导航一直是App开发中比较重要的一个组件,ReactNative提供了两种导航组件供我们使用,分别是:NavigatorIOS和Navigator,但是前者只能用于iOS平台,后者在ReactNative0.44版本以后已经被移除了。
好在有人提供了更好的导航组件,就是我们今天要讲的react-navigation,并且ReactNative官方更推荐我们使用此组件。
本篇文章只讲解基础用法,如果你想了解更多,请戳这里->戳我。
简介
react-navigation主要包括导航,底部tab,顶部tab,侧滑等,分别为:
我们今天主要讲TabNavigator。
效果展示
实现代码
import React, { Component } from 'react'; import { AppRegistry, StyleSheet, Button, Text, View, Image, StatusBar } from 'react-native'; import { StackNavigator, TabBarBottom, TabNavigator } from "react-navigation"; class Home extends React.Component { static navigationOptions = { tabBarLabel: '热点', tabBarIcon: ({ focused, tintColor }) => ( <Image source={focused ? require('../res/images/hot_hover.png') : require('../res/images/hot.png')} style={{ width: 26, height: 26, tintColor: tintColor }} /> ) }; render() { return ( <View style={styles.container}> <Text>!这是热点</Text> </View> ); } } class Circle extends React.Component { static navigationOptions = { tabBarLabel: '圈子', tabBarIcon: ({ focused, tintColor }) => ( <Image source={focused ? require('../res/images/coterie.png') : require('../res/images/coterie.png')} style={{ width: 26, height: 26, tintColor: tintColor }} /> ) }; render() { return ( <View style={styles.container}> <Text>!这是圈子</Text> </View> ); } } class Tools extends React.Component { static navigationOptions = { tabBarLabel: '工具', tabBarIcon: ({ focused, tintColor }) => ( <Image source={focused ? require('../res/images/tool.png') : require('../res/images/tool.png')} style={{ width: 26, height: 26, tintColor: tintColor }} /> ) }; render() { return ( <View style={styles.container}> <Text>!这是工具</Text> </View> ); } } class Mypage extends React.Component { static navigationOptions = { tabBarLabel: '我的', tabBarIcon: ({ focused, tintColor }) => ( <Image source={focused ? require('../res/images/my_hover.png') : require('../res/images/my.png')} style={{ width: 26, height: 26, tintColor: tintColor }} /> ) }; render() { return ( <View style={styles.container}> <Text>!这是我的</Text> </View> ); } } const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#fff', } }); const MyApp = TabNavigator( { Home: { screen: Home, }, Circle: { screen: Circle, }, Tools: { screen: Tools, }, Mypage: { screen: Mypage, }, }, { tabBarOptions: { activeTintColor: '#4BC1D2', inactiveTintColor: '#000', showIcon: true, showLabel: true, upperCaseLabel: false, pressColor: '#823453', pressOpacity: 0.8, style: { backgroundColor: '#fff', paddingBottom: 0, borderTopWidth: 0.5, borderTopColor: '#ccc', }, labelStyle: { fontSize: 12, margin: 1 }, indicatorStyle: { height: 0 }, //android 中TabBar下面会显示一条线,高度设为 0 后就不显示线了 }, tabBarPosition: 'bottom', swipeEnabled: false, animationEnabled: false, lazy: true, backBehavior: 'none', }); module.exports = MyApp;
配置说明
NavigationOptions
当然,通过NavigationOptions来配置我们的tabBarItem:
TabNavigatorConfig
tabBarOptions for (iOS上的默认标签栏)TabBarBottom
tabBarOptions for (Android上的默认标签栏)TabBarTop
小技巧
1.去掉安卓下的下划线,设置:tabBarOptions => indicatorStyle:{ height: 0 };
2.底部导航在导航最上方添加一条分割线,设置:tabBarOptions => style => borderTopWidth: 0.5, borderTopColor: '#ccc';
3.导航安卓图标和文字间隙比较大,手动调整小设置:tabBarOptions => labelStyle => margin: 0;