react-native学习（一）————使用react-native-tab-navigator创建底部导航

使用react-native-tab-navigator创建底部Tab导航

1.使用npm安装react-native-tab-navigator

   npm install react-native-tab-navigator --save 

2.页面引入

   import TabNavigator from 'react-native-tab-navigator

3.完整代码

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



type Props = {};
export default class App extends Component<Props> {
    constructor(props){
        super(props);
        this.state = {
          selectedTab: 'tb_popular',      // 默认选择第一个
        }

    }
  render() {
    return (
        
        //selected：所选tab项指代名称
        //selectedTitleStyle：设置选中颜色
        //title： tab项展示名称
        //renderIcon：默认icon
        //renderSelectedIcon ：选中icon
        //badgeText：徽标数
        <TabNavigator>
          <TabNavigator.Item
            selected = {this.state.selectedTab == 'tb_popular'}
            selectedTitleStyle = {{ color: 'red'}}
            title = '最热'
            renderIcon = { () => <Image style={styles.image} source={require('./res/images/ic_polular.png')} /> }
            renderSelectedIcon = { () => <Image style={[styles.image,{tintColor:'red'}]} source = {require('./res/images/ic_polular.png')} />}
            badgeText = '1'
            onPress = {() => this.setState({ selectedTab: 'tb_popular'})}>
              <View style = {styles.page}></View>
          </TabNavigator.Item>
          <TabNavigator.Item
            selected = { this.state.selectedTab == 'tb_trending'}
            selectedTitleStyle = {{ color: 'red'}}
            title = "趋势"
            renderIcon = { () => <Image style={styles.image} source={ require('./res/images/ic_trending.png')}/>}
            renderSelectedIcon = { () => <Image style={[styles.image,{tintColor:'red'}]} source = {require('./res/images/ic_trending.png')} />}
            onPress = { () => this.setState({ selectedTab: 'tb_trending'})}>
              <View style = {styles.page1}></View>
          </TabNavigator.Item>
            <TabNavigator.Item
                selected = {this.state.selectedTab == 'tb_favorite'}
                selectedTitleStyle = {{ color: 'red'}}
                title = '收藏'
                renderIcon = { () => <Image style={styles.image} source={require('./res/images/ic_polular.png')} /> }
                renderSelectedIcon = { () => <Image style={[styles.image,{tintColor:'red'}]} source = {require('./res/images/ic_polular.png')} />}
                badgeText = '1'
                onPress = {() => this.setState({ selectedTab: 'tb_favorite'})}>
                <View style = {styles.page}></View>
            </TabNavigator.Item>
            <TabNavigator.Item
                selected = { this.state.selectedTab == 'tb_my'}
                selectedTitleStyle = {{ color: 'red'}}
                title = "我的"
                renderIcon = { () => <Image style={styles.image} source={ require('./res/images/ic_trending.png')}/>}
                renderSelectedIcon = { () => <Image style={[styles.image,{tintColor:'red'}]} source = {require('./res/images/ic_trending.png')} />}
                onPress = { () => this.setState({ selectedTab: 'tb_my'})}>
                <View style = {styles.page1}></View>
            </TabNavigator.Item>
        </TabNavigator>
    );
  }
}

const styles = StyleSheet.create({
    page:{
      flex:1,
      backgroundColor:'red',
    },
    page1:{
      flex:1,
      backgroundColor:'yellow'
    },
    image:{
      height:22,
      width:22
    }
});

4.执行结果