只有新用户才能使用的显示屏反应导航v3

时间:2018-12-29 01:15:39

标签: android ios reactjs react-native react-navigation

我想知道如何使用React Navigation v3实现欢迎/入门屏幕。

我的困惑是如何进入欢迎/入门屏幕?
屏幕应该在Appstack还是Authstack中?

我只想向新用户显示。当用户注销并重新进行身份验证时,我希望将其从堆栈中弹出,因为他们不是新用户,而是直接将他们带到主应用程序。

我认为这条逻辑应该在Authloading屏幕中进行,只是不确定如何使用或使用哪种技术。

这是来自https://snack.expo.io/@react-navigation/auth-flow-v3

的示例App

谢谢您的任何帮助。

import React from 'react';
import {
  ActivityIndicator,
  AsyncStorage,
  Button,
  StatusBar,
  StyleSheet,
  View,
} from 'react-native';
import { createStackNavigator, createSwitchNavigator, createAppContainer } from 'react-navigation';

class SignInScreen extends React.Component {
  static navigationOptions = {
    title: 'Please sign in',
  };

  render() {
    return (
      <View style={styles.container}>
        <Button title="Sign in!" onPress={this._signInAsync} />
      </View>
    );
  }

  _signInAsync = async () => {
    await AsyncStorage.setItem('userToken', 'abc');
    this.props.navigation.navigate('App');
  };
}

class HomeScreen extends React.Component {
  static navigationOptions = {
    title: 'Welcome to the app!',
  };

  render() {
    return (
      <View style={styles.container}>
        <Button title="Show me more of the app" onPress={this._showMoreApp} />
        <Button title="Actually, sign me out :)" onPress={this._signOutAsync} />
      </View>
    );
  }

  _showMoreApp = () => {
    this.props.navigation.navigate('Other');
  };

  _signOutAsync = async () => {
    await AsyncStorage.clear();
    this.props.navigation.navigate('Auth');
  };
}

class OtherScreen extends React.Component {
  static navigationOptions = {
    title: 'Lots of features here',
  };

  render() {
    return (
      <View style={styles.container}>
        <Button title="I'm done, sign me out" onPress={this._signOutAsync} />
        <StatusBar barStyle="default" />
      </View>
    );
  }

  _signOutAsync = async () => {
    await AsyncStorage.clear();
    this.props.navigation.navigate('Auth');
  };
}

class AuthLoadingScreen extends React.Component {
  constructor() {
    super();
    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.
    this.props.navigation.navigate(userToken ? 'App' : 'Auth');
  };

  // Render any loading content that you like here
  render() {
    return (
      <View style={styles.container}>
        <ActivityIndicator />
        <StatusBar barStyle="default" />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
});

const AppStack = createStackNavigator({ Home: HomeScreen, Other: OtherScreen });
const AuthStack = createStackNavigator({ SignIn: SignInScreen });

export default createAppContainer(createSwitchNavigator(
  {
    AuthLoading: AuthLoadingScreen,
    App: AppStack,
    Auth: AuthStack,
  },
  {
    initialRouteName: 'AuthLoading',
  }
));

1 个答案:

答案 0 :(得分:2)

我将其放在AppStack中,因为它是您应用程序内容的一部分,而不是您的身份验证流程的一部分。

此外,您需要一种方法来确定它是新用户还是老用户。因此,您可以存储此信息服务器端,也可以使用AsyncStorage在本地存储。最好的方法是存储此信息服务器端,因为用户总是可以得到一部新手机。因此,在加载(如果经过身份验证)或身份验证期间,请确保获取数据并相应地显示/隐藏欢迎屏幕。