react native底部tab栏切换

1.安装tab栏插件

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

2.引入对应的组件和tab插件

import { Platform, StyleSheet, Text, View,Image } from 'react-native';
import TabNavigator from 'react-native-tab-navigator';

3.复制以下代码到render()函数的return 里

两个图标的地址：

https://raw.githubusercontent.com/knightsj/GitHubPopular-SJ/master/github_client/res/images/ic_polular.png
 
https://raw.githubusercontent.com/knightsj/GitHubPopular-SJ/master/github_client/res/images/ic_trending.png

 <View style={styles.container}>
        <TabNavigator>
          <TabNavigator.Item
            selected={this.state.selectedTab === 'home'}
            title="最热"
            renderIcon={() => <Image style={styles.image} source={require('./res/images/ic_polular.png')} />}
            renderSelectedIcon={() => <Image style={styles.image} source={require('./res/images/ic_polular.png')} />}
            badgeText="1"
            onPress={() => this.setState({ selectedTab: 'home' })}>
            <View style={styles.page1}></View>
          </TabNavigator.Item>
          <TabNavigator.Item
            selected={this.state.selectedTab === 'profile'}
            title="趋势"
            renderIcon={() => <Image style={styles.image} source={require('./res/images/ic_trending.png')} />}
            renderSelectedIcon={() => <Image style={styles.image} source={require('./res/images/ic_trending.png')} />}
            onPress={() => this.setState({ selectedTab: 'profile' })}>
            <View style={styles.page2}></View>
          </TabNavigator.Item>
          <TabNavigator.Item
            selected={this.state.selectedTab === 'test'}
            title="测试"
            renderIcon={() => <Image style={styles.image} source={require('./res/images/ic_trending.png')} />}
            renderSelectedIcon={() => <Image style={styles.image} source={require('./res/images/ic_trending.png')} />}
            onPress={() => this.setState({ selectedTab: 'test' })}>
            <View style={styles.page3}></View>
          </TabNavigator.Item>
        </TabNavigator>
      </View>

4.重新运行 react-native run-android

完整代码：

import React, { Component } from 'react';
import { Platform, StyleSheet, Text, View,Image } from 'react-native';
import TabNavigator from 'react-native-tab-navigator';
const instructions = Platform.select({
  ios: 'Press Cmd+R to reload,\n' + 'Cmd+D or shake for dev menu',
  android:
    'Double tap R on your keyboard to reload,\n' +
    'Shake or press menu button for dev menu',
});
 
export default class App extends Component  {
    constructor(props) {
        super(props);
        this.state = {selectedTab: 'home'};
    }
  render() {
    return (
        <View style={styles.container}>
        <TabNavigator>
          <TabNavigator.Item
            selected={this.state.selectedTab === 'home'}
            title="最热"
            renderIcon={() => <Image style={styles.image} source={require('./res/images/ic_polular.png')} />}
            renderSelectedIcon={() => <Image style={styles.image} source={require('./res/images/ic_polular.png')} />}
            badgeText="1"
            onPress={() => this.setState({ selectedTab: 'home' })}>
            <View style={styles.page1}></View>
          </TabNavigator.Item>
          <TabNavigator.Item
            selected={this.state.selectedTab === 'profile'}
            title="趋势"
            renderIcon={() => <Image style={styles.image} source={require('./res/images/ic_trending.png')} />}
            renderSelectedIcon={() => <Image style={styles.image} source={require('./res/images/ic_trending.png')} />}
            onPress={() => this.setState({ selectedTab: 'profile' })}>
            <View style={styles.page2}></View>
          </TabNavigator.Item>
          <TabNavigator.Item
            selected={this.state.selectedTab === 'test'}
            title="测试"
            renderIcon={() => <Image style={styles.image} source={require('./res/images/ic_trending.png')} />}
            renderSelectedIcon={() => <Image style={styles.image} source={require('./res/images/ic_trending.png')} />}
            onPress={() => this.setState({ selectedTab: 'test' })}>
            <View style={styles.page3}></View>
          </TabNavigator.Item>
        </TabNavigator>
      </View>
 
    );
  }
}
 
const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#F5FCFF',
  },
  page1: {
    flex: 1,
    backgroundColor: 'red'
  },
  page2: {
    flex: 1,
    backgroundColor: 'yellow'
  },
  page3: {
    flex: 1,
    backgroundColor: 'yellowgreen'
  },
//   react native里不用写单位
  image: {
    height: 22,
    width: 22
  }
});

效果：