import {StackNavigator,TabNavigator,TabBarBottom} from 'react-navigation'; import HomeScreen from './pages/HomePage'; import MineScreen from './pages/MinePage';
React Native react-navigation 导航使用详解(4)
(3)定义TabNavigator:
const Tab = TabNavigator( { Home:{ screen:HomeScreen, navigationOptions:({navigation}) => ({ tabBarLabel:'首页', tabBarIcon:({focused,tintColor}) => ( <TabBarItem tintColor={tintColor} focused={focused} normalImage={require('./imgs/nav_fav@2x.png')} selectedImage={require('./imgs/nav_fav_actived@3x.png')} /> ) }), }, Mine:{ screen:MineScreen, navigationOptions:({navigation}) => ({ tabBarLabel:'我', tabBarIcon:({focused,tintColor}) => ( <TabBarItem tintColor={tintColor} focused={focused} normalImage={require('./imgs/tab_me_nor@3x.png')} selectedImage={require('./imgs/tab_me_selected@2x.png')} /> ) }), }, }, { tabBarComponent:TabBarBottom, tabBarPosition:'bottom', swipeEnabled:false, animationEnabled:false, lazy:true, tabBarOptions:{ activeTintColor:'#06c1ae', inactiveTintColor:'#979797', style:{backgroundColor:'#ffffff',}, labelStyle: { fontSize: 20, // 文字大小 }, } } );
TabBarItem为封装的组件:
import React,{Component} from 'react'; import {Image} from 'react-native'; export default class TabBarItem extends Component { render() { return( <Image source={ this.props.focused ? this.props.selectedImage : this.props.normalImage } style={ { tintColor:this.props.tintColor,width:25,height:25 } } /> ) } }
可以看到,我们定义了一个名称为【Tab】的TabNavigator的导航组件。在组件中,分为两层参数:
(1)第一层参数定义了要切换的界面,即【首页】、【我】两个界面组件,通过screen属性指定。并且通过navigationOptions属性设置相关属性参数。
(2)设置导航栏的属性参数。
TabNavigator定义好之后,需要用StackNavigator,顾名思义,StackNavigator就是以栈的方式来存放整个界面的,而
TabNavigator是作为一个界面内不同子界面之间切换。所以还需要我们定义StackNavigator:
const Navigator = StackNavigator( { Tab:{screen:Tab}, Product:{screen:ProductScreen} }, { navigationOptions:{ headerBackTitle:null, headerTintColor:'#333333', showIcon:true, swipeEnabled:false, animationEnabled:false, }, mode:'card', });
看起来和TabNavigator很相似,同样是指定了两个参数:
(1)指定要跳转的界面组件。同样是screen属性标识界面组件,不多赘述。