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<!DOCTYPE html><html><head><title>Accessibility</title><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta name="viewport" content="width=device-width"><meta property="fb:app_id" content="1677033832619985"><meta property="fb:admins" content="121800083"><meta property="og:site_name" content="React Native"><meta property="og:title" content="Accessibility"><meta property="og:url" content="https://facebook.github.io/react-native/index.html"><meta property="og:image" content="https://facebook.github.io/react-native/img/opengraph.png"><meta property="og:description" content="A framework for building native apps using React"><meta name="twitter:site" content="@reactnative"><meta name="twitter:card" content="summary_large_image"><meta property="og:type" content="website"><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"><link rel="alternate" type="application/rss+xml" title="React Native Blog" href="https://facebook.github.io/react-native/blog/feed.xml"><link href="//cdn-images.mailchimp.com/embedcode/horizontal-slim-10_7.css" rel="stylesheet" type="text/css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><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'));</script><script>window.twttr=(function(d,s, id){var js,fjs=d.getElementsByTagName(s)[0],t=window.twttr||{};if(d.getElementById(id))return t;js=d.createElement(s);js.id=id;js.src='https://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js, fjs);t._e = [];t.ready = function(f) {t._e.push(f);};return t;}(document, 'script', 'twitter-wjs'));</script><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">0.41</a><div class="nav-site-wrapper"><ul class="nav-site nav-site-internal"><li><a href="docs/getting-started.html" class="active" data-target=".nav-docs">Docs</a></li><li><a href="/react-native/support.html" class="">Help</a></li><li><a href="/react-native/showcase.html" class="">Showcase</a></li><li><a href="/react-native/blog/" class="">Blog</a></li></ul><div class="algolia-search-wrapper"><input id="algolia-doc-search" tabindex="0" 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 class="nav-docs-viewport"><div class="nav-docs-section"><h3>The Basics</h3><ul><li><a style="margin-left:0;" class="" href="docs/getting-started.html">Getting Started</a></li><li><a style="margin-left:0;" class="" href="docs/tutorial.html">Tutorial</a></li><li><a style="margin-left:0;" class="" href="docs/props.html">Props</a></li><li><a style="margin-left:0;" class="" href="docs/state.html">State</a></li><li><a style="margin-left:0;" class="" href="docs/style.html">Style</a></li><li><a style="margin-left:0;" class="" href="docs/height-and-width.html">Height and Width</a></li><li><a style="margin-left:0;" class="" href="docs/flexbox.html">Layout with Flexbox</a></li><li><a style="margin-left:0;" class="" href="docs/handling-text-input.html">Handling Text Input</a></li><li><a style="margin-left:0;" class="" href="docs/using-a-scrollview.html">Using a ScrollView</a></li><li><a style="margin-left:0;" class="" href="docs/using-a-listview.html">Using a ListView</a></li><li><a style="margin-left:0;" class="" href="docs/network.html">Networking</a></li><li><a style="margin-left:0;" class="" href="docs/using-navigators.html">Using Navigators</a></li><li><a style="margin-left:0;" class="" href="docs/more-resources.html">More Resources</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:0;" class="" href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a></li><li><a style="margin-left:0;" class="" href="docs/colors.html">Colors</a></li><li><a style="margin-left:0;" class="" href="docs/images.html">Images</a></li><li><a style="margin-left:0;" class="" href="docs/handling-touches.html">Handling Touches</a></li><li><a style="margin-left:0;" class="" href="docs/animations.html">Animations</a></li><li><a style="margin-left:0;" class="active" href="docs/accessibility.html">Accessibility</a></li><li><a style="margin-left:0;" class="" href="docs/timers.html">Timers</a></li><li><a style="margin-left:0;" class="" href="docs/direct-manipulation.html">Direct Manipulation</a></li><li><a style="margin-left:0;" class="" href="docs/debugging.html">Debugging</a></li><li><a style="margin-left:0;" class="" href="docs/testing.html">Testing</a></li><li><a style="margin-left:0;" class="" href="docs/running-on-device.html">Running On Device</a></li><li><a style="margin-left:0;" class="" href="docs/javascript-environment.html">JavaScript Environment</a></li><li><a style="margin-left:0;" class="" href="docs/navigation.html">Navigation</a></li><li><a style="margin-left:0;" class="" href="docs/performance.html">Performance</a></li><li><a style="margin-left:0;" class="" href="docs/understanding-cli.html">Understanding the CLI</a></li><li><a style="margin-left:0;" class="" href="docs/upgrading.html">Upgrading</a></li><li><a style="margin-left:0;" class="" href="docs/platform-specific-code.html">Platform Specific Code</a></li><li><a style="margin-left:0;" class="" href="docs/gesture-responder-system.html">Gesture Responder System</a></li></ul></div><div class="nav-docs-section"><h3>Guides (iOS)</h3><ul><li><a style="margin-left:0;" class="" href="docs/native-modules-ios.html">Native Modules</a></li><li><a style="margin-left:0;" class="" href="docs/native-components-ios.html">Native UI Components</a></li><li><a style="margin-left:0;" class="" href="docs/linking-libraries-ios.html">Linking Libraries</a></li><li><a style="margin-left:0;" class="" href="docs/running-on-simulator-ios.html">Running On Simulator</a></li><li><a style="margin-left:0;" class="" href="docs/communication-ios.html">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="docs/native-modules-android.html">Native Modules</a></li><li><a style="margin-left:0;" class="" href="docs/native-components-android.html">Native UI Components</a></li><li><a style="margin-left:0;" class="" href="docs/headless-js-android.html">Headless JS</a></li><li><a style="margin-left:0;" class="" href="docs/signed-apk-android.html">Generating Signed APK</a></li><li><a style="margin-left:0;" class="" href="docs/android-ui-performance.html">Profiling Android UI Performance</a></li><li><a style="margin-left:0;" class="" href="docs/android-building-from-source.html">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="docs/activityindicator.html">ActivityIndicator</a></li><li><a style="margin-left:0;" class="" href="docs/button.html">Button</a></li><li><a style="margin-left:0;" class="" href="docs/datepickerios.html">DatePickerIOS</a></li><li><a style="margin-left:0;" class="" href="docs/drawerlayoutandroid.html">DrawerLayoutAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/image.html">Image</a></li><li><a style="margin-left:0;" class="" href="docs/keyboardavoidingview.html">KeyboardAvoidingView</a></li><li><a style="margin-left:0;" class="" href="docs/listview.html">ListView</a></li><li><a style="margin-left:0;" class="" href="docs/mapview.html">MapView</a></li><li><a style="margin-left:0;" class="" href="docs/modal.html">Modal</a></li><li><a style="margin-left:0;" class="" href="docs/navigator.html">Navigator</a></li><li><a style="margin-left:0;" class="" href="docs/navigatorios.html">NavigatorIOS</a></li><li><a style="margin-left:0;" class="" href="docs/picker.html">Picker</a></li><li><a style="margin-left:0;" class="" href="docs/pickerios.html">PickerIOS</a></li><li><a style="margin-left:0;" class="" href="docs/progressbarandroid.html">ProgressBarAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/progressviewios.html">ProgressViewIOS</a></li><li><a style="margin-left:0;" class="" href="docs/refreshcontrol.html">RefreshControl</a></li><li><a style="margin-left:0;" class="" href="docs/scrollview.html">ScrollView</a></li><li><a style="margin-left:0;" class="" href="docs/segmentedcontrolios.html">SegmentedControlIOS</a></li><li><a style="margin-left:0;" class="" href="docs/slider.html">Slider</a></li><li><a style="margin-left:0;" class="" href="docs/snapshotviewios.html">SnapshotViewIOS</a></li><li><a style="margin-left:0;" class="" href="docs/statusbar.html">StatusBar</a></li><li><a style="margin-left:0;" class="" href="docs/switch.html">Switch</a></li><li><a style="margin-left:0;" class="" href="docs/tabbarios.html">TabBarIOS</a></li><li><a style="margin-left:0;" class="" href="docs/tabbarios-item.html">TabBarIOS.Item</a></li><li><a style="margin-left:0;" class="" href="docs/text.html">Text</a></li><li><a style="margin-left:0;" class="" href="docs/textinput.html">TextInput</a></li><li><a style="margin-left:0;" class="" href="docs/toolbarandroid.html">ToolbarAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/touchablehighlight.html">TouchableHighlight</a></li><li><a style="margin-left:0;" class="" href="docs/touchablenativefeedback.html">TouchableNativeFeedback</a></li><li><a style="margin-left:0;" class="" href="docs/touchableopacity.html">TouchableOpacity</a></li><li><a style="margin-left:0;" class="" href="docs/touchablewithoutfeedback.html">TouchableWithoutFeedback</a></li><li><a style="margin-left:0;" class="" href="docs/view.html">View</a></li><li><a style="margin-left:0;" class="" href="docs/viewpagerandroid.html">ViewPagerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/webview.html">WebView</a></li></ul></div><div class="nav-docs-section"><h3>apis</h3><ul><li><a style="margin-left:0;" class="" href="docs/actionsheetios.html">ActionSheetIOS</a></li><li><a style="margin-left:0;" class="" href="docs/adsupportios.html">AdSupportIOS</a></li><li><a style="margin-left:0;" class="" href="docs/alert.html">Alert</a></li><li><a style="margin-left:0;" class="" href="docs/alertios.html">AlertIOS</a></li><li><a style="margin-left:0;" class="" href="docs/animated.html">Animated</a></li><li><a style="margin-left:0;" class="" href="docs/appregistry.html">AppRegistry</a></li><li><a style="margin-left:0;" class="" href="docs/appstate.html">AppState</a></li><li><a style="margin-left:0;" class="" href="docs/asyncstorage.html">AsyncStorage</a></li><li><a style="margin-left:0;" class="" href="docs/backandroid.html">BackAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/cameraroll.html">CameraRoll</a></li><li><a style="margin-left:0;" class="" href="docs/clipboard.html">Clipboard</a></li><li><a style="margin-left:0;" class="" href="docs/datepickerandroid.html">DatePickerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/dimensions.html">Dimensions</a></li><li><a style="margin-left:0;" class="" href="docs/easing.html">Easing</a></li><li><a style="margin-left:0;" class="" href="docs/geolocation.html">Geolocation</a></li><li><a style="margin-left:0;" class="" href="docs/imageeditor.html">ImageEditor</a></li><li><a style="margin-left:0;" class="" href="docs/imagepickerios.html">ImagePickerIOS</a></li><li><a style="margin-left:0;" class="" href="docs/imagestore.html">ImageStore</a></li><li><a style="margin-left:0;" class="" href="docs/interactionmanager.html">InteractionManager</a></li><li><a style="margin-left:0;" class="" href="docs/keyboard.html">Keyboard</a></li><li><a style="margin-left:0;" class="" href="docs/layoutanimation.html">LayoutAnimation</a></li><li><a style="margin-left:0;" class="" href="docs/linking.html">Linking</a></li><li><a style="margin-left:0;" class="" href="docs/nativemethodsmixin.html">NativeMethodsMixin</a></li><li><a style="margin-left:0;" class="" href="docs/netinfo.html">NetInfo</a></li><li><a style="margin-left:0;" class="" href="docs/panresponder.html">PanResponder</a></li><li><a style="margin-left:0;" class="" href="docs/permissionsandroid.html">PermissionsAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/pixelratio.html">PixelRatio</a></li><li><a style="margin-left:0;" class="" href="docs/pushnotificationios.html">PushNotificationIOS</a></li><li><a style="margin-left:0;" class="" href="docs/settings.html">Settings</a></li><li><a style="margin-left:0;" class="" href="docs/share.html">Share</a></li><li><a style="margin-left:0;" class="" href="docs/statusbarios.html">StatusBarIOS</a></li><li><a style="margin-left:0;" class="" href="docs/stylesheet.html">StyleSheet</a></li><li><a style="margin-left:0;" class="" href="docs/systrace.html">Systrace</a></li><li><a style="margin-left:0;" class="" href="docs/timepickerandroid.html">TimePickerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/toastandroid.html">ToastAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/vibration.html">Vibration</a></li><li><a style="margin-left:0;" class="" href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:0;" class="" href="docs/layout-props.html">Layout Props</a></li><li><a style="margin-left:0;" class="" href="docs/shadow-props.html">Shadow Props</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="accessibility"></a>Accessibility <a class="hash-link" href="docs/accessibility.html#accessibility">#</a></h1><div><h2><a class="anchor" name="native-app-accessibility-ios-and-android"></a>Native App Accessibility (iOS and Android) <a class="hash-link" href="docs/accessibility.html#native-app-accessibility-ios-and-android">#</a></h2><p>Both iOS and Android provide APIs for making apps accessible to people with disabilities. In addition, both platforms provide bundled assistive technologies, like the screen readers VoiceOver (iOS) and TalkBack (Android) for the visually impaired. Similarly, in React Native we have included APIs designed to provide developers with support for making apps more accessible. Take note, iOS and Android differ slightly in their approaches, and thus the React Native implementations may vary by platform.</p><h2><a class="anchor" name="making-apps-accessible"></a>Making Apps Accessible <a class="hash-link" href="docs/accessibility.html#making-apps-accessible">#</a></h2><h3><a class="anchor" name="accessibility-properties"></a>Accessibility properties <a class="hash-link" href="docs/accessibility.html#accessibility-properties">#</a></h3><h4><a class="anchor" name="accessible-ios-android"></a>accessible (iOS, Android) <a class="hash-link" href="docs/accessibility.html#accessible-ios-android">#</a></h4><p>When <code>true</code>, indicates that the view is an accessibility element. When a view is an accessibility element, it groups its children into a single selectable component. By default, all touchable elements are accessible.</p><p>On Android, ‘accessible={true}’ property for a react-native View will be translated into native ‘focusable={true}’.</p><div class="prism language-javascript"><View accessible<span class="token operator">=</span><span class="token punctuation">{</span><span class="token boolean">true</span><span class="token punctuation">}</span><span class="token operator">></span>
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<Text<span class="token operator">></span>text one<<span class="token operator">/</span>Text<span class="token operator">></span>
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<Text<span class="token operator">></span>text two<<span class="token operator">/</span>Text<span class="token operator">></span>
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<<span class="token operator">/</span>View<span class="token operator">></span></div><p>In the above example, we can't get accessibility focus separately on 'text one' and 'text two'. Instead we get focus on a parent view with 'accessible' property.</p><h4><a class="anchor" name="accessibilitylabel-ios-android"></a>accessibilityLabel (iOS, Android) <a class="hash-link" href="docs/accessibility.html#accessibilitylabel-ios-android">#</a></h4><p>When a view is marked as accessible, it is a good practice to set an accessibilityLabel on the view, so that people who use VoiceOver know what element they have selected. VoiceOver will read this string when a user selects the associated element.</p><p>To use, set the <code>accessibilityLabel</code> property to a custom string on your View:</p><div class="prism language-javascript"><TouchableOpacity accessible<span class="token operator">=</span><span class="token punctuation">{</span><span class="token boolean">true</span><span class="token punctuation">}</span> accessibilityLabel<span class="token operator">=</span><span class="token punctuation">{</span><span class="token string">'Tap me!'</span><span class="token punctuation">}</span> onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onPress<span class="token punctuation">}</span><span class="token operator">></span>
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<View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>button<span class="token punctuation">}</span><span class="token operator">></span>
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<Text style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>buttonText<span class="token punctuation">}</span><span class="token operator">></span>Press me<span class="token operator">!</span><<span class="token operator">/</span>Text<span class="token operator">></span>
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<<span class="token operator">/</span>View<span class="token operator">></span>
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<<span class="token operator">/</span>TouchableOpacity<span class="token operator">></span></div><p>In the above example, the <code>accessibilityLabel</code> on the TouchableOpacity element would default to "Press me!". The label is constructed by concatenating all Text node children separated by spaces.</p><h4><a class="anchor" name="accessibilitytraits-ios"></a>accessibilityTraits (iOS) <a class="hash-link" href="docs/accessibility.html#accessibilitytraits-ios">#</a></h4><p>Accessibility traits tell a person using VoiceOver what kind of element they have selected. Is this element a label? A button? A header? These questions are answered by <code>accessibilityTraits</code>.</p><p>To use, set the <code>accessibilityTraits</code> property to one of (or an array of) accessibility trait strings:</p><ul><li><strong>none</strong> Used when the element has no traits.</li><li><strong>button</strong> Used when the element should be treated as a button.</li><li><strong>link</strong> Used when the element should be treated as a link.</li><li><strong>header</strong> Used when an element acts as a header for a content section (e.g. the title of a navigation bar).</li><li><strong>search</strong> Used when the text field element should also be treated as a search field.</li><li><strong>image</strong> Used when the element should be treated as an image. Can be combined with button or link, for example.</li><li><strong>selected</strong> Used when the element is selected. For example, a selected row in a table or a selected button within a segmented control.</li><li><strong>plays</strong> Used when the element plays its own sound when activated.</li><li><strong>key</strong> Used when the element acts as a keyboard key.</li><li><strong>text</strong> Used when the element should be treated as static text that cannot change.</li><li><strong>summary</strong> Used when an element can be used to provide a quick summary of current conditions in the app when the app first launches. For example, when Weather first launches, the element with today's weather conditions is marked with this trait.</li><li><strong>disabled</strong> Used when the control is not enabled and does not respond to user input.</li><li><strong>frequentUpdates</strong> Used when the element frequently updates its label or value, but too often to send notifications. Allows an accessibility client to poll for changes. A stopwatch would be an example.</li><li><strong>startsMedia</strong> Used when activating an element starts a media session (e.g. playing a movie, recording audio) that should not be interrupted by output from an assistive technology, like VoiceOver.</li><li><strong>adjustable</strong> Used when an element can be "adjusted" (e.g. a slider).</li><li><strong>allowsDirectInteraction</strong> Used when an element allows direct touch interaction for VoiceOver users (for example, a view representing a piano keyboard).</li><li><strong>pageTurn</strong> Informs VoiceOver that it should scroll to the next page when it finishes reading the contents of the element.</li></ul><h4><a class="anchor" name="onaccessibilitytap-ios"></a>onAccessibilityTap (iOS) <a class="hash-link" href="docs/accessibility.html#onaccessibilitytap-ios">#</a></h4><p>Use this property to assign a custom function to be called when someone activates an accessible element by double tapping on it while it's selected.</p><h4><a class="anchor" name="onmagictap-ios"></a>onMagicTap (iOS) <a class="hash-link" href="docs/accessibility.html#onmagictap-ios">#</a></h4><p>Assign this property to a custom function which will be called when someone performs the "magic tap" gesture, which is a double-tap with two fingers. A magic tap function should perform the most relevant action a user could take on a component. In the Phone app on iPhone, a magic tap answers a phone call, or ends the current one. If the selected element does not have an <code>onMagicTap</code> function, the system will traverse up the view hierarchy until it finds a view that does.</p><h4><a class="anchor" name="accessibilitycomponenttype-android"></a>accessibilityComponentType (Android) <a class="hash-link" href="docs/accessibility.html#accessibilitycomponenttype-android">#</a></h4><p>In some cases, we also want to alert the end user of the type of selected component (i.e., that it is a “button”). If we were using native buttons, this would work automatically. Since we are using javascript, we need to provide a bit more context for TalkBack. To do so, you must specify the ‘accessibilityComponentType’ property for any UI component. For instances, we support ‘button’, ‘radiobutton_checked’ and ‘radiobutton_unchecked’ and so on.</p><div class="prism language-javascript"><TouchableWithoutFeedback accessibilityComponentType<span class="token operator">=</span>”button”
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onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onPress<span class="token punctuation">}</span><span class="token operator">></span>
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<View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>button<span class="token punctuation">}</span><span class="token operator">></span>
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<Text style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>buttonText<span class="token punctuation">}</span><span class="token operator">></span>Press me<span class="token operator">!</span><<span class="token operator">/</span>Text<span class="token operator">></span>
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<<span class="token operator">/</span>View<span class="token operator">></span>
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<<span class="token operator">/</span>TouchableWithoutFeedback<span class="token operator">></span></div><p>In the above example, the TouchableWithoutFeedback is being announced by TalkBack as a native Button.</p><h4><a class="anchor" name="accessibilityliveregion-android"></a>accessibilityLiveRegion (Android) <a class="hash-link" href="docs/accessibility.html#accessibilityliveregion-android">#</a></h4><p>When components dynamically change, we want TalkBack to alert the end user. This is made possible by the ‘accessibilityLiveRegion’ property. It can be set to ‘none’, ‘polite’ and ‘assertive’:</p><ul><li><strong>none</strong> Accessibility services should not announce changes to this view.</li><li><strong>polite</strong> Accessibility services should announce changes to this view.</li><li><strong>assertive</strong> Accessibility services should interrupt ongoing speech to immediately announce changes to this view.</li></ul><div class="prism language-javascript"><TouchableWithoutFeedback onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_addOne<span class="token punctuation">}</span><span class="token operator">></span>
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<View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>embedded<span class="token punctuation">}</span><span class="token operator">></span>
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<Text<span class="token operator">></span>Click me<<span class="token operator">/</span>Text<span class="token operator">></span>
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<<span class="token operator">/</span>View<span class="token operator">></span>
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<<span class="token operator">/</span>TouchableWithoutFeedback<span class="token operator">></span>
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<Text accessibilityLiveRegion<span class="token operator">=</span><span class="token string">"polite"</span><span class="token operator">></span>
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Clicked <span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>count<span class="token punctuation">}</span> times
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<<span class="token operator">/</span>Text<span class="token operator">></span></div><p>In the above example method _addOne changes the state.count variable. As soon as an end user clicks the TouchableWithoutFeedback, TalkBack reads text in the Text view because of its 'accessibilityLiveRegion=”polite”' property.</p><h4><a class="anchor" name="importantforaccessibility-android"></a>importantForAccessibility (Android) <a class="hash-link" href="docs/accessibility.html#importantforaccessibility-android">#</a></h4><p>In the case of two overlapping UI components with the same parent, default accessibility focus can have unpredictable behavior. The ‘importantForAccessibility’ property will resolve this by controlling if a view fires accessibility events and if it is reported to accessibility services. It can be set to ‘auto’, ‘yes’, ‘no’ and ‘no-hide-descendants’ (the last value will force accessibility services to ignore the component and all of its children).</p><div class="prism language-javascript"><View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>container<span class="token punctuation">}</span><span class="token operator">></span>
|
||
<View style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>position<span class="token punctuation">:</span> <span class="token string">'absolute'</span><span class="token punctuation">,</span> left<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">,</span> top<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">,</span> right<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">,</span> height<span class="token punctuation">:</span> <span class="token number">100</span><span class="token punctuation">,</span>
|
||
backgroundColor<span class="token punctuation">:</span> <span class="token string">'green'</span><span class="token punctuation">}</span><span class="token punctuation">}</span> importantForAccessibility<span class="token operator">=</span>”yes”<span class="token operator">></span>
|
||
<Text<span class="token operator">></span> First layout <<span class="token operator">/</span>Text<span class="token operator">></span>
|
||
<<span class="token operator">/</span>View<span class="token operator">></span>
|
||
<View style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>position<span class="token punctuation">:</span> <span class="token string">'absolute'</span><span class="token punctuation">,</span> left<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">,</span> top<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">,</span> right<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">,</span> height<span class="token punctuation">:</span> <span class="token number">100</span><span class="token punctuation">,</span>
|
||
backgroundColor<span class="token punctuation">:</span> <span class="token string">'yellow'</span><span class="token punctuation">}</span><span class="token punctuation">}</span> importantForAccessibility<span class="token operator">=</span>”no<span class="token operator">-</span>hide<span class="token operator">-</span>descendants”<span class="token operator">></span>
|
||
<Text<span class="token operator">></span> Second layout <<span class="token operator">/</span>Text<span class="token operator">></span>
|
||
<<span class="token operator">/</span>View<span class="token operator">></span>
|
||
<<span class="token operator">/</span>View<span class="token operator">></span></div><p>In the above example, the yellow layout and its descendants are completely invisible to TalkBack and all other accessibility services. So we can easily use overlapping views with the same parent without confusing TalkBack.</p><h3><a class="anchor" name="sending-accessibility-events-android"></a>Sending Accessibility Events (Android) <a class="hash-link" href="docs/accessibility.html#sending-accessibility-events-android">#</a></h3><p>Sometimes it is useful to trigger an accessibility event on a UI component (i.e. when a custom view appears on a screen or a custom radio button has been selected). Native UIManager module exposes a method ‘sendAccessibilityEvent’ for this purpose. It takes two arguments: view tag and a type of an event.</p><div class="prism language-javascript">_onPress<span class="token punctuation">:</span> <span class="token keyword">function</span><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>state<span class="token punctuation">.</span>radioButton <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>radioButton <span class="token operator">===</span> “radiobutton_checked” <span class="token operator">?</span>
|
||
“radiobutton_unchecked” <span class="token punctuation">:</span> “radiobutton_checked”<span class="token punctuation">;</span>
|
||
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>radioButton <span class="token operator">===</span> “radiobutton_checked”<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
RCTUIManager<span class="token punctuation">.</span><span class="token function">sendAccessibilityEvent<span class="token punctuation">(</span></span>
|
||
ReactNative<span class="token punctuation">.</span><span class="token function">findNodeHandle<span class="token punctuation">(</span></span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
|
||
RCTUIManager<span class="token punctuation">.</span>AccessibilityEventTypes<span class="token punctuation">.</span>typeViewClicked<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span>
|
||
<span class="token punctuation">}</span>
|
||
|
||
<CustomRadioButton
|
||
accessibleComponentType<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>radioButton<span class="token punctuation">}</span>
|
||
onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onPress<span class="token punctuation">}</span><span class="token operator">/</span><span class="token operator">></span></div><p>In the above example we've created a custom radio button that now behaves like a native one. More specifically, TalkBack now correctly announces changes to the radio button selection.</p><h2><a class="anchor" name="testing-voiceover-support-ios"></a>Testing VoiceOver Support (iOS) <a class="hash-link" href="docs/accessibility.html#testing-voiceover-support-ios">#</a></h2><p>To enable VoiceOver, go to the Settings app on your iOS device. Tap General, then Accessibility. There you will find many tools that people use to use to make their devices more usable, such as bolder text, increased contrast, and VoiceOver.</p><p>To enable VoiceOver, tap on VoiceOver under "Vision" and toggle the switch that appears at the top.</p><p>At the very bottom of the Accessibility settings, there is an "Accessibility Shortcut". You can use this to toggle VoiceOver by triple clicking the Home button.</p></div><div class="docs-prevnext"><a class="docs-prev" href="docs/animations.html#content">← Prev</a><a class="docs-next" href="docs/timers.html#content">Next →</a></div><p class="edit-page-block">You can <a target="_blank" href="https://github.com/facebook/react-native/blob/master/docs/Accessibility.md">edit the content above on GitHub</a> and send us a pull request!</p></div></section><footer class="nav-footer"><section class="sitemap"><a href="/react-native" class="nav-home"><img src="img/header_logo.png" alt="React Native" width="66" height="58"></a><div><h5><a href="docs/">Docs</a></h5><a href="docs/getting-started.html">Getting Started</a><a href="docs/tutorial.html">Tutorial</a><a href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a><a href="docs/more-resources.html">More Resources</a></div><div><h5><a href="/react-native/support.html">Community</a></h5><a href="/react-native/showcase.html">Showcase</a><a href="http://www.meetup.com/topics/react-native/" target="_blank">Upcoming Events</a><a href="https://www.facebook.com/groups/react.native.community" target="_blank">Facebook Group</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a></div><div><h5><a href="/react-native/support.html">Help</a></h5><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Stack Overflow</a><a href="https://discord.gg/0ZcbPKXt5bZjGY5n">Reactiflux Chat</a><a href="/react-native/versions.html" target="_blank">Latest Releases</a><a href="https://productpains.com/product/react-native/" target="_blank">Feature Requests</a></div><div><h5>More</h5><a href="/react-native/blog">Blog</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://facebook.github.io/react/" target="_blank">React</a></div></section><section class="newsletter"><div id="mc_embed_signup"><form action="//reactnative.us10.list-manage.com/subscribe/post?u=db0dd948e2b729ee62625b1a8&id=47cd41008f" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate><div id="mc_embed_signup_scroll"><label for="mce-EMAIL"><h5>Get the React Native Newsletter</h5></label><input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="email address" required><div style="position:absolute;left:-5000px;" aria-hidden="true"><input type="text" name="b_db0dd948e2b729ee62625b1a8_47cd41008f" tabindex="-1" value=""></div><div class="clear"><input type="submit" value="Sign up" name="subscribe" id="mc-embedded-subscribe" class="button"></div></div></form></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 © 2017 Facebook Inc.</section></footer></div><div id="fb-root"></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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