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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"><link rel="shortcut icon" href="/react-native/img/favicon.png?2"><link rel="stylesheet" href="/react-native/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="/react-native/"><img src="/react-native/img/header_logo.png">React Native</a><div class="nav-site-wrapper"><ul class="nav-site nav-site-internal"><li><a href="/react-native/docs/getting-started.html" class="active">Docs</a></li><li><a href="/react-native/support.html" class="">Support</a></li><li><a href="https://github.com/facebook/react-native/releases" class="">Releases</a></li><li><a href="http://reactnative.cc" class="">Newsletter</a></li><li><a href="/react-native/showcase.html" class="">Showcase</a></li></ul><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 class="nav-docs-section"><h3>Quick Start</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/getting-started.html#content">Getting Started</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/android-setup.html#content">Android Setup</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/linux-windows-support.html#content">Linux and Windows Support</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/tutorial.html#content">Tutorial</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/videos.html#content">Videos</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/style.html#content">Style</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/images.html#content">Images</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/gesture-responder-system.html#content">Gesture Responder System</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/animations.html#content">Animations</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/accessibility.html#content">Accessibility</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/direct-manipulation.html#content">Direct Manipulation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/debugging.html#content">Debugging</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/testing.html#content">Testing</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/javascript-environment.html#content">JavaScript Environment</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/navigator-comparison.html#content">Navigator Comparison</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/known-issues.html#content">Known Issues</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/performance.html#content">Performance</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/upgrading.html#content">Upgrading</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/platform-specific-code.html#content">Platform Specific Code</a></li></ul></div><div class="nav-docs-section"><h3>Guides (iOS)</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/native-modules-ios.html#content">Native Modules</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/native-components-ios.html#content">Native UI Components</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/linking-libraries-ios.html#content">Linking Libraries</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/running-on-device-ios.html#content">Running On Device</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/embedded-app-ios.html#content">Integrating with Existing Apps</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/communication-ios.html#content">Communication between native and React Native</a></li></ul></div><div class="nav-docs-section"><h3>Guides (Android)</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/native-modules-android.html#content">Native Modules</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/native-components-android.html#content">Native UI Components</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/running-on-device-android.html#content">Running On Device</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/embedded-app-android.html#content">Integrating with Existing Apps</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/signed-apk-android.html#content">Generating Signed APK</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/android-ui-performance.html#content">Profiling Android UI Performance</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/android-building-from-source#content">Building React Native from source</a></li></ul></div><div class="nav-docs-section"><h3>components</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/activityindicatorios.html#content">ActivityIndicatorIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/datepickerios.html#content">DatePickerIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/drawerlayoutandroid.html#content">DrawerLayoutAndroid</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/image.html#content">Image</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/listview.html#content">ListView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/mapview.html#content">MapView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/modal.html#content">Modal</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/navigator.html#content">Navigator</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/navigatorios.html#content">NavigatorIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pickerios.html#content">PickerIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/progressbarandroid.html#content">ProgressBarAndroid</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/progressviewios.html#content">ProgressViewIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/scrollview.html#content">ScrollView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/segmentedcontrolios.html#content">SegmentedControlIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/sliderios.html#content">SliderIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/switchandroid.html#content">SwitchAndroid</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/switchios.html#content">SwitchIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/tabbarios.html#content">TabBarIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/tabbarios-item.html#content">TabBarIOS.Item</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/text.html#content">Text</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/textinput.html#content">TextInput</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/toolbarandroid.html#content">ToolbarAndroid</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablehighlight.html#content">TouchableHighlight</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablenativefeedback.html#content">TouchableNativeFeedback</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchableopacity.html#content">TouchableOpacity</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablewithoutfeedback.html#content">TouchableWithoutFeedback</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/view.html#content">View</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/viewpagerandroid.html#content">ViewPagerAndroid</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/webview.html#content">WebView</a></li></ul></div><div class="nav-docs-section"><h3>apis</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/actionsheetios.html#content">ActionSheetIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/alertios.html#content">AlertIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/animated.html#content">Animated</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appregistry.html#content">AppRegistry</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appstateios.html#content">AppStateIOS</a></li><li><a style="margin-left:0;" class="active" href="/react-native/docs/asyncstorage.html#content">AsyncStorage</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/backandroid.html#content">BackAndroid</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/cameraroll.html#content">CameraRoll</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/dimensions.html#content">Dimensions</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/interactionmanager.html#content">InteractionManager</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/layoutanimation.html#content">LayoutAnimation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/linkingios.html#content">LinkingIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/nativemethodsmixin.html#content">NativeMethodsMixin</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/netinfo.html#content">NetInfo</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/panresponder.html#content">PanResponder</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pixelratio.html#content">PixelRatio</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pushnotificationios.html#content">PushNotificationIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/statusbarios.html#content">StatusBarIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/stylesheet.html#content">StyleSheet</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/toastandroid.html#content">ToastAndroid</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/vibrationios.html#content">VibrationIOS</a></li></ul></div><div class="nav-docs-section"><h3>Polyfills</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/flexbox.html#content">Flexbox</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/geolocation.html#content">Geolocation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/network.html#content">Network</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/timers.html#content">Timers</a></li></ul></div></div><div class="inner-content"><a id="content"></a><h1>AsyncStorage</h1><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>This JS code is a simple facade over the native iOS implementation to provide
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="#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: string, callback?: ?(error: ?Error, result: ?string) =&gt; void)</span> <a class="hash-link" href="#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: string, value: string, callback?: ?(error: ?Error) =&gt; void)</span> <a class="hash-link" href="#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: string, callback?: ?(error: ?Error) =&gt; void)</span> <a class="hash-link" href="#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: string, value: string, callback?: ?(error: ?Error) =&gt; void)</span> <a class="hash-link" href="#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></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="clear"></a><span class="propType">static </span>clear<span class="propType">(callback?: ?(error: ?Error) =&gt; void)</span> <a class="hash-link" href="#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?: ?(error: ?Error, keys: ?Array&lt;string&gt;) =&gt; void)</span> <a class="hash-link" href="#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></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiget"></a><span class="propType">static </span>multiGet<span class="propType">(keys: Array&lt;string&gt;, callback?: ?(errors: ?Array&lt;Error&gt;, result: ?Array&lt;Array&lt;string&gt;&gt;) =&gt; void)</span> <a class="hash-link" href="#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></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiset"></a><span class="propType">static </span>multiSet<span class="propType">(keyValuePairs: Array&lt;Array&lt;string&gt;&gt;, callback?: ?(errors: ?Array&lt;Error&gt;) =&gt; void)</span> <a class="hash-link" href="#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></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiremove"></a><span class="propType">static </span>multiRemove<span class="propType">(keys: Array&lt;string&gt;, callback?: ?(errors: ?Array&lt;Error&gt;) =&gt; void)</span> <a class="hash-link" href="#multiremove">#</a></h4><div><p>Delete all the keys in the <code>keys</code> array. Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multimerge"></a><span class="propType">static </span>multiMerge<span class="propType">(keyValuePairs: Array&lt;Array&lt;string&gt;&gt;, callback?: ?(errors: ?Array&lt;Error&gt;) =&gt; void)</span> <a class="hash-link" href="#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></div></div></div></span></div><div><h3><a class="anchor" name="examples"></a><a class="edit-github" href="https://github.com/facebook/react-native/blob/master/Examples/UIExplorer/AsyncStorageExample.js">Edit on GitHub</a>Examples <a class="hash-link" href="#examples">#</a></h3><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-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> React<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<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>
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">:</span> ReactElement <span class="token punctuation">{</span> <span class="token keyword">return</span> &lt;BasicStorageExample <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><span class="token punctuation">,</span>
<span class="token punctuation">]</span><span class="token punctuation">;</span></div></div><div class="docs-prevnext"><a class="docs-next" href="backandroid.html#content">Next →</a></div></div><noscript></noscript></section><footer class="wrap"><div class="center">© 2015 Facebook Inc.</div></footer></div><div id="fb-root"></div><script>
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