react-native模仿京东首页

主要参考这位大侠的教程，跟着手写了一把：http://blog.csdn.net/yuanguozhengjust?viewmode=contents

（1）安装环境

（2）命令行cd到项目文件夹下安装插件：

tabBar的插件：npm install i react-native-tab-navigator --save

轮转图片的插件：npm i -d react-native-viewpager --save

（3）开始编码：

index.ios.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 */
'use strict';
import React,{
  AppRegistry,Component,StyleSheet,Text,Image,View
} from 'react-native';

import Header from './Header';
import MainScreen from './MainScreen';
import TabNavigator from 'react-native-tab-navigator';

const HOME = 'home';
const HOME_NORMAL = require('./images/tabs/home_normal.png');
const HOME_FOCUS = require('./images/tabs/home_focus.png');
const CATEGORY = 'category';
const CATEGORY_NORMAL = require('./images/tabs/category_normal.png');
const CATEGORY_FOCUS = require('./images/tabs/category_focus.png');
const FAXIAN = 'faxian';
const FAXIAN_NORMAL = require('./images/tabs/faxian_normal.png');
const FAXIAN_FOCUS = require('./images/tabs/faxian_focus.png');
const CART = 'cart';
const CART_NORMAL = require('./images/tabs/cart_normal.png');
const CART_FOCUS = require('./images/tabs/cart_focus.png');
const PERSONAL = 'personal';
const PERSONAL_NORMAL = require('./images/tabs/personal_normal.png');
const PERSONAL_FOCUS = require('./images/tabs/personal_focus.png');

class react_native_jd extends Component {

  constructor(props) {
    super(props);  
    this.state = {selectedTab: HOME}  
  }

  _renderTabItem(img,selectedImg,tag,childView) {
      return (
          <TabNavigator.Item
              selected={this.state.selectedTab === tag}
              renderIcon={() => <Image style={styles.tabIcon} source={img}/>}
              renderSelectedIcon={() => <Image style={styles.tabIcon} source={selectedImg}/>}
              onPress={() => this.setState({ selectedTab: tag })}>
              {childView}
          </TabNavigator.Item>
      );
  }

  static _createChildView(tag) {
      return (
          <View style={{flex:1,backgroundColor:'#00baff',alignItems:'center',justifyContent:'center'}}>
              <Text style={{fontSize:22}}>{tag}</Text>
          </View>
      )
  }

  render() {
    return (
      <View style={{flex: 1}}>
          <Header />
          <TabNavigator hidesTabTouch={true} tabBarStyle={styles.tab}>
              {this._renderTabItem(HOME_NORMAL,HOME_FOCUS,HOME,<MainScreen/>)}
              {this._renderTabItem(CATEGORY_NORMAL,CATEGORY_FOCUS,CATEGORY,<MainScreen/>)}
              {this._renderTabItem(FAXIAN_NORMAL,FAXIAN_FOCUS,FAXIAN,<MainScreen/>)}
              {this._renderTabItem(CART_NORMAL,CART_FOCUS,CART,<MainScreen/>)}
              {this._renderTabItem(PERSONAL_NORMAL,PERSONAL_FOCUS,PERSONAL,<MainScreen/>)}
          </TabNavigator>
      </View >
    );
  }
}

const styles = StyleSheet.create({
  tab: {
    height: 52,backgroundColor: '#333333',alignItems: 'center'  
  },tabIcon: {
      width: 30,height: 35,resizeMode: 'stretch',marginTop: 12.5
  },});

AppRegistry.registerComponent('react_native_jd',() => react_native_jd);

'use strict';

import React,{
    Component,View,ScrollView,Alert,RefreshControl
} from 'react-native';

import MenuButton from './MenuButton';
import ViewPager from 'react-native-viewpager';

const BANNER_IMGS = [
    require('./images/banner/1.jpg'),require('./images/banner/2.jpg'),require('./images/banner/3.jpg'),require('./images/banner/4.jpg')
];

export default class MainScreen extends Component {

    constructor(props) {
        super(props);
        // 用于构建DataSource对象
        var dataSource = new ViewPager.DataSource({
            pageHasChanged: (p1,p2) => p1 !== p2,});
        // 实际的DataSources存放在state中
        this.state = {
            dataSource: dataSource.cloneWithPages(BANNER_IMGS)
        }
    }

    _renderPage(data,pageID) {
        return (
            <Image source={data} style={styles.page}/>
        );
    }
    
    _onMenuClick(title,tag) {
        Alert.alert('提示','你点击了:' + title + " Tag:" + tag);
    }

    render() {
        return (
            <View>
                <ViewPager
                    style={{height:130}}
                    dataSource={this.state.dataSource}
                    renderPage={this._renderPage}
                    isLoop={true}
                    autoPlay={true}/>
                <View style={styles.menuView}>
                    <MenuButton renderIcon={require('./images/home_icons/wdgz.png')}
                                showText={'我的关注'} tag={'wdgz'}
                                onClick={this._onMenuClick}/>
                    <MenuButton renderIcon={require('./images/home_icons/wlcx.png')}
                                showText={'物流查询'} tag={'wlcx'}
                                onClick={this._onMenuClick}/>
                    <MenuButton renderIcon={require('./images/home_icons/cz.png')}
                                showText={'充值'} tag={'cz'}
                                onClick={this._onMenuClick}/>
                    <MenuButton renderIcon={require('./images/home_icons/dyp.png')}
                                showText={'电影票'} tag={'dyp'}
                                onClick={this._onMenuClick}/>
                </View>
                <View style={styles.menuView}>
                    <MenuButton renderIcon={require('./images/home_icons/yxcz.png')}
                                showText={'游戏充值'} tag={'yxcz'}
                                onClick={this._onMenuClick}/>
                    <MenuButton renderIcon={require('./images/home_icons/xjk.png')}
                                showText={'小金库'} tag={'xjk'}
                                onClick={this._onMenuClick}/>
                    <MenuButton renderIcon={require('./images/home_icons/ljd.png')}
                                showText={'领京豆'} tag={'ljd'}
                                onClick={this._onMenuClick}/>
                    <MenuButton renderIcon={require('./images/home_icons/gd.png')}
                                showText={'更多'} tag={'gd'}
                                onClick={this._onMenuClick}/>
                </View>
                <View style={{marginTop:15,borderWidth:0.5,borderColor:'#ccc'}}/>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        height: 104,flexDirection: 'row',// 水平排布
        paddingLeft: 10,paddingRight: 10,backgroundColor: '#d74140',alignItems: 'center'  // 使元素垂直居中排布,当flexDirection为column时,为水平居中
    },page: {
        flex: 1,height: 130,resizeMode: 'stretch'
    },menuView: {
        flexDirection: 'row',marginTop: 10
    }
});

'use strict';

import React,TouchableWithoutFeedback,PropTypes,StyleSheet
} from 'react-native';

export default class MenuButton extends Component {

    static propTypes = {
        renderIcon: PropTypes.number.isRequired,// 图片,加入.isRequired即为比填项
        showText: PropTypes.string,// 显示标题文字
        tag: PropTypes.string,// Tag
        onClick: PropTypes.func  // 回调函数
    };

    constructor(props) {
        super(props);
        this._onClick = this._onClick.bind(this);  // 需要在回调函数中使用this,必须使用bind(this)来绑定
    }

    _onClick() {
        if (this.props.onClick) {   // 在设置了回调函数的情况下
            this.props.onClick(this.props.showText,this.props.tag);  // 回调Title和Tag
        }
    }

    render() {
        return (
            <TouchableWithoutFeedback onPress={this._onClick}>
                <View style={{alignItems:'center',flex:1}}>
                    <Image style={styles.iconImg} source={this.props.renderIcon}/>
                    <Text style={styles.showText}>{this.props.showText}</Text>
                </View>
            </TouchableWithoutFeedback>
        );
    }
}

const styles = StyleSheet.create({
    iconImg: {
        width: 38,height: 38,marginBottom: 2
    },showText: {
        fontSize: 12
    }
});

'use strict';

import React,TextInput,Platform,StyleSheet
} from 'react-native';

export default class Header extends Component {
    render() {
        return (
            <View style={styles.container}>
                <Image source={require('./images/header/header_logo.png')} style={styles.logo}/>
                <View style={styles.searchBox}>
                    <Image source={require('./images/header/icon_search.png')} style={styles.searchIcon}/>
                    <TextInput
                        keyboardType='web-search'
                        placeholder='搜索京东商品/店铺'
                        style={styles.inputText}/>
                    <Image source={require('./images/header/icon_voice.png')} style={styles.voiceIcon}/>
                </View>
                <Image source={require('./images/header/icon_qr.png')} style={styles.scanIcon}/>
            </View>
        )
    }
}

const styles = StyleSheet.create({
    container: {
        flexDirection: 'row',paddingTop: Platform.OS === 'ios' ? 20 : 0,// 处理iOS状态栏
        height: Platform.OS === 'ios' ? 68 : 48,// 处理iOS状态栏
        backgroundColor: '#d74047',logo: {
        height: 24,width: 64,resizeMode: 'stretch'  // 设置拉伸模式
    },searchBox: {
        height: 30,flex: 1,// 类似于android中的layout_weight,设置为1即自动拉伸填充
        borderRadius: 5,// 设置圆角边
        backgroundColor: 'white',alignItems: 'center',marginLeft: 8,marginRight: 12
    },scanIcon: {
        height: 26.7,width: 26.7,searchIcon: {
        marginLeft: 6,marginRight: 6,width: 16.7,height: 16.7,voiceIcon: {
        marginLeft: 5,marginRight: 8,width: 15,height: 20,inputText: {
        flex: 1,backgroundColor: 'transparent',fontSize: 14
    }
});

index.ios.js是程序入口，MainSceen.js定义首页视图，

Header.js定义头部，MenuButton.js定义首页按钮，Image文件夹用来存放图片。

最终实现效果如下：

详细请参考此博客：http://www.52php.cn/article/p-amqrqgue-bgm.html

有问题欢迎交流。

案例下载地址：

http://download.csdn.net/detail/daleiwang/9434440

这里有位兄台总结了一些react native的学习资源比较全面：

http://blog.csdn.net/bondsui/article/details/49160649

（编辑：李大同）

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