitHub</a></td></tr></tbody></table><div><div><p>AsyncStorage is a simple, asynchronous, persistent, key-value storage
system that is global to the app. It should be used instead of LocalStorage.</p><p>It is recommended that you use an abstraction on top of AsyncStorage instead
of AsyncStorage directly for anything more than light usage since it
operates globally.</p><p>On iOS, AsyncStorage is backed by native code that stores small values in a serialized
dictionary and larger values in separate files. On Android, AsyncStorage will use either
RocksDB or SQLite based on what is available. This JS code is a simple facade that
provides a clear JS API, real Error objects, and simple non-multi functions. Each
method returns a <code>Promise</code> object.</p></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="docs/asyncstorage.html#methods">#</a></h3><div class="props"><div class="prop"><h4 class="propTitle"><a class="anchor" name="getitem"></a><span class="propType">static </span>getItem<span class="propType">(key, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#getitem">#</a></h4><div><p>Fetches <code>key</code> and passes the result to <code>callback</code>, along with an <code>Error</code> if
there is any. Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="setitem"></a><span class="propType">static </span>setItem<span class="propType">(key, value, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#setitem">#</a></h4><div><p>Sets <code>value</code> for <code>key</code> and calls <code>callback</code> on completion, along with an
<code>Error</code> if there is any. Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="removeitem"></a><span class="propType">static </span>removeItem<span class="propType">(key, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#removeitem">#</a></h4><div><p>Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="mergeitem"></a><span class="propType">static </span>mergeItem<span class="propType">(key, value, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#mergeitem">#</a></h4><div><p>Merges existing value with input value, assuming they are stringified json.
Returns a <code>Promise</code> object. Not supported by all native implementations.</p><p>Example:</p><div class="prism language-javascript"><span class="token keyword">let</span> UID123_object <span class="token operator">=</span> <span class="token punctuation">{</span>
name<span class="token punctuation">:</span> <span class="token string">&#x27;Chris&#x27;</span><span class="token punctuation">,</span>
age<span class="token punctuation">:</span> <span class="token number">30</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>hair<span class="token punctuation">:</span> <span class="token string">&#x27;brown&#x27;</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">&#x27;brown&#x27;</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">
// need only define what will be added or updated
</span><span class="token keyword">let</span> UID123_delta <span class="token operator">=</span> <span class="token punctuation">{</span>
age<span class="token punctuation">:</span> <span class="token number">31</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>eyes<span class="token punctuation">:</span> <span class="token string">&#x27;blue&#x27;</span><span class="token punctuation">,</span> shoe_size<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">setItem<span class="token punctuation">(</span></span>store_key<span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID123_object<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">mergeItem<span class="token punctuation">(</span></span><span class="token string">&#x27;UID123&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID123_delta<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">getItem<span class="token punctuation">(</span></span><span class="token string">&#x27;UID123&#x27;</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">,</span> result<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log<span class="token punctuation">(</span></span>result<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true"> // =&gt; {&#x27;name&#x27;:&#x27;Chris&#x27;,&#x27;age&#x27;:31,&#x27;traits&#x27;:{&#x27;shoe_size&#x27;:10,&#x27;hair&#x27;:&#x27;brown&#x27;,&#x27;eyes&#x27;:&#x27;blue&#x27;}}
</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="clear"></a><span class="propType">static </span>clear<span class="propType">(callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#clear">#</a></h4><div><p>Erases <em>all</em> AsyncStorage for all clients, libraries, etc. You probably
don&#x27;t want to call this - use removeItem or multiRemove to clear only your
own keys instead. Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="getallkeys"></a><span class="propType">static </span>getAllKeys<span class="propType">(callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#getallkeys">#</a></h4><div><p>Gets <em>all</em> keys known to the app, for all callers, libraries, etc. Returns a <code>Promise</code> object.</p><p>Example: see multiGet for example</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="flushgetrequests"></a><span class="propType">static </span>flushGetRequests<span class="propType">()</span> <a class="hash-link" href="docs/asyncstorage.html#flushgetrequests">#</a></h4><div><p>Flushes any pending requests using a single multiget</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiget"></a><span class="propType">static </span>multiGet<span class="propType">(keys, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#multiget">#</a></h4><div><p>multiGet invokes callback with an array of key-value pair arrays that
matches the input format of multiSet. Returns a <code>Promise</code> object.</p><p> multiGet([&#x27;k1&#x27;, &#x27;k2&#x27;], cb) -&gt; cb([[&#x27;k1&#x27;, &#x27;val1&#x27;], [&#x27;k2&#x27;, &#x27;val2&#x27;]])</p><p>Example:</p><div class="prism language-javascript">AsyncStorage<span class="token punctuation">.</span><span class="token function">getAllKeys<span class="token punctuation">(</span></span><span class="token punctuation">(</span>err<span class="token punctuation">,</span> keys<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiGet<span class="token punctuation">(</span></span>keys<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">,</span> stores<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
stores<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>result<span class="token punctuation">,</span> i<span class="token punctuation">,</span> store<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true"> // get at each store&#x27;s key/value so you can work with it
</span> <span class="token keyword">let</span> key <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> value <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiset"></a><span class="propType">static </span>multiSet<span class="propType">(keyValuePairs, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#multiset">#</a></h4><div><p>multiSet and multiMerge take arrays of key-value array pairs that match
the output of multiGet, e.g. Returns a <code>Promise</code> object.</p><p> multiSet([[&#x27;k1&#x27;, &#x27;val1&#x27;], [&#x27;k2&#x27;, &#x27;val2&#x27;]], cb);</p><p>Example: see multiMerge for an example</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiremove"></a><span class="propType">static </span>multiRemove<span class="propType">(keys, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#multiremove">#</a></h4><div><p>Delete all the keys in the <code>keys</code> array. Returns a <code>Promise</code> object.</p><p>Example:</p><div class="prism language-javascript"><span class="token keyword">let</span> keys <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">&#x27;k1&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;k2&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiRemove<span class="token punctuation">(</span></span>keys<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true"> // keys k1 &amp; k2 removed, if they existed
</span> <span class="token comment" spellcheck="true"> // do most stuff after removal (if you want)
</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multimerge"></a><span class="propType">static </span>multiMerge<span class="propType">(keyValuePairs, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#multimerge">#</a></h4><div><p>Merges existing values with input values, assuming they are stringified
json. Returns a <code>Promise</code> object.</p><p>Not supported by all native implementations.</p><p>Example:</p><div class="prism language-javascript"><span class="token comment" spellcheck="true">// first user, initial values
</span><span class="token keyword">let</span> UID234_object <span class="token operator">=</span> <span class="token punctuation">{</span>
name<span class="token punctuation">:</span> <span class="token string">&#x27;Chris&#x27;</span><span class="token punctuation">,</span>
age<span class="token punctuation">:</span> <span class="token number">30</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>hair<span class="token punctuation">:</span> <span class="token string">&#x27;brown&#x27;</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">&#x27;brown&#x27;</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">
// first user, delta values
</span><span class="token keyword">let</span> UID234_delta <span class="token operator">=</span> <span class="token punctuation">{</span>
age<span class="token punctuation">:</span> <span class="token number">31</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>eyes<span class="token punctuation">:</span> <span class="token string">&#x27;blue&#x27;</span><span class="token punctuation">,</span> shoe_size<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">
// second user, initial values
</span><span class="token keyword">let</span> UID345_object <span class="token operator">=</span> <span class="token punctuation">{</span>
name<span class="token punctuation">:</span> <span class="token string">&#x27;Marge&#x27;</span><span class="token punctuation">,</span>
age<span class="token punctuation">:</span> <span class="token number">25</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>hair<span class="token punctuation">:</span> <span class="token string">&#x27;blonde&#x27;</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">&#x27;blue&#x27;</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">
// second user, delta values
</span><span class="token keyword">let</span> UID345_delta <span class="token operator">=</span> <span class="token punctuation">{</span>
age<span class="token punctuation">:</span> <span class="token number">26</span><span class="token punctuation">,</span>
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>eyes<span class="token punctuation">:</span> <span class="token string">&#x27;green&#x27;</span><span class="token punctuation">,</span> shoe_size<span class="token punctuation">:</span> <span class="token number">6</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> multi_set_pairs <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token string">&#x27;UID234&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID234_object<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token string">&#x27;UID345&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID345_object<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
<span class="token keyword">let</span> multi_merge_pairs <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token string">&#x27;UID234&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID234_delta<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token string">&#x27;UID345&#x27;</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID345_delta<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiSet<span class="token punctuation">(</span></span>multi_set_pairs<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiMerge<span class="token punctuation">(</span></span>multi_merge_pairs<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiGet<span class="token punctuation">(</span></span><span class="token punctuation">[</span><span class="token string">&#x27;UID234&#x27;</span><span class="token punctuation">,</span><span class="token string">&#x27;UID345&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">,</span> stores<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
stores<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span> <span class="token punctuation">(</span>result<span class="token punctuation">,</span> i<span class="token punctuation">,</span> store<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
<span class="token keyword">let</span> key <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> val <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log<span class="token punctuation">(</span></span>key<span class="token punctuation">,</span> val<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true"> // =&gt; UID234 {&quot;name&quot;:&quot;Chris&quot;,&quot;age&quot;:31,&quot;traits&quot;:{&quot;shoe_size&quot;:10,&quot;hair&quot;:&quot;brown&quot;,&quot;eyes&quot;:&quot;blue&quot;}}
</span> <span class="token comment" spellcheck="true"> // =&gt; UID345 {&quot;name&quot;:&quot;Marge&quot;,&quot;age&quot;:26,&quot;traits&quot;:{&quot;shoe_size&quot;:6,&quot;hair&quot;:&quot;blonde&quot;,&quot;eyes&quot;:&quot;green&quot;}}
</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div></div></span><span><h3><a class="anchor" name="properties"></a>Properties <a class="hash-link" href="docs/asyncstorage.html#properties">#</a></h3><div class="props"></div></span></div><div><div><table width="100%"><tbody><tr><td><h3><a class="anchor" name="examples"></a>Examples <a class="hash-link" href="docs/asyncstorage.html#examples">#</a></h3></td><td style="text-align:right;"><a target="_blank" href="https://github.com/facebook/react-native/blob/master/Examples/UIExplorer/AsyncStorageExample.js">Edit on GitHub</a></td></tr></tbody></table><div class="prism language-javascript"><span class="token string">&#x27;use strict&#x27;</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> React <span class="token operator">=</span> <span class="token function">require<span class="token punctuation">(</span></span><span class="token string">&#x27;react&#x27;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> ReactNative <span class="token operator">=</span> <span class="token function">require<span class="token punctuation">(</span></span><span class="token string">&#x27;react-native&#x27;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> <span class="token punctuation">{</span>
AsyncStorage<span class="token punctuation">,</span>
PickerIOS<span class="token punctuation">,</span>
Text<span class="token punctuation">,</span>
View
<span class="token punctuation">}</span> <span class="token operator">=</span> ReactNative<span class="token punctuation">;</span>
<span class="token keyword">var</span> PickerItemIOS <span class="token operator">=</span> PickerIOS<span class="token punctuation">.</span>Item<span class="token punctuation">;</span>
<span class="token keyword">var</span> STORAGE_KEY <span class="token operator">=</span> <span class="token string">&#x27;@AsyncStorageExample:key&#x27;</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> COLORS <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">&#x27;red&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;orange&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;yellow&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;green&#x27;</span><span class="token punctuation">,</span> <span class="token string">&#x27;blue&#x27;</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> BasicStorageExample <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">createClass<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
<span class="token function">componentDidMount<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_loadInitialState<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">done<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
async <span class="token function">_loadInitialState<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
<span class="token keyword">var</span> value <span class="token operator">=</span> await AsyncStorage<span class="token punctuation">.</span><span class="token function">getItem<span class="token punctuation">(</span></span>STORAGE_KEY<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>value <span class="token operator">!</span><span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState<span class="token punctuation">(</span></span><span class="token punctuation">{</span>selectedValue<span class="token punctuation">:</span> value<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">&#x27;Recovered selection from disk: &#x27;</span> <span class="token operator">+</span> value<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">&#x27;Initialized with no selection on disk.&#x27;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">&#x27;AsyncStorage error: &#x27;</span> <span class="token operator">+</span> error<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token function">getInitialState<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">{</span>
selectedValue<span class="token punctuation">:</span> COLORS<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
messages<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">var</span> color <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>selectedValue<span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>
&lt;View<span class="token operator">&gt;</span>
&lt;PickerIOS
selectedValue<span class="token operator">=</span><span class="token punctuation">{</span>color<span class="token punctuation">}</span>
onValueChange<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onValueChange<span class="token punctuation">}</span><span class="token operator">&gt;</span>
<span class="token punctuation">{</span>COLORS<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>value<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">(</span>
&lt;PickerItemIOS
key<span class="token operator">=</span><span class="token punctuation">{</span>value<span class="token punctuation">}</span>
value<span class="token operator">=</span><span class="token punctuation">{</span>value<span class="token punctuation">}</span>
label<span class="token operator">=</span><span class="token punctuation">{</span>value<span class="token punctuation">}</span>
<span class="token operator">/</span><span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">}</span>
&lt;<span class="token operator">/</span>PickerIOS<span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span>
<span class="token punctuation">{</span><span class="token string">&#x27;Selected: &#x27;</span><span class="token punctuation">}</span>
&lt;Text style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>color<span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token operator">&gt;</span>
<span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>selectedValue<span class="token punctuation">}</span>
&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span><span class="token punctuation">{</span><span class="token string">&#x27; &#x27;</span><span class="token punctuation">}</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;Text onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_removeStorage<span class="token punctuation">}</span><span class="token operator">&gt;</span>
Press here to remove from storage<span class="token punctuation">.</span>
&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span><span class="token punctuation">{</span><span class="token string">&#x27; &#x27;</span><span class="token punctuation">}</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
&lt;Text<span class="token operator">&gt;</span>Messages<span class="token punctuation">:</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span>
<span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>messages<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> &lt;Text key<span class="token operator">=</span><span class="token punctuation">{</span>m<span class="token punctuation">}</span><span class="token operator">&gt;</span><span class="token punctuation">{</span>m<span class="token punctuation">}</span>&lt;<span class="token operator">/</span>Text<span class="token operator">&gt;</span><span class="token punctuation">)</span><span class="token punctuation">}</span>
&lt;<span class="token operator">/</span>View<span class="token operator">&gt;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
async <span class="token function">_onValueChange<span class="token punctuation">(</span></span>selectedValue<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState<span class="token punctuation">(</span></span><span class="token punctuation">{</span>selectedValue<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
await AsyncStorage<span class="token punctuation">.</span><span class="token function">setItem<span class="token punctuation">(</span></span>STORAGE_KEY<span class="token punctuation">,</span> selectedValue<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">&#x27;Saved selection to disk: &#x27;</span> <span class="token operator">+</span> selectedValue<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">&#x27;AsyncStorage error: &#x27;</span> <span class="token operator">+</span> error<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
async <span class="token function">_removeStorage<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
await AsyncStorage<span class="token punctuation">.</span><span class="token function">removeItem<span class="token punctuation">(</span></span>STORAGE_KEY<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">&#x27;Selection removed from disk.&#x27;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">&#x27;AsyncStorage error: &#x27;</span> <span class="token operator">+</span> error<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token function">_appendMessage<span class="token punctuation">(</span></span>message<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState<span class="token punctuation">(</span></span><span class="token punctuation">{</span>messages<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>messages<span class="token punctuation">.</span><span class="token function">concat<span class="token punctuation">(</span></span>message<span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
exports<span class="token punctuation">.</span>title <span class="token operator">=</span> <span class="token string">&#x27;AsyncStorage&#x27;</span><span class="token punctuation">;</span>
exports<span class="token punctuation">.</span>description <span class="token operator">=</span> <span class="token string">&#x27;Asynchronous local disk storage.&#x27;</span><span class="token punctuation">;</span>
exports<span class="token punctuation">.</span>examples <span class="token operator">=</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
title<span class="token punctuation">:</span> <span class="token string">&#x27;Basics - getItem, setItem, removeItem&#x27;</span><span class="token punctuation">,</span>
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