React Native商城项目实战02

1.安装插件，cd到项目根目录下执行:

$ npm i react-native-tab-navigator --save

2.主框架文件Main.js

/**
 * 主页面
 */
import React, { Component } from 'react';
import {
    AppRegistry,
    StyleSheet,
    Text,
    View,
    Image,
    Platform  //判断当前运行的系统
} from 'react-native';

/*=============导入外部组件类==============*/
import TabNavigator from 'react-native-tab-navigator';
var Home = require('../Home/Home');
var Shop = require('../Shop/Shop');
var Mine = require('../Mine/Mine');
var More = require('../More/More');


// ES5
var Main = React.createClass({
    // 初始化函数(变量是可以改变的,充当状态机的角色)
    getInitialState(){
        return{
            selectedTab:'home' // 默认选中的tabBar
        }
    },

    render() {
        return (
            <TabNavigator>
                {/*--首页--*/}
                <TabNavigator.Item
                    title="首页"
                    renderIcon={() => <Image source={{uri:'icon_tabbar_homepage'}} style={styles.iconStyle} />}
                    renderSelectedIcon={() => <Image source={{uri:'icon_tabbar_homepage_selected'}} style={styles.selectedIconStyle} />}
                    badgeText="1"
                    selected={this.state.selectedTab === 'home'}
                    onPress={() => this.setState({ selectedTab: 'home' })}
                >
                    <Home />
                </TabNavigator.Item>
                {/*--商家--*/}
                <TabNavigator.Item
                    title="商家"
                    renderIcon={() => <Image source={{uri:'icon_tabbar_merchant_normal'}} style={styles.iconStyle} />}
                    renderSelectedIcon={() => <Image source={{uri:'icon_tabbar_merchant_selected'}} style={styles.selectedIconStyle} />}
                    badgeText="1"
                    selected={this.state.selectedTab === 'shop'}
                    onPress={() => this.setState({ selectedTab: 'shop' })}
                >
                    <Shop />
                </TabNavigator.Item>
                {/*--我的--*/}
                <TabNavigator.Item
                    title="我的"
                    renderIcon={() => <Image source={{uri:'icon_tabbar_mine'}} style={styles.iconStyle} />}
                    renderSelectedIcon={() => <Image source={{uri:'icon_tabbar_mine_selected'}} style={styles.selectedIconStyle} />}
                    badgeText="1"
                    selected={this.state.selectedTab === 'mine'}
                    onPress={() => this.setState({ selectedTab: 'mine' })}
                >
                    <Mine />
                </TabNavigator.Item>
                {/*--更多--*/}
                <TabNavigator.Item
                    title="更多"
                    renderIcon={() => <Image source={{uri:'icon_tabbar_misc'}} style={styles.iconStyle} />}
                    renderSelectedIcon={() => <Image source={{uri:'icon_tabbar_misc_selected'}} style={styles.selectedIconStyle} />}
                    badgeText="1"
                    onPress={() => this.setState({ selectedTab: 'more' })}
                    selected={this.state.selectedTab === 'more'}
                >
                    <More />
                </TabNavigator.Item>
            </TabNavigator>
        );
    }
});

const styles = StyleSheet.create({
    iconStyle:{
         Platform.OS === 'ios' ? 30 : 25,
        height:Platform.OS === 'ios' ? 30 : 25,
    },
    selectedIconStyle:{
        Platform.OS === 'ios' ? 30 : 25,
        height:Platform.OS === 'ios' ? 30 : 25,
    },
});

// 输出
module.exports = Main;

3.预览效果