React-Navigation
前端架构
准备
/*安装组件*/
npm install --save react-navigation
npm install --save react-native-gesture-handler
/*添加依赖*/
react-native link react-native-gesture-handler
tips
如果是通过react-cli 脚手架打包的工程可能出现安装时缺少依赖，我的根据官网上教程指导，就出现这个问题。
问题：
bogon:AwesomeProject fandong$ npm install -g react-navigation
npm WARN [email protected] requires a peer of react@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react-native@* but none is installed. You must install peer dependencies yourself.
npm WARN @react-navigation/[email protected] requires a peer of react@* but none is installed. You must install peer dependencies yourself.
npm WARN @react-navigation/[email protected] requires a peer of react-native@* but none is installed. You must install peer dependencies yourself.
npm WARN @react-navigation/[email protected] requires a peer of react-native-gesture-handler@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react-native@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react-native@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react-native-gesture-handler@^1.0.12 but none is installed. You must install peer dependencies yourself.
npm WARN @react-navigation/[email protected] requires a peer of react@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react-native@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react-native-gesture-handler@^1.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react-native@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react-native@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react@* but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react-native@* but none is installed. You must install peer dependencies yourself.
提示缺少： react@*
react-native@*
react-native-gesture-handler@*
这可能是由于版本3.X导致的，官网也有相应的提示。
如：Since [email protected] depends on the new React.createContext API, which is added in [email protected], we will require react-native@^0.54.x. Also, [email protected] needs react-native-gesture-handler to work, you will need to make sure that the version of react-native-gesture-handler you are using matches your current react-native version.
根据提示 npm install --save react@* ,等等即可。导航API
basic: 顶部导航条
1> createStackNavigator
uage:
createStackNavigator({
Home: {
screen: HomeScreen
}
)
参数： Home: 自定义对象，
screen: 显示的对象，这里我定义了的一个HomeScreen
HomeScreen组件
import React, { Component } from 'react';
import {View, Text,Button, Alert} from 'react-native';
import styles from '../basic/style';
class HomeScreen extends Component {
static navigationOptions={
headerTitle:<Text>'uuu'</Text>,
headerRight:(
<Button
onPress={()=>Alert.alert("hehe")}
title="Info"
color="blue"
/>
)
};
componentWillMount(){
//Alert.alert("Will Mount... Home");
}
componentWillUnmount(){
//Alert.alert("Unmount Home");
}
render() {
return (
<View style={styles.container}>
<Text>Home Screen</Text>
<Button
title="touch me"
onPress={()=>this.props.navigation.navigate('Details',{
id:'home1',
other:'done'
})}
>
</Button>
<Button
title="touch me"
onPress={()=>this.props.navigation.navigate('ModalScreen',{
id:'home1',
other:'done'
})}
>
</Button>
</View>
);
}
}
export default HomeScreen;导航函数
在React Native 开发中，每个组件props 会引入navigation 这个组件对象，常用的函数有;
navigate(<componentName>,{params/*option*/})
push(<componentName>,{params/*option*/})
区别： 这个函数使用都能通过this.props.navigation.navigate('Details') 到对应的界面。如果当前的界面就是Details 时，使用navigate 不在出现切换界面的效果，即不会导航。
push不同，push会把这个Details 继续入栈，想下web 中，访问的网页历史记录。传参、添加参数、去参数
navigate(<componentName>,{params/*option*/})
push(<componentName>,{params/*option*/})
第二参数即。
添加参数 setParam(key,value)
去参数： getParam(key,defaultValue)
第二个有个默认值需要注意下。
导航模式
默然是左右切换加载 ，第二种为 modal 即上下加载。
const AppNavigator = createStackNavigator({
Home:{
screen: HomeScreen,
navigationOptions: () => ({
title: '首页'
})
},
Details:{
screen:DetailScreen,
navigationOptions:({navigation})=>{
return {title: navigation.getParam("id","no-id")};
}
},
ModalScreen:{
screen:ModalScreen,
navigationOptions:()=>({
title:'Modal'
})
}
},{
initialRouteName:"Home",
mode:'modal',
//headerMode:'none'
});
const AppContainer=createAppContainer(AppNavigator);
导航的生命周期
组件跳转当前界面A，表示A 入栈，会触发 组件的生命周期即 componentWillMount 事件触发，如果从A 切换到B，不会触发A 的componentWillUnMount 事件，B的componentWillMount 触发，但是B 切换到A时，B会触发componentWillUnMount。应为A并没有出栈。
导航的样式调整
/*自定义导航头*/
static navigationOptions = {
headerTitle: <LogoTitle />,
headerRight: (
<Button
onPress={() => alert('This is a button!')}
title="Info"
color="#fff"
/>
),
};其他导航API
createBottomTabNavigator
：同第一个
createDrawerNavigator
usage：
static navigationOptions = {
drawerLabel: 'Home',
drawerIcon: ({ tintColor }) => (
<Image
source={require('./chats-icon.png')}
style={[styles.icon, {tintColor: tintColor}]}
/>
),
};
createSwitchNavigator
usage:
const AppStack = createStackNavigator({ Home: HomeScreen, Other: OtherScreen });
const AuthStack = createStackNavigator({ SignIn: SignInScreen });
export default createAppContainer(createSwitchNavigator(
{
AuthLoading: AuthLoadingScreen,
App: AppStack,
Auth: AuthStack,
},
{
initialRouteName: 'AuthLoading',
}
));
--
AuthLoadingScreen 中调用：this.props.navigation.navigate(userToken ? 'App' : 'Auth');