ReactNative: 使用标签栏组件TabBarIOS组件

<TabBarIOS> //标签栏
      <TabBarIOS.Item>  //页面1的tab item 
          <View></View> //页面1
      </TabBarIOS.Item>

      <TabBarIOS.Item>  //页面2的tab item 
          <View></View> //页面2
      </TabBarIOS.Item>

      <TabBarIOS.Item>  //页面3的tab item
          <View></View> //页面3 
      </TabBarIOS.Item>

      <TabBarIOS.Item>  //页面4的tab item
          <View></View> //页面4 
      </TabBarIOS.Item>
</TabBarIOS>    

//Tab栏的背景颜色
barTintColor

//Tab未选中的标签背景颜色
unselectedTintColor

//Tab选中的标签背景颜色
tintColor

//Tab未选中的item背景色
unselectedItemTintColor

//Tab栏是否半透明
translucent

//Tab的每一个item的位置
itemPositioning

//红色的提醒数字或者文字，一般用作消息提示
badge

//提示数字或者文字的背景色
badgeColor

//Tab的自定义图标，如果不指定，默认显示系统图标systemIcon
icon

//点击事件，当某一个tab被选中时，需要改变该组件的selected={true}设置
onPress

//是否选中某一个tab，如果其值为true，则选中并显示子组件
selected

//选中状态的自定义图标，如果为空，默认会把图标变成蓝色
selectedIcon

//系统图标，会覆盖自定义图标和标题，其值为枚举类型，可选值包括：bookmarks、contacts、downloads、favorites、featured、history、more、most-recent、most-viewed、recents、search和top-rated
systemIcon

//是否采用原始图颜色渲染
renderAsOriginal

//标题，它会出现在图标底部。当我们使用了系统图标时，将会忽略该标题
title

import React, { Component } from ‘react‘;
import {
    StyleSheet,
    View,
    TabBarIOS
} from ‘react-native‘;

export default class TabBar extends Component{

    constructor(props){
        super(props);
        this.state = {tabItemIndex:0}
    }

    render(){
        const {tabItemIndex} = this.state;
        return (
            <View style={styles.flex}>
                <TabBarIOS style={styles.size} tintColor={‘black‘} translucent={true}>
                    <TabBarIOS.Item
                        title={"首页"}
                        icon={{uri:"tab_home",scale:2}}
                        selectedIcon={{uri:"tab_home_click",scale:2}}
                        renderAsOriginal={true}
                        onPress={()=>{this.setState({tabItemIndex:0})}}
                        selected={tabItemIndex === 0}>
                        <View style={[styles.flex,styles.tab1]}/>
                    </TabBarIOS.Item>
                    <TabBarIOS.Item
                        title={"消息"}
                        icon={{uri:"tab_information",scale:2}}
                        selectedIcon={{uri:"tab_information_click",scale:2}}
                        renderAsOriginal={true}
                        onPress={()=>{this.setState({tabItemIndex:1})}}
                        selected={tabItemIndex === 1}>
                        <View style={[styles.flex,styles.tab2]}/>
                    </TabBarIOS.Item>
                    <TabBarIOS.Item
                        title={"我的"}
                        icon={{uri:"tab_mine",scale:2}}
                        selectedIcon={{uri:"tab_mine_click",scale:2}}
                        renderAsOriginal={true}
                        onPress={()=>{this.setState({tabItemIndex:2})}}
                        selected={tabItemIndex === 2}>
                        <View style={[styles.flex,styles.tab3]}/>
                    </TabBarIOS.Item>
                </TabBarIOS>
            </View>
        )
    }
}

const styles = StyleSheet.create({
    flex: {
        flex: 1,
    },
    size: {
        height: 49,
    },
    tab1: {
        marginBottom: 49,
        backgroundColor: ‘red‘
    },
    tab2: {
        marginBottom: 49,
        backgroundColor: ‘green‘
    },
    tab3: {
        marginBottom: 49,
        backgroundColor: ‘brown‘
    }
});

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 */

import React, { Component } from ‘react‘;
import TabBar from ‘./src/TabBar‘

import {
    AppRegistry,
    StyleSheet,
    View
} from ‘react-native‘;


export default class ReactNativeDemo extends Component {

    render() {
        return (
            <View style={styles.flex}>
                <TabBar/>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    flex: {
        flex: 1
    }
});

AppRegistry.registerComponent(‘ReactNativeDemo‘, () => ReactNativeDemo);