mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Travis CI
47 lines
15 KiB
HTML
47 lines
15 KiB
HTML
<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><title>React Native | Build Native Apps Using React</title><meta name="viewport" content="width=device-width"><meta property="og:title" content="React Native | Build Native Apps Using React"><meta property="og:type" content="website"><meta property="og:url" content="http://facebook.github.io/react-native/index.html"><meta property="og:image" content="http://facebook.github.io/react-native/img/opengraph.png"><meta property="og:description" content="Build Native Apps Using React"><link rel="shortcut icon" href="/react-native/img/favicon.png"><link rel="stylesheet" href="/react-native/css/react-native.css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><div class="container"><div class="nav-main"><div class="wrap"><a class="nav-home" href="/react-native/"><img src="/react-native/img/logo.png">React Native</a><ul class="nav-site"><li><a href="/react-native/docs/getting-started.html#content" class="active">docs</a></li><li><a href="/react-native/support.html" class="">support</a></li><li><a href="http://github.com/facebook/react-native" class="">github</a></li></ul></div></div><section class="content wrap documentationContent"><div class="nav-docs"><div class="nav-docs-section"><h3>Quick Start</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/getting-started.html#content">Getting Started</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/network.html#content">Network</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pixels.html#content">Physical vs Logical Pixels</a></li><li><a style="margin-left:0;" class="active" href="/react-native/docs/style.html#content">Style</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/timers.html#content">Timers</a></li></ul></div><div class="nav-docs-section"><h3>components</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/activityindicatorios.html#content">ActivityIndicatorIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/datepickerios.html#content">DatePickerIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/expandingtext.html#content">ExpandingText</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/image.html#content">Image</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/listview.html#content">ListView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/mapview.html#content">MapView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/navigatorios.html#content">NavigatorIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pickerios.html#content">PickerIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/scrollview.html#content">ScrollView</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/slider.html#content">Slider</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/switchios.html#content">SwitchIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/tabbarios.html#content">TabBarIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/text.html#content">Text</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/textinput.html#content">TextInput</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablehighlight.html#content">TouchableHighlight</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchableopacity.html#content">TouchableOpacity</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/touchablewithoutfeedback.html#content">TouchableWithoutFeedback</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/view.html#content">View</a></li></ul></div><div class="nav-docs-section"><h3>apis</h3><ul><li><a style="margin-left:0;" class="" href="/react-native/docs/animation.html#content">Animation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appregistry.html#content">AppRegistry</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appstate.html#content">AppState</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/appstateios.html#content">AppStateIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/asyncstorage.html#content">AsyncStorage</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/cameraroll.html#content">CameraRoll</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/layoutanimation.html#content">LayoutAnimation</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/pixelratio.html#content">PixelRatio</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/statusbarios.html#content">StatusBarIOS</a></li><li><a style="margin-left:0;" class="" href="/react-native/docs/stylesheet.html#content">StyleSheet</a></li></ul></div></div><div class="inner-content"><a id="content"></a><h1>Style</h1><div><h2><a class="anchor" name="declaring-styles"></a>Declaring Styles <a class="hash-link" href="#declaring-styles">#</a></h2><p>The way to declare styles in React Native is the following:</p><div class="prism language-javascript"><span class="token keyword">var</span> styles <span class="token operator">=</span> StyleSheet<span class="token punctuation">.</span><span class="token function">create<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
|
base<span class="token punctuation">:</span> <span class="token punctuation">{</span>
|
|
width<span class="token punctuation">:</span> <span class="token number">38</span><span class="token punctuation">,</span>
|
|
height<span class="token punctuation">:</span> <span class="token number">38</span><span class="token punctuation">,</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
|
background<span class="token punctuation">:</span> <span class="token punctuation">{</span>
|
|
backgroundColor<span class="token punctuation">:</span> <span class="token string">'#222222'</span><span class="token punctuation">,</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
|
active<span class="token punctuation">:</span> <span class="token punctuation">{</span>
|
|
borderWidth<span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">,</span>
|
|
borderColor<span class="token punctuation">:</span> <span class="token string">'#00ff00'</span><span class="token punctuation">,</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div><p><code>StyleSheet.create</code> construct is optional but provides some key advantages. It ensures that the values are <strong>immutable</strong> and <strong>opaque</strong> by transforming them into plain numbers that reference an internal table. By putting it at the end of the file, you also ensure that they are only created once for the application and not on every render.</p><h2><a class="anchor" name="using-styles"></a>Using Styles <a class="hash-link" href="#using-styles">#</a></h2><p>All the core components accept a style attribute</p><div class="prism language-javascript"><Text style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>base<span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span>
|
|
<View style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>background<span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span></div><p>and also accepts an array of styles</p><div class="prism language-javascript"><View style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">[</span>style<span class="token punctuation">.</span>base<span class="token punctuation">,</span> style<span class="token punctuation">.</span>background<span class="token punctuation">]</span><span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span></div><p>The behavior is the same as <code>Object.assign</code>: in case of conflicting values, the one from the right-most element will have precedence and falsy values like <code>false</code>, <code>undefined</code> and <code>null</code> will be ignored. A common pattern is to conditionally add a style based on some condition.</p><div class="prism language-javascript"><View style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">[</span>style<span class="token punctuation">.</span>base<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>active && style<span class="token punctuation">.</span>active<span class="token punctuation">]</span><span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span></div><p>Finally, if you really have to, you can also create style objects in render, but they are highly discouraged. Put them last in the array definition.</p><div class="prism language-javascript"><View
|
|
style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">[</span>style<span class="token punctuation">.</span>base<span class="token punctuation">,</span> <span class="token punctuation">{</span>
|
|
width<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>width<span class="token punctuation">,</span>
|
|
height<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>width <span class="token operator">*</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>aspectRatio
|
|
<span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">}</span>
|
|
<span class="token operator">/</span><span class="token operator">></span></div><h2><a class="anchor" name="pass-styles-around"></a>Pass Styles Around <a class="hash-link" href="#pass-styles-around">#</a></h2><p>In order to let a call site customize the style of your component children, you can pass styles around. Use <code>View.stylePropType</code> and <code>Text.stylePropType</code> in order to make sure only styles are being passed.</p><div class="prism language-javascript"><span class="token keyword">var</span> List <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">createClass<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
|
|
propTypes<span class="token punctuation">:</span> <span class="token punctuation">{</span>
|
|
style<span class="token punctuation">:</span> View<span class="token punctuation">.</span>stylePropType<span class="token punctuation">,</span>
|
|
elementStyle<span class="token punctuation">:</span> View<span class="token punctuation">.</span>stylePropType<span class="token punctuation">,</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
|
render<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> <span class="token punctuation">(</span>
|
|
<View style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span>style<span class="token punctuation">}</span><span class="token operator">></span>
|
|
<span class="token punctuation">{</span>elements<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>element<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span>
|
|
<View style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">[</span>styles<span class="token punctuation">.</span>element<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span>elementStyle<span class="token punctuation">]</span><span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span>
|
|
<span class="token punctuation">)</span><span class="token punctuation">}</span>
|
|
<<span class="token operator">/</span>View<span class="token operator">></span>
|
|
<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token comment" spellcheck="true">
|
|
// ... in another file ...
|
|
</span><List style<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>list<span class="token punctuation">}</span> elementStyle<span class="token operator">=</span><span class="token punctuation">{</span>styles<span class="token punctuation">.</span>listElement<span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span></div></div><div class="docs-prevnext"><a class="docs-next" href="timers.html#content">Next →</a></div></div></section><footer class="wrap"><div class="right">© 2015 Facebook Inc.</div></footer></div><div id="fb-root"></div><script>
|
|
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
|
|
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
|
|
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
|
|
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
|
|
ga('create', 'UA-41298772-2', 'facebook.github.io');
|
|
ga('send', 'pageview');
|
|
|
|
!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)
|
|
){js=d.createElement(s);js.id=id;js.src="https://platform.twitter.com/widgets.js";
|
|
fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");
|
|
</script></body></html> |