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Website Deployment Script
48 lines
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HTML
48 lines
85 KiB
HTML
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href="/docs/native-modules-ios">iOS Native Modules</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/native-modules-setup">Native Modules NPM Package Setup</a></li></ul></li><li class="menu__list-item menu__list-item--collapsed"><a class="menu__link menu__link--sublist" href="#!">Native Components</a><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/native-components-android">Android Native UI Components</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/native-components-ios">iOS Native UI Components</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/direct-manipulation">Direct Manipulation</a></li></ul></li><li class="menu__list-item menu__list-item--collapsed"><a class="menu__link menu__link--sublist" href="#!">Guides (Android)</a><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/headless-js-android">Headless JS</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/signed-apk-android">Publishing to Google Play Store</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/removing-default-permissions">Removing Default Permissions</a></li></ul></li><li class="menu__list-item menu__list-item--collapsed"><a class="menu__link menu__link--sublist" href="#!">Guides (iOS)</a><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/linking-libraries-ios">Linking Libraries</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/running-on-simulator-ios">Running On Simulator</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/communication-ios">Communication between native and React Native</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/app-extensions">App Extensions</a></li></ul></li></ul></div></div></div><main class="docMainContainer_1rYT"><div class="container padding-vert--lg docItemWrapper_1Hme"><div class="row"><div class="col docItemCol_2AGf"><div class="docItemContainer_1tAC"><article><header><h1 class="docTitle_cWlf">Images</h1></header><div class="markdown"><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="static-image-resources"></a>Static Image Resources<a aria-hidden="true" tabindex="-1" class="hash-link" href="#static-image-resources" title="Direct link to heading">#</a></h2><p>React Native provides a unified way of managing images and other media assets in your Android and iOS apps. To add a static image to your app, place it somewhere in your source code tree and reference it like this:</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript function" style="color:#79b6f2">require</span><span class="token tag script language-javascript punctuation" style="color:#657b83">(</span><span class="token tag script language-javascript string" style="color:#8dc891">'./my-icon.png'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">)</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag punctuation" style="color:#657b83">/></span></div></div></div></div></div><p>The image name is resolved the same way JS modules are resolved. In the example above, the bundler will look for <code>my-icon.png</code> in the same folder as the component that requires it. Also, if you have <code>my-icon.ios.png</code> and <code>my-icon.android.png</code>, the bundler will pick the correct file for the platform.</p><p>You can also use the <code>@2x</code> and <code>@3x</code> suffixes to provide images for different screen densities. If you have the following file structure:</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token punctuation" style="color:#657b83">.</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain">├── button</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">js</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain">└── img</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> ├── check</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">png</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> ├── check@</span><span class="token number" style="color:#5a9bcf">2</span><span class="token plain">x</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">png</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> └── check@</span><span class="token number" style="color:#5a9bcf">3</span><span class="token plain">x</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">png</span></div></div></div></div></div><p>...and <code>button.js</code> code contains:</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript function" style="color:#79b6f2">require</span><span class="token tag script language-javascript punctuation" style="color:#657b83">(</span><span class="token tag script language-javascript string" style="color:#8dc891">'./img/check.png'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">)</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag punctuation" style="color:#657b83">/></span></div></div></div></div></div><p>...the bundler will bundle and serve the image corresponding to device's screen density. For example, <code>check@2x.png</code>, will be used on an iPhone 7, while<code>check@3x.png</code> will be used on an iPhone 7 Plus or a Nexus 5. If there is no image matching the screen density, the closest best option will be selected.</p><p>On Windows, you might need to restart the bundler if you add new images to your project.</p><p>Here are some benefits that you get:</p><ol><li>Same system on Android and iOS.</li><li>Images live in the same folder as your JavaScript code. Components are self-contained.</li><li>No global namespace, i.e. you don't have to worry about name collisions.</li><li>Only the images that are actually used will be packaged into your app.</li><li>Adding and changing images doesn't require app recompilation, you can refresh the simulator as you normally do.</li><li>The bundler knows the image dimensions, no need to duplicate it in the code.</li><li>Images can be distributed via <a href="https://www.npmjs.com/" target="_blank" rel="noopener noreferrer">npm</a> packages.</li></ol><p>In order for this to work, the image name in <code>require</code> has to be known statically.</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1">// GOOD</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript function" style="color:#79b6f2">require</span><span class="token tag script language-javascript punctuation" style="color:#657b83">(</span><span class="token tag script language-javascript string" style="color:#8dc891">'./my-icon.png'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">)</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag punctuation" style="color:#657b83">/></span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
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</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token comment" style="color:#93a1a1">// BAD</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">var</span><span class="token plain"> icon </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">this</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">props</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">active</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token operator" style="color:#fc929e">?</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">'my-icon-active'</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">'my-icon-inactive'</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript function" style="color:#79b6f2">require</span><span class="token tag script language-javascript punctuation" style="color:#657b83">(</span><span class="token tag script language-javascript string" style="color:#8dc891">'./'</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript operator" style="color:#fc929e">+</span><span class="token tag script language-javascript" style="color:#fc929e"> icon </span><span class="token tag script language-javascript operator" style="color:#fc929e">+</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'.png'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">)</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag punctuation" style="color:#657b83">/></span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
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</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token comment" style="color:#93a1a1">// GOOD</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">var</span><span class="token plain"> icon </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">this</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">props</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">active</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token operator" style="color:#fc929e">?</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">require</span><span class="token punctuation" style="color:#657b83">(</span><span class="token string" style="color:#8dc891">'./my-icon-active.png'</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">require</span><span class="token punctuation" style="color:#657b83">(</span><span class="token string" style="color:#8dc891">'./my-icon-inactive.png'</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e">icon</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag punctuation" style="color:#657b83">/></span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div><p>Note that image sources required this way include size (width, height) info for the Image. If you need to scale the image dynamically (i.e. via flex), you may need to manually set <code>{ width: undefined, height: undefined }</code> on the style attribute.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="static-non-image-resources"></a>Static Non-Image Resources<a aria-hidden="true" tabindex="-1" class="hash-link" href="#static-non-image-resources" title="Direct link to heading">#</a></h2><p>The <code>require</code> syntax described above can be used to statically include audio, video or document files in your project as well. Most common file types are supported including <code>.mp3</code>, <code>.wav</code>, <code>.mp4</code>, <code>.mov</code>, <code>.html</code> and <code>.pdf</code>. See <a href="https://github.com/facebook/metro/blob/master/packages/metro-config/src/defaults/defaults.js#L14-L44" target="_blank" rel="noopener noreferrer">bundler defaults</a> for the full list.</p><p>You can add support for other types by adding an <a href="https://facebook.github.io/metro/docs/configuration#resolver-options" target="_blank" rel="noopener noreferrer"><code>assetExts</code> resolver option</a> in your <a href="https://facebook.github.io/metro/docs/configuration" target="_blank" rel="noopener noreferrer">Metro configuration</a>.</p><p>A caveat is that videos must use absolute positioning instead of <code>flexGrow</code>, since size info is not currently passed for non-image assets. This limitation doesn't occur for videos that are linked directly into Xcode or the Assets folder for Android.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="images-from-hybrid-apps-resources"></a>Images From Hybrid App's Resources<a aria-hidden="true" tabindex="-1" class="hash-link" href="#images-from-hybrid-apps-resources" title="Direct link to heading">#</a></h2><p>If you are building a hybrid app (some UIs in React Native, some UIs in platform code) you can still use images that are already bundled into the app.</p><p>For images included via Xcode asset catalogs or in the Android drawable folder, use the image name without the extension:</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"> uri</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'app_icon'</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">style</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"> width</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">40</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"> height</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">40</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"></span><span class="token tag punctuation" style="color:#657b83">/></span></div></div></div></div></div><p>For images in the Android assets folder, use the <code>asset:/</code> scheme:</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"> uri</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'asset:/app_icon.png'</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">style</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"> width</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">40</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"> height</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">40</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"></span><span class="token tag punctuation" style="color:#657b83">/></span></div></div></div></div></div><p>These approaches provide no safety checks. It's up to you to guarantee that those images are available in the application. Also you have to specify image dimensions manually.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="network-images"></a>Network Images<a aria-hidden="true" tabindex="-1" class="hash-link" href="#network-images" title="Direct link to heading">#</a></h2><p>Many of the images you will display in your app will not be available at compile time, or you will want to load some dynamically to keep the binary size down. Unlike with static resources, <em>you will need to manually specify the dimensions of your image</em>. It's highly recommended that you use https as well in order to satisfy <a href="/docs/running-on-device#app-transport-security">App Transport Security</a> requirements on iOS.</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1">// GOOD</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e">uri</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'https://reactjs.org/logo-og.png'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">style</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e">width</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">400</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"> height</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">400</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag punctuation" style="color:#657b83">/></span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
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</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token comment" style="color:#93a1a1">// BAD</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e">uri</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'https://reactjs.org/logo-og.png'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag punctuation" style="color:#657b83">/></span></div></div></div></div></div><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="network-requests-for-images"></a>Network Requests for Images<a aria-hidden="true" tabindex="-1" class="hash-link" href="#network-requests-for-images" title="Direct link to heading">#</a></h3><p>If you would like to set such things as the HTTP-Verb, Headers or a Body along with the image request, you may do this by defining these properties on the source object:</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> uri</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'https://reactjs.org/logo-og.png'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> method</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'POST'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> headers</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> Pragma</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'no-cache'</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> body</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'Your Body goes here'</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">style</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"> width</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">400</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"> height</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">400</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"></span><span class="token tag punctuation" style="color:#657b83">/></span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="uri-data-images"></a>Uri Data Images<a aria-hidden="true" tabindex="-1" class="hash-link" href="#uri-data-images" title="Direct link to heading">#</a></h2><p>Sometimes, you might be getting encoded image data from a REST API call. You can use the <code>'data:'</code> uri scheme to use these images. Same as for network resources, <em>you will need to manually specify the dimensions of your image</em>.</p><blockquote><p>This is recommended for very small and dynamic images only, like icons in a list from a DB.</p></blockquote><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1">// include at least width and height!</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">style</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> width</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">51</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> height</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">51</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> resizeMode</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'contain'</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> uri</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADMAAAAzCAYAAAA6oTAqAAAAEXRFWHRTb2Z0d2FyZQBwbmdjcnVzaEB1SfMAAABQSURBVGje7dSxCQBACARB+2/ab8BEeQNhFi6WSYzYLYudDQYGBgYGBgYGBgYGBgYGBgZmcvDqYGBgmhivGQYGBgYGBgYGBgYGBgYGBgbmQw+P/eMrC5UTVAAAAABJRU5ErkJggg=='</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"></span><span class="token tag punctuation" style="color:#657b83">/></span></div></div></div></div></div><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="cache-control-ios-only"></a>Cache Control (iOS Only)<a aria-hidden="true" tabindex="-1" class="hash-link" href="#cache-control-ios-only" title="Direct link to heading">#</a></h3><p>In some cases you might only want to display an image if it is already in the local cache, i.e. a low resolution placeholder until a higher resolution is available. In other cases you do not care if the image is outdated and are willing to display an outdated image to save bandwidth. The <code>cache</code> source property gives you control over how the network layer interacts with the cache.</p><ul><li><code>default</code>: Use the native platforms default strategy.</li><li><code>reload</code>: The data for the URL will be loaded from the originating source. No existing cache data should be used to satisfy a URL load request.</li><li><code>force-cache</code>: The existing cached data will be used to satisfy the request, regardless of its age or expiration date. If there is no existing data in the cache corresponding the request, the data is loaded from the originating source.</li><li><code>only-if-cached</code>: The existing cache data will be used to satisfy a request, regardless of its age or expiration date. If there is no existing data in the cache corresponding to a URL load request, no attempt is made to load the data from the originating source, and the load is considered to have failed.</li></ul><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> uri</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'https://reactjs.org/logo-og.png'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> cache</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'only-if-cached'</span><span class="token tag script language-javascript" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">style</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"> width</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">400</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"> height</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">400</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"></span><span class="token tag punctuation" style="color:#657b83">/></span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="local-filesystem-images"></a>Local Filesystem Images<a aria-hidden="true" tabindex="-1" class="hash-link" href="#local-filesystem-images" title="Direct link to heading">#</a></h2><p>See <a href="https://github.com/react-native-community/react-native-cameraroll" target="_blank" rel="noopener noreferrer">CameraRoll</a> for an example of using local resources that are outside of <code>Images.xcassets</code>.</p><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="best-camera-roll-image"></a>Best Camera Roll Image<a aria-hidden="true" tabindex="-1" class="hash-link" href="#best-camera-roll-image" title="Direct link to heading">#</a></h3><p>iOS saves multiple sizes for the same image in your Camera Roll, it is very important to pick the one that's as close as possible for performance reasons. You wouldn't want to use the full quality 3264x2448 image as source when displaying a 200x200 thumbnail. If there's an exact match, React Native will pick it, otherwise it's going to use the first one that's at least 50% bigger in order to avoid blur when resizing from a close size. All of this is done by default so you don't have to worry about writing the tedious (and error prone) code to do it yourself.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="why-not-automatically-size-everything"></a>Why Not Automatically Size Everything?<a aria-hidden="true" tabindex="-1" class="hash-link" href="#why-not-automatically-size-everything" title="Direct link to heading">#</a></h2><p><em>In the browser</em> if you don't give a size to an image, the browser is going to render a 0x0 element, download the image, and then render the image based with the correct size. The big issue with this behavior is that your UI is going to jump all around as images load, this makes for a very bad user experience.</p><p><em>In React Native</em> this behavior is intentionally not implemented. It is more work for the developer to know the dimensions (or aspect ratio) of the remote image in advance, but we believe that it leads to a better user experience. Static images loaded from the app bundle via the <code>require('./my-icon.png')</code> syntax <em>can be automatically sized</em> because their dimensions are available immediately at the time of mounting.</p><p>For example, the result of <code>require('./my-icon.png')</code> might be:</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token punctuation" style="color:#657b83">{</span><span class="token string" style="color:#8dc891">"__packager_asset"</span><span class="token punctuation" style="color:#657b83">:</span><span class="token boolean" style="color:#ff8b50">true</span><span class="token punctuation" style="color:#657b83">,</span><span class="token string" style="color:#8dc891">"uri"</span><span class="token punctuation" style="color:#657b83">:</span><span class="token string" style="color:#8dc891">"my-icon.png"</span><span class="token punctuation" style="color:#657b83">,</span><span class="token string" style="color:#8dc891">"width"</span><span class="token punctuation" style="color:#657b83">:</span><span class="token number" style="color:#5a9bcf">591</span><span class="token punctuation" style="color:#657b83">,</span><span class="token string" style="color:#8dc891">"height"</span><span class="token punctuation" style="color:#657b83">:</span><span class="token number" style="color:#5a9bcf">573</span><span class="token punctuation" style="color:#657b83">}</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="source-as-an-object"></a>Source as an object<a aria-hidden="true" tabindex="-1" class="hash-link" href="#source-as-an-object" title="Direct link to heading">#</a></h2><p>In React Native, one interesting decision is that the <code>src</code> attribute is named <code>source</code> and doesn't take a string but an object with a <code>uri</code> attribute.</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Image</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e"> uri</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'something.jpg'</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag punctuation" style="color:#657b83">/></span></div></div></div></div></div><p>On the infrastructure side, the reason is that it allows us to attach metadata to this object. For example if you are using <code>require('./my-icon.png')</code>, then we add information about its actual location and size (don't rely on this fact, it might change in the future!). This is also future proofing, for example we may want to support sprites at some point, instead of outputting <code>{uri: ...}</code>, we can output <code>{uri: ..., crop: {left: 10, top: 50, width: 20, height: 40}}</code> and transparently support spriting on all the existing call sites.</p><p>On the user side, this lets you annotate the object with useful attributes such as the dimension of the image in order to compute the size it's going to be displayed in. Feel free to use it as your data structure to store more information about your image.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="background-image-via-nesting"></a>Background Image via Nesting<a aria-hidden="true" tabindex="-1" class="hash-link" href="#background-image-via-nesting" title="Direct link to heading">#</a></h2><p>A common feature request from developers familiar with the web is <code>background-image</code>. To handle this use case, you can use the <code><ImageBackground></code> component, which has the same props as <code><Image></code>, and add whatever children to it you would like to layer on top of it.</p><p>You might not want to use <code><ImageBackground></code> in some cases, since the implementation is basic. Refer to <code><ImageBackground></code>'s <a href="/docs/imagebackground">documentation</a> for more insight, and create your own custom component when needed.</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">return</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">ImageBackground</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">source</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript operator" style="color:#fc929e">...</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">style</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e">width</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'100%'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">,</span><span class="token tag script language-javascript" style="color:#fc929e"> height</span><span class="token tag script language-javascript punctuation" style="color:#657b83">:</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript string" style="color:#8dc891">'100%'</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag punctuation" style="color:#657b83">></span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Text</span><span class="token tag punctuation" style="color:#657b83">></span><span class="token plain">Inside</span><span class="token tag punctuation" style="color:#657b83"></</span><span class="token tag class-name" style="color:#fac863">Text</span><span class="token tag punctuation" style="color:#657b83">></span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#657b83"></</span><span class="token tag class-name" style="color:#fac863">ImageBackground</span><span class="token tag punctuation" style="color:#657b83">></span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div><p>Note that you must specify some width and height style attributes.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="ios-border-radius-styles"></a>iOS Border Radius Styles<a aria-hidden="true" tabindex="-1" class="hash-link" href="#ios-border-radius-styles" title="Direct link to heading">#</a></h2><p>Please note that the following corner specific, border radius style properties are currently ignored by iOS's image component:</p><ul><li><code>borderTopLeftRadius</code></li><li><code>borderTopRightRadius</code></li><li><code>borderBottomLeftRadius</code></li><li><code>borderBottomRightRadius</code></li></ul><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="off-thread-decoding"></a>Off-thread Decoding<a aria-hidden="true" tabindex="-1" class="hash-link" href="#off-thread-decoding" title="Direct link to heading">#</a></h2><p>Image decoding can take more than a frame-worth of time. This is one of the major sources of frame drops on the web because decoding is done in the main thread. In React Native, image decoding is done in a different thread. In practice, you already need to handle the case when the image is not downloaded yet, so displaying the placeholder for a few more frames while it is decoding does not require any code change.</p></div></article><div class="docMetadata margin-vert--xl"><div class="row"><div class="col"><a href="https://github.com/facebook/react-native-website/blob/master/website/versioned_docs/version-0.63/images.md" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="1.2em" width="1.2em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 40 40" style="margin-right:0.3em;vertical-align:sub"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col text--right"><em><small class="docMetadata-updated">Last updated on <time datetime="2020-10-29T04:19:29.000Z" class="docLastUpdatedAt_1gIo">10/29/2020</time></small></em></div></div></div><div class="margin-vert--lg"><nav class="pagination-nav" aria-label="Blog list page navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/docs/flexbox"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« Layout with Flexbox</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/docs/colors"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Color Reference »</div></a></div></nav></div></div></div><div class="col col--3"><div class="tableOfContents_3iuQ"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#static-image-resources" class="table-of-contents__link">Static Image Resources</a></li><li><a href="#static-non-image-resources" class="table-of-contents__link">Static Non-Image Resources</a></li><li><a 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