我想要做的是在我的应用程序的顶部设置一个名为MainNavigator的切换导航器,该导航器重定向到一个LoadingScreen,用于确定用户是否为Logged或者是否导航到AuthNavigator或AppNavigator。 AuthNavigator本身就是一个stackNavigator,它显示屏幕'LoginScreen'或'SignUpScreen'。 AppNavigator是一个具有多个屏幕的DrawerNavigator(Profile,Home ...)。
我遇到的问题是返回方法似乎有效,因为我可以从“LoginScreen”组件看到我的控制台中的日志,但是在屏幕上,唯一的返回是白屏..当我直接调用我的'LoginScreen'时使用以下内容从LoadingScreen组件中获取组件:
_bootstrapAsync = async () => {
const userToken = await AsyncStorage.getItem('userToken');
// This will switch to the App screen or Auth screen and this loading
// screen will be unmounted and thrown away. switched to develop the app
this.props.navigation.navigate(userToken ? 'App' : 'LoginScreen');
};
我在我的设备上呈现了LoginScreen组件。
我知道问题来自我的AuthNavigator和AppNavigator因为我可以从AuthLoading或MainNavigator返回屏幕组件这里有一些代码:
* Main Navigator: entry point of the app
* Redirect to AuthLoadingScreen by default,
* if user is signed (AsyncStorage) or successly signIn
* redirect to AppNavigator else if user isn't SignIn
* go to AuthNavigator
import { createAppContainer, createSwitchNavigator } from 'react-
navigation';
import AuthNavigator from './auth/AuthNavigator'
import AppNavigator from './app/AppNavigator'
import AuthLoadingScreen from '../screens/auth/AuthLoadingScreen'
export default createAppContainer(createSwitchNavigator(
{
// You could add another route here for authentication.
// Read more at https://reactnavigation.org/docs/en/auth-flow.html
AuthLoading: AuthLoadingScreen,
App: AppNavigator,
Auth: AuthNavigator,
},
{
initialRouteName: 'AuthLoading',
}
));
AuthLoading:
import React from 'react';
import {
ActivityIndicator,
AsyncStorage,
StatusBar,
StyleSheet,
View,
Text
} from 'react-native';
export default class AuthLoadingScreen extends React.Component {
constructor(props) {
super(props);
this._bootstrapAsync();
}
// Fetch the token from storage then navigate to our appropriate place
_bootstrapAsync = async () => {
const userToken = await AsyncStorage.getItem('userToken');
// This will switch to the App screen or Auth screen and this loading
// screen will be unmounted and thrown away. switched to develop the app
this.props.navigation.navigate(userToken ? 'App' : 'Auth');
};
// Render any loading content that you like here
render() {
return (
<View>
<Text>Loading</Text>
<ActivityIndicator />
<StatusBar barStyle="default" />
</View>
);
}
}
AuthNavigator:
import { createStackNavigator } from 'react-navigation';
import LoginScreen from '../../screens/auth/LoginScreen';
import SignUpScreen from '../../screens/auth/SignUpScreen';
export default createStackNavigator({
Login : {
screen : LoginScreen
},
SignUp: {
screen : SignUpScreen
}
},
{
initialRouteName: 'Login',
})
登录界面:
import React, { Component } from 'react';
import { View, Text, StyleSheet } from 'react-native';
export default class LoginScreen extends Component {
render() {
console.log('LOGIN SCREEN')
return (
<View style={styles.container}>
<Text style={styles.text}>Login</Text>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
},
text : {
fontSize: 20,
}
});
我找不到错误,但我知道它来自AuthNavigator和AppNavigator。我可以看到'LOGIN SCREEN'或'APP SCREEN',如果我在我的控制台中设置AuthLoading路线来渲染App但屏幕上没有任何东西,当我在MainNavigator中初始化一个新的路径LoginScreen并从AuthLoading导航到该路线时工作,我有一个漂亮的文字显示在我的屏幕上。
我知道这可能是一个不起眼的错误,但我花了几个小时自己解决这个问题并且找不到,所以如果有人可以帮助我,那就太好了!
谢谢提前!
问题解决了......因为在App.js中我的应用程序的顶部,我包裹了我的MainNavigator
<View>
<StatusBar hidden={true} />
<MainNavigator />
</View>
所以我删除了视图和状态栏...它的工作原理。 4天才搞清楚......我喜欢它! :')