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134 lines
46 KiB
HTML
<!DOCTYPE html><html><head><title>Image</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="Image"><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="stylesheet" href="css/prism.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">0.46</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:10px;" class="" href="docs/getting-started.html">Getting Started</a></li><li><a style="margin-left:10px;" class="" href="docs/tutorial.html">Tutorial</a></li><li><a style="margin-left:10px;" class="" href="docs/props.html">Props</a></li><li><a style="margin-left:10px;" class="" href="docs/state.html">State</a></li><li><a style="margin-left:10px;" class="" href="docs/style.html">Style</a></li><li><a style="margin-left:10px;" class="" href="docs/height-and-width.html">Height and Width</a></li><li><a style="margin-left:10px;" class="" href="docs/flexbox.html">Layout with Flexbox</a></li><li><a style="margin-left:10px;" class="" href="docs/handling-text-input.html">Handling Text Input</a></li><li><a style="margin-left:10px;" class="" href="docs/handling-touches.html">Handling Touches</a></li><li><a style="margin-left:10px;" class="" href="docs/using-a-scrollview.html">Using a ScrollView</a></li><li><a style="margin-left:10px;" class="" href="docs/using-a-listview.html">Using List Views</a></li><li><a style="margin-left:10px;" class="" href="docs/network.html">Networking</a></li><li><a style="margin-left:10px;" 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:10px;" class="" href="docs/components-and-apis.html">Components and APIs</a></li><li><a style="margin-left:10px;" class="" href="docs/platform-specific-code.html">Platform Specific Code</a></li><li><a style="margin-left:10px;" class="" href="docs/navigation.html">Navigating Between Screens</a></li><li><a style="margin-left:10px;" class="" href="docs/images.html">Images</a></li><li><a style="margin-left:10px;" class="" href="docs/animations.html">Animations</a></li><li><a style="margin-left:10px;" class="" href="docs/accessibility.html">Accessibility</a></li><li><a style="margin-left:10px;" class="" href="docs/timers.html">Timers</a></li><li><a style="margin-left:10px;" class="" href="docs/debugging.html">Debugging</a></li><li><a style="margin-left:10px;" class="" href="docs/performance.html">Performance</a></li><li><a style="margin-left:10px;" class="" href="docs/gesture-responder-system.html">Gesture Responder System</a></li><li><a style="margin-left:10px;" class="" href="docs/javascript-environment.html">JavaScript Environment</a></li><li><a style="margin-left:10px;" class="" href="docs/direct-manipulation.html">Direct Manipulation</a></li><li><a style="margin-left:10px;" class="" href="docs/colors.html">Color Reference</a></li><li><a style="margin-left:10px;" class="" href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a></li><li><a style="margin-left:10px;" class="" href="docs/running-on-device.html">Running On Device</a></li><li><a style="margin-left:10px;" class="" href="docs/upgrading.html">Upgrading to new React Native versions</a></li><li><a style="margin-left:10px;" class="" href="docs/contributing.html">How to Contribute</a></li><li><a style="margin-left:10px;" class="" href="docs/testing.html">Testing your Changes</a></li><li><a style="margin-left:10px;" class="" href="docs/understanding-cli.html">Understanding the CLI</a></li></ul></div><div class="nav-docs-section"><h3>Guides (iOS)</h3><ul><li><a style="margin-left:10px;" class="" href="docs/native-modules-ios.html">Native Modules</a></li><li><a style="margin-left:10px;" class="" href="docs/native-components-ios.html">Native UI Components</a></li><li><a style="margin-left:10px;" class="" href="docs/linking-libraries-ios.html">Linking Libraries</a></li><li><a style="margin-left:10px;" class="" href="docs/running-on-simulator-ios.html">Running On Simulator</a></li><li><a style="margin-left:10px;" class="" href="docs/communication-ios.html">Communication between native and React Native</a></li><li><a style="margin-left:10px;" class="" href="docs/building-for-apple-tv.html">Building For Apple TV</a></li></ul></div><div class="nav-docs-section"><h3>Guides (Android)</h3><ul><li><a style="margin-left:10px;" class="" href="docs/native-modules-android.html">Native Modules</a></li><li><a style="margin-left:10px;" class="" href="docs/native-components-android.html">Native UI Components</a></li><li><a style="margin-left:10px;" class="" href="docs/headless-js-android.html">Headless JS</a></li><li><a style="margin-left:10px;" class="" href="docs/signed-apk-android.html">Generating Signed APK</a></li><li><a style="margin-left:10px;" 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:10px;" class="" href="docs/activityindicator.html">ActivityIndicator</a></li><li><a style="margin-left:10px;" class="" href="docs/button.html">Button</a></li><li><a style="margin-left:10px;" class="" href="docs/datepickerios.html">DatePickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/drawerlayoutandroid.html">DrawerLayoutAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/flatlist.html">FlatList</a></li><li><a style="margin-left:10px;" class="active" href="docs/image.html">Image</a></li><li><a style="margin-left:10px;" class="" href="docs/keyboardavoidingview.html">KeyboardAvoidingView</a></li><li><a style="margin-left:10px;" class="" href="docs/listview.html">ListView</a></li><li><a style="margin-left:10px;" class="" href="docs/modal.html">Modal</a></li><li><a style="margin-left:10px;" class="" href="docs/navigatorios.html">NavigatorIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/picker.html">Picker</a></li><li><a style="margin-left:10px;" class="" href="docs/pickerios.html">PickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/progressbarandroid.html">ProgressBarAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/progressviewios.html">ProgressViewIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/refreshcontrol.html">RefreshControl</a></li><li><a style="margin-left:10px;" class="" href="docs/scrollview.html">ScrollView</a></li><li><a style="margin-left:10px;" class="" href="docs/sectionlist.html">SectionList</a></li><li><a style="margin-left:10px;" class="" href="docs/segmentedcontrolios.html">SegmentedControlIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/slider.html">Slider</a></li><li><a style="margin-left:10px;" class="" href="docs/snapshotviewios.html">SnapshotViewIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/statusbar.html">StatusBar</a></li><li><a style="margin-left:10px;" class="" href="docs/switch.html">Switch</a></li><li><a style="margin-left:10px;" class="" href="docs/tabbarios.html">TabBarIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/tabbarios-item.html">TabBarIOS.Item</a></li><li><a style="margin-left:10px;" class="" href="docs/text.html">Text</a></li><li><a style="margin-left:10px;" class="" href="docs/textinput.html">TextInput</a></li><li><a style="margin-left:10px;" class="" href="docs/toolbarandroid.html">ToolbarAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablehighlight.html">TouchableHighlight</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablenativefeedback.html">TouchableNativeFeedback</a></li><li><a style="margin-left:10px;" class="" href="docs/touchableopacity.html">TouchableOpacity</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablewithoutfeedback.html">TouchableWithoutFeedback</a></li><li><a style="margin-left:10px;" class="" href="docs/view.html">View</a></li><li><a style="margin-left:10px;" class="" href="docs/viewpagerandroid.html">ViewPagerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/virtualizedlist.html">VirtualizedList</a></li><li><a style="margin-left:10px;" class="" href="docs/webview.html">WebView</a></li></ul></div><div class="nav-docs-section"><h3>APIs</h3><ul><li><a style="margin-left:10px;" class="" href="docs/accessibilityinfo.html">AccessibilityInfo</a></li><li><a style="margin-left:10px;" class="" href="docs/actionsheetios.html">ActionSheetIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/adsupportios.html">AdSupportIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/alert.html">Alert</a></li><li><a style="margin-left:10px;" class="" href="docs/alertios.html">AlertIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/animated.html">Animated</a></li><li><a style="margin-left:10px;" class="" href="docs/appregistry.html">AppRegistry</a></li><li><a style="margin-left:10px;" class="" href="docs/appstate.html">AppState</a></li><li><a style="margin-left:10px;" class="" href="docs/asyncstorage.html">AsyncStorage</a></li><li><a style="margin-left:10px;" class="" href="docs/backandroid.html">BackAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/backhandler.html">BackHandler</a></li><li><a style="margin-left:10px;" class="" href="docs/cameraroll.html">CameraRoll</a></li><li><a style="margin-left:10px;" class="" href="docs/clipboard.html">Clipboard</a></li><li><a style="margin-left:10px;" class="" href="docs/datepickerandroid.html">DatePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/dimensions.html">Dimensions</a></li><li><a style="margin-left:10px;" class="" href="docs/easing.html">Easing</a></li><li><a style="margin-left:10px;" class="" href="docs/geolocation.html">Geolocation</a></li><li><a style="margin-left:10px;" class="" href="docs/imageeditor.html">ImageEditor</a></li><li><a style="margin-left:10px;" class="" href="docs/imagepickerios.html">ImagePickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestore.html">ImageStore</a></li><li><a style="margin-left:10px;" class="" href="docs/interactionmanager.html">InteractionManager</a></li><li><a style="margin-left:10px;" class="" href="docs/keyboard.html">Keyboard</a></li><li><a style="margin-left:10px;" class="" href="docs/layoutanimation.html">LayoutAnimation</a></li><li><a style="margin-left:10px;" class="" href="docs/linking.html">Linking</a></li><li><a style="margin-left:10px;" class="" href="docs/netinfo.html">NetInfo</a></li><li><a style="margin-left:10px;" class="" href="docs/panresponder.html">PanResponder</a></li><li><a style="margin-left:10px;" class="" href="docs/permissionsandroid.html">PermissionsAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/pixelratio.html">PixelRatio</a></li><li><a style="margin-left:10px;" class="" href="docs/pushnotificationios.html">PushNotificationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/settings.html">Settings</a></li><li><a style="margin-left:10px;" class="" href="docs/share.html">Share</a></li><li><a style="margin-left:10px;" class="" href="docs/statusbarios.html">StatusBarIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/stylesheet.html">StyleSheet</a></li><li><a style="margin-left:10px;" class="" href="docs/systrace.html">Systrace</a></li><li><a style="margin-left:10px;" class="" href="docs/timepickerandroid.html">TimePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/toastandroid.html">ToastAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/vibration.html">Vibration</a></li><li><a style="margin-left:10px;" class="" href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/layout-props.html">Layout Props</a></li><li><a style="margin-left:10px;" class="" href="docs/shadow-props.html">Shadow Props</a></li><li><a style="margin-left:10px;" class="" href="docs/viewproptypes.html">ViewPropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/viewstyleproptypes.html">ViewStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/textstyleproptypes.html">TextStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestyleproptypes.html">ImageStylePropTypes</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="image"></a>Image <a class="hash-link" href="docs/image.html#image">#</a></h1><div><div><p>A React component for displaying different types of images,
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including network images, static resources, temporary local images, and
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images from local disk, such as the camera roll.</p><p>This example shows both fetching and displaying an image from local
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storage as well as one from network.</p><div class="web-player"><div class="prism language-javascript"><span class="token keyword">import</span> React<span class="token punctuation">,</span> <span class="token punctuation">{</span> Component <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'react'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> <span class="token punctuation">{</span> AppRegistry<span class="token punctuation">,</span> View<span class="token punctuation">,</span> Image <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'react-native'</span><span class="token punctuation">;</span>
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<span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">class</span> <span class="token class-name">DisplayAnImage</span> <span class="token keyword">extends</span> <span class="token class-name">Component</span> <span class="token punctuation">{</span>
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<span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token punctuation">(</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>Image
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source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'./img/favicon.png'</span><span class="token punctuation">)</span><span class="token punctuation">}</span>
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<span class="token operator">/</span><span class="token operator">></span>
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<span class="token operator"><</span>Image
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style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>width<span class="token punctuation">:</span> <span class="token number">50</span><span class="token punctuation">,</span> height<span class="token punctuation">:</span> <span class="token number">50</span><span class="token punctuation">}</span><span class="token punctuation">}</span>
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source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>uri<span class="token punctuation">:</span> <span class="token string">'https://facebook.github.io/react/img/logo_og.png'</span><span class="token punctuation">}</span><span class="token punctuation">}</span>
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<span class="token operator">/</span><span class="token operator">></span>
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<span class="token operator"><</span><span class="token operator">/</span>View<span class="token operator">></span>
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<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token comment" spellcheck="true">
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// skip this line if using Create React Native App
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</span>AppRegistry<span class="token punctuation">.</span><span class="token function">registerComponent</span><span class="token punctuation">(</span><span class="token string">'DisplayAnImage'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> DisplayAnImage<span class="token punctuation">)</span><span class="token punctuation">;</span></div><iframe style="margin-top:4px;" width="880" height="420" data-src="//cdn.rawgit.com/dabbott/react-native-web-player/gh-v1.2.6/index.html#code=import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20AppRegistry%2C%20View%2C%20Image%20%7D%20from%20'react-native'%3B%0A%0Aexport%20default%20class%20DisplayAnImage%20extends%20Component%20%7B%0A%20%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%3E%0A%20%20%20%20%20%20%20%20%3CImage%0A%20%20%20%20%20%20%20%20%20%20source%3D%7Brequire('.%2Fimg%2Ffavicon.png')%7D%0A%20%20%20%20%20%20%20%20%2F%3E%0A%20%20%20%20%20%20%20%20%3CImage%0A%20%20%20%20%20%20%20%20%20%20style%3D%7B%7Bwidth%3A%2050%2C%20height%3A%2050%7D%7D%0A%20%20%20%20%20%20%20%20%20%20source%3D%7B%7Buri%3A%20'https%3A%2F%2Ffacebook.github.io%2Freact%2Fimg%2Flogo_og.png'%7D%7D%0A%20%20%20%20%20%20%20%20%2F%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A%0A%2F%2F%20skip%20this%20line%20if%20using%20Create%20React%20Native%20App%0AAppRegistry.registerComponent('DisplayAnImage'%2C%20()%20%3D%3E%20DisplayAnImage)%3B" frameborder="0"></iframe></div><p>You can also add <code>style</code> to an image:</p><div class="web-player"><div class="prism language-javascript"><span class="token keyword">import</span> React<span class="token punctuation">,</span> <span class="token punctuation">{</span> Component <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'react'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> <span class="token punctuation">{</span> AppRegistry<span class="token punctuation">,</span> View<span class="token punctuation">,</span> Image<span class="token punctuation">,</span> StyleSheet <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'react-native'</span><span class="token punctuation">;</span>
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<span class="token keyword">const</span> styles <span class="token operator">=</span> StyleSheet<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
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stretch<span class="token punctuation">:</span> <span class="token punctuation">{</span>
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width<span class="token punctuation">:</span> <span class="token number">50</span><span class="token punctuation">,</span>
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height<span class="token punctuation">:</span> <span class="token number">200</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">class</span> <span class="token class-name">DisplayAnImageWithStyle</span> <span class="token keyword">extends</span> <span class="token class-name">Component</span> <span class="token punctuation">{</span>
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<span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token punctuation">(</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>Image
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style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>stretch<span class="token punctuation">}</span>
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source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'./img/favicon.png'</span><span class="token punctuation">)</span><span class="token punctuation">}</span>
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<span class="token operator">/</span><span class="token operator">></span>
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<span class="token operator"><</span><span class="token operator">/</span>View<span class="token operator">></span>
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<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token comment" spellcheck="true">
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// skip these lines if using Create React Native App
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</span>AppRegistry<span class="token punctuation">.</span><span class="token function">registerComponent</span><span class="token punctuation">(</span>
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<span class="token string">'DisplayAnImageWithStyle'</span><span class="token punctuation">,</span>
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<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> DisplayAnImageWithStyle
|
|
<span class="token punctuation">)</span><span class="token punctuation">;</span></div><iframe style="margin-top:4px;" width="880" height="420" data-src="//cdn.rawgit.com/dabbott/react-native-web-player/gh-v1.2.6/index.html#code=import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20AppRegistry%2C%20View%2C%20Image%2C%20StyleSheet%20%7D%20from%20'react-native'%3B%0A%0Aconst%20styles%20%3D%20StyleSheet.create(%7B%0A%20%20stretch%3A%20%7B%0A%20%20%20%20width%3A%2050%2C%0A%20%20%20%20height%3A%20200%0A%20%20%7D%0A%7D)%3B%0A%0Aexport%20default%20class%20DisplayAnImageWithStyle%20extends%20Component%20%7B%0A%20%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%3E%0A%20%20%20%20%20%20%20%20%3CImage%0A%20%20%20%20%20%20%20%20%20%20style%3D%7Bstyles.stretch%7D%0A%20%20%20%20%20%20%20%20%20%20source%3D%7Brequire('.%2Fimg%2Ffavicon.png')%7D%0A%20%20%20%20%20%20%20%20%2F%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A%0A%2F%2F%20skip%20these%20lines%20if%20using%20Create%20React%20Native%20App%0AAppRegistry.registerComponent(%0A%20%20'DisplayAnImageWithStyle'%2C%0A%20%20()%20%3D%3E%20DisplayAnImageWithStyle%0A)%3B" frameborder="0"></iframe></div><h3><a class="anchor" name="gif-and-webp-support-on-android"></a>GIF and WebP support on Android <a class="hash-link" href="docs/image.html#gif-and-webp-support-on-android">#</a></h3><p>When building your own native code, GIF and WebP are not supported by default on Android.</p><p>You will need to add some optional modules in <code>android/app/build.gradle</code>, depending on the needs of your app.</p><div class="prism language-javascript">dependencies <span class="token punctuation">{</span>
|
|
<span class="token comment" spellcheck="true"> // If your app supports Android versions before Ice Cream Sandwich (API level 14)
|
|
</span> compile <span class="token string">'com.facebook.fresco:animated-base-support:1.0.1'</span>
|
|
|
|
<span class="token comment" spellcheck="true"> // For animated GIF support
|
|
</span> compile <span class="token string">'com.facebook.fresco:animated-gif:1.0.1'</span>
|
|
|
|
<span class="token comment" spellcheck="true"> // For WebP support, including animated WebP
|
|
</span> compile <span class="token string">'com.facebook.fresco:animated-webp:1.0.1'</span>
|
|
compile <span class="token string">'com.facebook.fresco:webpsupport:1.0.1'</span>
|
|
|
|
<span class="token comment" spellcheck="true"> // For WebP support, without animations
|
|
</span> compile <span class="token string">'com.facebook.fresco:webpsupport:1.0.1'</span>
|
|
<span class="token punctuation">}</span></div><p>Also, if you use GIF with ProGuard, you will need to add this rule in <code>proguard-rules.pro</code> :</p><div class="prism language-javascript"><span class="token operator">-</span>keep <span class="token keyword">class</span> <span class="token class-name">com<span class="token punctuation">.</span>facebook<span class="token punctuation">.</span>imagepipeline<span class="token punctuation">.</span>animated<span class="token punctuation">.</span>factory<span class="token punctuation">.</span>AnimatedFactoryImpl</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">public</span> <span class="token function">AnimatedFactoryImpl</span><span class="token punctuation">(</span>com<span class="token punctuation">.</span>facebook<span class="token punctuation">.</span>imagepipeline<span class="token punctuation">.</span>bitmaps<span class="token punctuation">.</span>PlatformBitmapFactory<span class="token punctuation">,</span> com<span class="token punctuation">.</span>facebook<span class="token punctuation">.</span>imagepipeline<span class="token punctuation">.</span>core<span class="token punctuation">.</span>ExecutorSupplier<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span></div></div><h3><a class="anchor" name="props"></a>Props <a class="hash-link" href="docs/image.html#props">#</a></h3><div class="props"><div class="prop"><h4 class="propTitle"><a class="anchor" name="blurradius"></a>blurRadius?: <span class="propType">number</span> <a class="hash-link" href="docs/image.html#blurradius">#</a></h4><div><p>blurRadius: the blur radius of the blur filter added to the image</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onerror"></a>onError?: <span class="propType">function</span> <a class="hash-link" href="docs/image.html#onerror">#</a></h4><div><p>Invoked on load error with <code>{nativeEvent: {error}}</code>.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onlayout"></a>onLayout?: <span class="propType">function</span> <a class="hash-link" href="docs/image.html#onlayout">#</a></h4><div><p>Invoked on mount and layout changes with
|
|
<code>{nativeEvent: {layout: {x, y, width, height}}}</code>.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onload"></a>onLoad?: <span class="propType">function</span> <a class="hash-link" href="docs/image.html#onload">#</a></h4><div><p>Invoked when load completes successfully.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onloadend"></a>onLoadEnd?: <span class="propType">function</span> <a class="hash-link" href="docs/image.html#onloadend">#</a></h4><div><p>Invoked when load either succeeds or fails.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onloadstart"></a>onLoadStart?: <span class="propType">function</span> <a class="hash-link" href="docs/image.html#onloadstart">#</a></h4><div><p>Invoked on load start.</p><p>e.g., <code>onLoadStart={(e) => this.setState({loading: true})}</code></p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="resizemode"></a>resizeMode?: <span class="propType">enum('cover', 'contain', 'stretch', 'repeat', 'center')</span> <a class="hash-link" href="docs/image.html#resizemode">#</a></h4><div><p>Determines how to resize the image when the frame doesn't match the raw
|
|
image dimensions.</p><ul><li><p><code>cover</code>: Scale the image uniformly (maintain the image's aspect ratio)
|
|
so that both dimensions (width and height) of the image will be equal
|
|
to or larger than the corresponding dimension of the view (minus padding).</p></li><li><p><code>contain</code>: Scale the image uniformly (maintain the image's aspect ratio)
|
|
so that both dimensions (width and height) of the image will be equal to
|
|
or less than the corresponding dimension of the view (minus padding).</p></li><li><p><code>stretch</code>: Scale width and height independently, This may change the
|
|
aspect ratio of the src.</p></li><li><p><code>repeat</code>: Repeat the image to cover the frame of the view. The
|
|
image will keep it's size and aspect ratio. (iOS only)</p></li></ul></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="source"></a>source?: <span class="propType">ImageSourcePropType</span> <a class="hash-link" href="docs/image.html#source">#</a></h4><div><p>The image source (either a remote URL or a local file resource).</p><p>This prop can also contain several remote URLs, specified together with
|
|
their width and height and potentially with scale/other URI arguments.
|
|
The native side will then choose the best <code>uri</code> to display based on the
|
|
measured size of the image container. A <code>cache</code> property can be added to
|
|
control how networked request interacts with the local cache.</p><p>The currently supported formats are <code>png</code>, <code>jpg</code>, <code>jpeg</code>, <code>bmp</code>, <code>gif</code>,
|
|
<code>webp</code> (Android only), <code>psd</code> (iOS only).</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="style"></a>style?: <span class="propType">style</span> <a class="hash-link" href="docs/image.html#style">#</a></h4><div class="compactProps"><div class="prop"><h6 class="propTitle"><a href="docs/layout-props.html#props">Layout Props...</a></h6></div><div class="prop"><h6 class="propTitle"><a href="docs/shadow-props.html#props">Shadow Props...</a></h6></div><div class="prop"><h6 class="propTitle"><a href="docs/transforms.html#props">Transforms...</a></h6></div><div class="prop"><h6 class="propTitle">backfaceVisibility <span class="propType">enum('visible', 'hidden')</span> </h6></div><div class="prop"><h6 class="propTitle">backgroundColor <span class="propType"><a href="docs/colors.html">color</a></span> </h6></div><div class="prop"><h6 class="propTitle">borderBottomLeftRadius <span class="propType">number</span> </h6></div><div class="prop"><h6 class="propTitle">borderBottomRightRadius <span class="propType">number</span> </h6></div><div class="prop"><h6 class="propTitle">borderColor <span class="propType"><a href="docs/colors.html">color</a></span> </h6></div><div class="prop"><h6 class="propTitle">borderRadius <span class="propType">number</span> </h6></div><div class="prop"><h6 class="propTitle">borderTopLeftRadius <span class="propType">number</span> </h6></div><div class="prop"><h6 class="propTitle">borderTopRightRadius <span class="propType">number</span> </h6></div><div class="prop"><h6 class="propTitle">borderWidth <span class="propType">number</span> </h6></div><div class="prop"><h6 class="propTitle">opacity <span class="propType">number</span> </h6></div><div class="prop"><h6 class="propTitle">overflow <span class="propType">enum('visible', 'hidden')</span> </h6></div><div class="prop"><h6 class="propTitle">resizeMode <span class="propType">Object.keys(ImageResizeMode)</span> </h6></div><div class="prop"><h6 class="propTitle">tintColor <span class="propType"><a href="docs/colors.html">color</a></span> <div><p>Changes the color of all the non-transparent pixels to the tintColor.</p></div></h6></div><div class="prop"><h6 class="propTitle"><span class="platform">android</span>overlayColor <span class="propType">string</span> <div><p>When the image has rounded corners, specifying an overlayColor will
|
|
cause the remaining space in the corners to be filled with a solid color.
|
|
This is useful in cases which are not supported by the Android
|
|
implementation of rounded corners:
|
|
- Certain resize modes, such as 'contain'
|
|
- Animated GIFs</p><p>A typical way to use this prop is with images displayed on a solid
|
|
background and setting the <code>overlayColor</code> to the same color
|
|
as the background.</p><p>For details of how this works under the hood, see
|
|
<a href="http://frescolib.org/docs/rounded-corners-and-circles.html">http://frescolib.org/docs/rounded-corners-and-circles.html</a></p></div></h6></div></div><div><blockquote><p><code>ImageResizeMode</code> is an <code>Enum</code> for different image resizing modes, set via the
|
|
<code>resizeMode</code> style property on <code>Image</code> components. The values are <code>contain</code>, <code>cover</code>,
|
|
<code>stretch</code>, <code>center</code>, <code>repeat</code>.</p></blockquote></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="testid"></a>testID?: <span class="propType">string</span> <a class="hash-link" href="docs/image.html#testid">#</a></h4><div><p>A unique identifier for this element to be used in UI Automation
|
|
testing scripts.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="resizemethod"></a><span class="platform">android</span>resizeMethod?: <span class="propType">enum('auto', 'resize', 'scale')</span> <a class="hash-link" href="docs/image.html#resizemethod">#</a></h4><div><p>The mechanism that should be used to resize the image when the image's dimensions
|
|
differ from the image view's dimensions. Defaults to <code>auto</code>.</p><ul><li><p><code>auto</code>: Use heuristics to pick between <code>resize</code> and <code>scale</code>.</p></li><li><p><code>resize</code>: A software operation which changes the encoded image in memory before it
|
|
gets decoded. This should be used instead of <code>scale</code> when the image is much larger
|
|
than the view.</p></li><li><p><code>scale</code>: The image gets drawn downscaled or upscaled. Compared to <code>resize</code>, <code>scale</code> is
|
|
faster (usually hardware accelerated) and produces higher quality images. This
|
|
should be used if the image is smaller than the view. It should also be used if the
|
|
image is slightly bigger than the view.</p></li></ul><p>More details about <code>resize</code> and <code>scale</code> can be found at <a href="http://frescolib.org/docs/resizing-rotating.html">http://frescolib.org/docs/resizing-rotating.html</a>.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="accessibilitylabel"></a><span class="platform">ios</span>accessibilityLabel?: <span class="propType">node</span> <a class="hash-link" href="docs/image.html#accessibilitylabel">#</a></h4><div><p>The text that's read by the screen reader when the user interacts with
|
|
the image.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="accessible"></a><span class="platform">ios</span>accessible?: <span class="propType">bool</span> <a class="hash-link" href="docs/image.html#accessible">#</a></h4><div><p>When true, indicates the image is an accessibility element.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="capinsets"></a><span class="platform">ios</span>capInsets?: <span class="propType">{top: number, left: number, bottom: number, right: number}</span> <a class="hash-link" href="docs/image.html#capinsets">#</a></h4><div><p>When the image is resized, the corners of the size specified
|
|
by <code>capInsets</code> will stay a fixed size, but the center content and borders
|
|
of the image will be stretched. This is useful for creating resizable
|
|
rounded buttons, shadows, and other resizable assets. More info in the
|
|
<a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIImage_Class/index.html#//apple_ref/occ/instm/UIImage/resizableImageWithCapInsets" target="_blank">official Apple documentation</a>.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="defaultsource"></a><span class="platform">ios</span>defaultSource?: <span class="propType"><span><span><span>{<span><span><span>uri: string</span>, </span><span><span>width: number</span>, </span><span><span>height: number</span>, </span><span>scale: number</span></span>}</span>, </span>number</span></span> <a class="hash-link" href="docs/image.html#defaultsource">#</a></h4><div><p>A static image to display while loading the image source.</p><ul><li><code>uri</code> - a string representing the resource identifier for the image, which
|
|
should be either a local file path or the name of a static image resource
|
|
(which should be wrapped in the <code>require('./path/to/image.png')</code> function).</li><li><code>width</code>, <code>height</code> - can be specified if known at build time, in which case
|
|
these will be used to set the default <code><Image/></code> component dimensions.</li><li><code>scale</code> - used to indicate the scale factor of the image. Defaults to 1.0 if
|
|
unspecified, meaning that one image pixel equates to one display point / DIP.</li><li><code>number</code> - Opaque type returned by something like <code>require('./image.jpg')</code>.</li></ul></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onpartialload"></a><span class="platform">ios</span>onPartialLoad?: <span class="propType">function</span> <a class="hash-link" href="docs/image.html#onpartialload">#</a></h4><div><p>Invoked when a partial load of the image is complete. The definition of
|
|
what constitutes a "partial load" is loader specific though this is meant
|
|
for progressive JPEG loads.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onprogress"></a><span class="platform">ios</span>onProgress?: <span class="propType">function</span> <a class="hash-link" href="docs/image.html#onprogress">#</a></h4><div><p>Invoked on download progress with <code>{nativeEvent: {loaded, total}}</code>.</p></div></div></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="docs/image.html#methods">#</a></h3><div class="props"><div class="prop"><h4 class="methodTitle"><a class="anchor" name="getsize"></a><span class="methodType">static </span>getSize<span class="methodType">(uri: string, success: function, failure?: function): </span> <a class="hash-link" href="docs/image.html#getsize">#</a></h4><div><p>Retrieve the width and height (in pixels) of an image prior to displaying it.
|
|
This method can fail if the image cannot be found, or fails to download.</p><p>In order to retrieve the image dimensions, the image may first need to be
|
|
loaded or downloaded, after which it will be cached. This means that in
|
|
principle you could use this method to preload images, however it is not
|
|
optimized for that purpose, and may in future be implemented in a way that
|
|
does not fully load/download the image data. A proper, supported way to
|
|
preload images will be provided as a separate API.</p><p>Does not work for static image resources.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>uri<br><br><div><span>string</span></div></td><td class="description"><div><p>The location of the image.</p></div></td></tr><tr><td>success<br><br><div><span>function</span></div></td><td class="description"><div><p>The function that will be called if the image was successfully found and width
|
|
and height retrieved.</p></div></td></tr><tr><td>[failure]<br><br><div><span>function</span></div></td><td class="description"><div><p>The function that will be called if there was an error, such as failing to
|
|
to retrieve the image.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="prefetch"></a><span class="methodType">static </span>prefetch<span class="methodType">(url: string): </span> <a class="hash-link" href="docs/image.html#prefetch">#</a></h4><div><p>Prefetches a remote image for later use by downloading it to the disk
|
|
cache</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>url<br><br><div><span>string</span></div></td><td class="description"><div><p>The remote location of the image.</p></div></td></tr></tbody></table></div></div></div></span></div><p class="edit-page-block">You can <a target="_blank" href="https://github.com/facebook/react-native/blob/master/Libraries/Image/Image.ios.js">edit the content above on GitHub</a> and send us a pull request!</p><div class="docs-prevnext"><a class="docs-prev" href="docs/flatlist.html#content">← Prev</a><a class="docs-next" href="docs/keyboardavoidingview.html#content">Next →</a></div></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://react-native.canny.io/feature-requests" 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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