react-native 项目实战 -- 新闻客户端（4） -- 请求网络数据

1.Home.js

/**
 * 首页
 */
import React, { Component } from 'react';
import {
    AppRegistry,
    StyleSheet,
    Text,
    View,
    ListView,
    Image,
    TouchableOpacity,
    Platform
} from 'react-native';

// 导入本地json数据
var LocalData = require('../LocalData.json');

var Home = React.createClass({
    // 不可改变的默认值
    getDefaultProps(){
        return{
            url_api:'http://c.m.163.com/nc/article/headline/T1348647853363/0-20.html',
            key_word:'T1348647853363'
        }
    },

    // 初始化
    getInitialState(){
        return{
            // ListView头部轮播图的数据源
            headerDataArr:[],
            // cell的数据源
            dataSource: new ListView.DataSource({
                rowHasChanged:(r1,r2)=>{r1 !== r2}
            })
        }
    },

    render() {
        return (
            <View style={styles.container}>
                {/*导航条*/}
                {this.renderNavBar()}
                <Text style={styles.welcome}>
                    首页
                </Text>
            </View>
        );
    },

    // 导航条
    renderNavBar(){
        return(
            <View style={styles.navOutViewStyle}>
                <Text style={{color:'white',fontSize:16,fontWeight:'bold'}}>消息</Text>
            </View>
        )
    },

    // 组件加载完毕之后调用
    componentDidMount(){
        // 请求网络数据
        this.loadDataFromNet();
    },

    // 请求网络数据的方法
    loadDataFromNet(){
        fetch(this.props.url_api)
            .then((response)=>response.json())
            .then((responseData)=>{
                // 拿到需要的数据
                var jsonData = responseData[this.props.key_word];

                // 处理数据
                this.dealWithData(jsonData);
            })
            .catch((error)=>{
                if(error){
                   // 网络请求失败,就用本地数据
                    console.log('网络请求失败');
                    var jsonData = LocalData[this.props.key_word];
                    this.dealWithData(jsonData);
                }
            })
    },

    // 处理网络数据的细节方法
    dealWithData(jsonData){
        // 定义临时变量
        var headerArr = [], listDataArr = [];
        // 遍历拿到的json数据
        for (var i=0;i<jsonData.length;i++){
            // 取出单个对象
            var data = jsonData[i];
            if(data.hasAD == 1){
                // 取出广告数据
                headerArr = data.ads;
            }else {
                // 非广告数据(行数据)
                listDataArr.push(data)
            }
        }

        // 更新状态机
        this.setState({
            // ListView头部轮播图的数据源
            headerDataArr:headerArr,
            // cell的数据源
            dataSource:this.state.dataSource.cloneWithRows(listDataArr),
        });

        console.log(headerArr,listDataArr);
    },
});

const styles = StyleSheet.create({
    // 导航条视图
    navOutViewStyle:{
        height:Platform.OS === 'ios' ? 64 : 44,
        backgroundColor:'#468AFF',
        // 主轴方向
        flexDirection:'row',
        // 侧轴对齐方式 垂直居中
        alignItems:'center',
        // 主轴方向居中
        justifyContent:'center',
    },
    container: {
        flex: 1,
        backgroundColor: '#F5FCFF',
    },
    welcome: {
        fontSize: 20,
        textAlign: 'center',
        margin: 10,
    },
});

// 输出类
module.exports = Home;

　

2.分析: 
需要在组件加载完毕之后做网络请求。这个案例中为了演示方便，如果网络请求失败，就加载本地的数据 
LocalData.json:

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      "order": 1,
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