mirror of
https://github.com/wu736139669/vczero.github.io.git
synced 2026-08-05 06:23:38 +00:00
413 lines
11 KiB
HTML
413 lines
11 KiB
HTML
<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<style>
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h1,
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h2,
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h3,
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h4,
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h5,
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h6,
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p,
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blockquote {
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margin: 0;
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padding: 0;
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}
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body {
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font-family: "Helvetica Neue", Helvetica, "Hiragino Sans GB", Arial, sans-serif;
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font-size: 13px;
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line-height: 18px;
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color: #737373;
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background-color: white;
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margin: 10px 13px 10px 13px;
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}
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table {
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margin: 10px 0 15px 0;
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border-collapse: collapse;
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}
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td,th {
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border: 1px solid #ddd;
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padding: 3px 10px;
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}
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th {
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padding: 5px 10px;
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}
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a {
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color: #0069d6;
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}
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a:hover {
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color: #0050a3;
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text-decoration: none;
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}
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a img {
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border: none;
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}
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p {
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margin-bottom: 9px;
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}
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h1,
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h2,
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h3,
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h4,
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h5,
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h6 {
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color: #404040;
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line-height: 36px;
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}
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h1 {
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margin-bottom: 18px;
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font-size: 30px;
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}
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h2 {
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font-size: 24px;
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}
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h3 {
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font-size: 18px;
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}
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h4 {
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font-size: 16px;
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}
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h5 {
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font-size: 14px;
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}
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h6 {
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font-size: 13px;
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}
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hr {
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margin: 0 0 19px;
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border: 0;
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border-bottom: 1px solid #ccc;
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}
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blockquote {
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padding: 13px 13px 21px 15px;
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margin-bottom: 18px;
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font-family:georgia,serif;
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font-style: italic;
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}
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blockquote:before {
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content:"\201C";
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font-size:40px;
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margin-left:-10px;
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font-family:georgia,serif;
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color:#eee;
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}
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blockquote p {
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font-size: 14px;
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font-weight: 300;
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line-height: 18px;
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margin-bottom: 0;
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font-style: italic;
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}
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code, pre {
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font-family: Monaco, Andale Mono, Courier New, monospace;
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}
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code {
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background-color: #fee9cc;
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color: rgba(0, 0, 0, 0.75);
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padding: 1px 3px;
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font-size: 12px;
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-webkit-border-radius: 3px;
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-moz-border-radius: 3px;
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border-radius: 3px;
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}
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pre {
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display: block;
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padding: 14px;
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margin: 0 0 18px;
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line-height: 16px;
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font-size: 11px;
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border: 1px solid #d9d9d9;
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white-space: pre-wrap;
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word-wrap: break-word;
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}
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pre code {
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background-color: #fff;
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color:#737373;
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font-size: 11px;
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padding: 0;
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}
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sup {
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font-size: 0.83em;
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vertical-align: super;
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line-height: 0;
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}
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* {
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-webkit-print-color-adjust: exact;
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}
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@media screen and (min-width: 914px) {
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body {
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width: 854px;
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margin:10px auto;
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}
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}
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@media print {
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body,code,pre code,h1,h2,h3,h4,h5,h6 {
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color: black;
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}
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table, pre {
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page-break-inside: avoid;
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}
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}
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</style>
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<title>React-Native入门指南</title>
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</head>
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<body>
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<h1>React-Native入门指南</h1>
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<h2>第四篇React-Native布局实战(二)</h2>
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<pre><code>在不断深入的过程中,发现React-Native布局和样式的坑还有很多,他没有像浏览器那样灵活和有规律可循,其中的规律需要我自己踩坑的时候发现。比如:不存在zIndex,后面的元素覆盖前面的元素;内层元素覆盖外层元素等等,borderRadius的设置,需要考虑到内层元素的位置等等。
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</code></pre>
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<h3>一、实战的内容</h3>
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<pre><code>这里选用携程的App首页作为栗子,随不是严格的9宫格(比9宫格稍微难点...),但是可以很好的让我们练习flexbox.最后需要完成的结果如下:
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</code></pre>
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<p><img src="pic/4_0_1.png" alt="'首页'" /></p>
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<h3>二、分解内容</h3>
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<pre><code>整个页面我们可以分为几个部分,大致如下:
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</code></pre>
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<ul>
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<li>头部</li>
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<li>图片轮播</li>
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<li>9宫格</li>
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<li>底部活动</li>
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</ul>
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<h3>三、头部导航栏</h3>
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<pre><code>因为,组件还没有讲,这里只是做一个简单的介绍。在React-Native中实现头部导航栏很简单,只要使用NavigatorIOS组件即可。现在开工。
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1、我们在index.ios.js中添加如下代码;同时创建文件夹pagaes和pages下创建Index.js
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var React = require('react-native');
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var Index = require('./pages/Index');
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var {
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NavigatorIOS,
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AppRegistry,
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StyleSheet,
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} = React;
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var NV = React.createClass({
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render: function(){
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return(
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<NavigatorIOS
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style={styles.container}
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initialRoute={{
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title: '首页',
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component: Index,
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}}
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/>
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);
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}
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});
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var styles = StyleSheet.create({
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container: {
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flex: 1,
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}
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});
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AppRegistry.registerComponent('HelloWorld', () => NV);
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分析代码:
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(1)require:引入外部模块,就像,引入我们自己创建的/pages/Index.js一样。
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(2)引入定义NavigatorIOS、AppRegistry、StyleSheet组件和类。
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(3)在render中调用NavigatorIOS组件,initialRoute是初始化路由,title是当前页面的头部标题;component是当前路由下显示的组件;
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(4)注意:这里NavigatorIOS的style需要设置大小,比如这里设置是flex:1,否则就不能显示内容主体;
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(5)最后我们需要注册当前应用:AppRegistry.registerComponent('HelloWorld', () => NV);
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2、创建Index.js文件,文件的内容如下, module.exports就暴露了Index模块。
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</code></pre>
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<p><img src="pic/4_0_3.png" alt="'Index'" />
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效果如下图:
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<img src="pic/4_0_2.png" alt="'头部'" /></p>
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<h3>四、图片轮播</h3>
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<pre><code>这里图片轮播使用的是第三方组件react-native-swiper,当然React-Native是支持transform可以直接实现一套。我们启动npm命令行,在项目的根目录使用如下命令安装模块。
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$ npm react-native-swiper --save
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安装完成后,我们需要完成轮播功能。因为可以到github看看swiper暴露的接口和参数。github地址是:https://github.com/leecade/react-native-swiper
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(1)引入swiper,前面也提到了require.
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var Swiper = require('react-native-swiper');
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(2)使用swiper,将轮播图封装成单独的组件
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var sliderImgs = [
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'http://images3.c-ctrip.com/SBU/apph5/201505/16/app_home_ad16_640_128.png',
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'http://images3.c-ctrip.com/rk/apph5/C1/201505/app_home_ad49_640_128.png',
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'http://images3.c-ctrip.com/rk/apph5/D1/201506/app_home_ad05_640_128.jpg'
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];
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var Slider = React.createClass({
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render: function(){
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return (
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<Swiper style={styles.wrapper} showsButtons={false} autoplay={true} height={150} showsPagination={false}>
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<Image style={[styles.slide,]} source={{uri: sliderImgs[0]}}></Image>
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<Image style={[styles.slide,]} source={{uri: sliderImgs[1]}}></Image>
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<Image style={[styles.slide,]} source={{uri: sliderImgs[2]}}></Image>
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</Swiper>
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);
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}
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});
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(3)这样我们可以直接在render的时候直接用:<Slider/>
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</code></pre>
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<h3>五、完成第一个9宫格布局,后面复制拷贝</h3>
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<pre><code>其实4个九宫格都是一样,这个其实可以封装成组件,这里采用拷贝的形式,开发一个,其他3个就ok的,不会偷懒的工程师,不是好工程师[偷笑]。分析下布局:
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(1)其实首先是3个列在一行的布局,那么外层组件是需要flexDirection: 'row',各占据宽度的1/3,即各自flex:1;
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(2)每个列内又分两行, 需要每个行都是flex:1,各占据高度的一半;
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(3)第一列是文字图片组合,其余都是文字组合;
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(4)所有行内元素都是水平、垂直居中;
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(5)这里使用了个TouchableHighlight组件,是为了出发onPress事件,类似于click或者touch事件。
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<View style={[styles.sbu_red, styles.sbu_view]}>
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<TouchableHighlight underlayColor={'#FA6778'} style={{flex:1}}>
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<View style={[styles.sbu_flex, styles.sbu_borderRight]}>
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<View style={[styles.sub_con_flex, styles.sub_text]}>
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<Text style={[styles.font16]}>酒店</Text>
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</View>
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<View style={[styles.sub_con_flex]}>
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<Image style={[styles.sbu_icon_img]} source={{uri:BUIcon[0]}}></Image>
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</View>
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</View>
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</TouchableHighlight>
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<View style={[styles.sbu_flex, styles.sbu_borderRight]}>
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<View style={[styles.sub_con_flex, styles.sub_text, styles.sbu_borderBottom]}>
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<Text style={[styles.font16]}>海外</Text>
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</View>
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<View style={[styles.sub_con_flex, styles.sub_text]}>
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<Text style={[styles.font16]}>周边</Text>
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</View>
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</View>
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<View style={[styles.sbu_flex]}>
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<View style={[styles.sub_con_flex, styles.sub_text, styles.sbu_borderBottom]}>
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<Text style={[styles.font16]}>团购.特惠</Text>
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</View>
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<View style={[styles.sub_con_flex, styles.sub_text]}>
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<Text style={[styles.font16]}>客栈.公寓</Text>
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</View>
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</View>
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</View>
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</code></pre>
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<h3>六、样式类</h3>
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<pre><code>说完了布局的原理,这里需要贴上样式仅供参考:
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var styles = StyleSheet.create({
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//container
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container:{
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backgroundColor:'#F2F2F2',
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flex:1,
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},
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//slider
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wrapper: {
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height:80,
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},
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slide: {
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height:80,
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resizeMode: Image.resizeMode.contain,
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},
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//sbu
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sbu_view:{
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height:84,
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marginLeft: 5,
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marginRight:5,
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borderWidth:1,
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borderRadius:5,
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marginBottom:10,
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flexDirection:'row',
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},
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sbu_red:{
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backgroundColor: '#FA6778',
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borderColor:'#FA6778',
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marginTop:-70,
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},
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sbu_blue:{
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backgroundColor: '#3D98FF',
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borderColor:'#3D98FF',
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},
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sbu_green:{
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backgroundColor: '#5EBE00',
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borderColor:'#5EBE00',
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},
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sbu_yellow:{
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backgroundColor: '#FC9720',
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borderColor:'#FC9720',
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},
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sbu_flex:{
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flex:1,
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},
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sbu_borderRight:{
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borderColor:'#fff',
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borderRightWidth: 0.5,
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},
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sbu_icon_img:{
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height:40,
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width:40,
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resizeMode:Image.resizeMode.contain,
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},
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sub_con_flex:{
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flex:1,
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justifyContent: 'center',
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alignItems: 'center',
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},
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sub_text:{
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justifyContent:'center',
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},
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font16:{
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fontSize:17,
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color:'#FFF',
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fontWeight:'900',
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},
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sbu_borderBottom:{
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borderBottomWidth:0.5,
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borderBottomColor:'#fff',
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},
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img_view:{
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height:62,
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marginLeft:5,
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marginRight:5,
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flexDirection: 'row',
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marginBottom:20,
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backgroundColor:'#fff',
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},
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img_flex:{
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flex:1,
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borderWidth:1,
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borderColor:'#ccc',
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},
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img_wh: {
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height:59,
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borderRightWidth:0,
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resizeMode:Image.resizeMode.contain,
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}
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});
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着重说下resizeMode:Image.resizeMode.contain。在React-Native中图片的大小是不会根据给定一个宽度或者高度而自适应大小的,因此我们需要让图片根据宽度或者高度来自适应,那么可以使用resizeMode:Image.resizeMode.contain。facebook提示错误信息的样式表中也没有提及,文档中也没有提及。所以后续还有不少的坑需要大家去一起探索。
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</code></pre>
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<h3>七、Index.js整个代码,仅供参考</h3>
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<pre><code>实例代码中会涉及ScrollView组件,主要是为了适应小屏的机器,可以滚动视图。
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</code></pre>
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<p><a href="https://github.com/vczero/react-native-lession/tree/master/code/%E7%AC%AC4%E7%AF%87%E5%B8%83%E5%B1%80%E5%AE%9E%E6%88%98%EF%BC%88%E4%BA%8C%EF%BC%89%E4%BB%A3%E7%A0%81">代码链接:github</a></p>
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</body>
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</html> |