Question

在我的App.js中，我初始化firebase并检查：是否是否有用户，它转到MainPage，否则转到StartPage （stackNavigator） 。而且我想获取用户（firebase.auth（）。currentUser）的电子邮件，以将其显示在MainPage上。但是它返回 RED ERROR PAGE ，其中 NULL不是对象

在我在AndroidStudio上进行编程之前，我是第一次使用Firebase进行本机响应（因此我没有更多的经验）。希望您能帮助您分享经验

下面提供了源代码。

我也在App.js而不是Login.js上写了user.sendEmailVerification()，因为它无法在LoginPage上吸引用户

App.js

import React from 'react';
import { createStackNavigator } from 'react-navigation';
import firebase from 'firebase';
import StartPage from './components/utils/StartPage';
import MainPage from './components/employer/MainPage ';

firebase.initializeApp({
   apiKey: "AIxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
   authDomain: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
   databaseURL: "xxxxxxxxxxxxxxxxxxxxxxxxxxx",
   projectId: "xxxxxxxxxxxxxxxxxxxxxxxxxx",
   storageBucket: "xxxxxxxxxxxxxxxxxxxxxxxxxx",
   messagingSenderId: "xxxxxxxxxxxxxxxxxxx"
});


const AppStackNavigator = createStackNavigator(
  {
   MainPage: MainPage ,
   Start: StartPage,
   Login: Login,
 },
 {
  initialRouteName: 'MainPage',
 }
);
const StartNavigator = createStackNavigator(
 {
   MainPage : MainPage ,
   Start: StartPage,
   Login: Login,
 },
 {
   initialRouteName: 'Start',
 } 
);

export default class App extends React.Component {
  state = {
    user: {},
  };

 componentDidMount() {
  this.authListener();
 }

authListener() {
  firebase.auth().onAuthStateChanged(user => {
    if (user) {
      if (user.emailVerified) {
        this.setState({ user });
      } else {
        user.sendEmailVerification();
        this.setState({ user });
      }
    } else {
       this.setState({ user: null });
    }
   });
  }

 render() {
  return (
     {this.state.user ? <AppStackNavigator /> : <StartNavigator />}
  )
 }
}

HomePage.js

import React from 'react';
import { ScrollView, FlatList, View, Text } from 'react-native';
import { StyleSheet, TouchableOpacity, Image } from 'react-native';
import firebase from 'firebase';

export default class HomePage extends React.Component {
  static navigationOptions = ({ navigation }) => {
  const { params = {} } = navigation.state;
  let headerTitle = 'Home Page';
  let headerLeft = null;
  let headerRight = (
    <TouchableOpacity
      style={styles.headerButton}
      onPress={() => {
        params.onSignout();
      }}>
      <Image
        source={require('./../../assets/logout.png')}
        style={styles.headerImageStylee}
      />
    </TouchableOpacity>
   );

   return {
     headerTitle, headerLeft, headerRight,
   };
  };
 user = firebase.auth().currentUser;

 onSignout = () => {
   Alert.alert('', 'Log out?', [
    { text: 'Yes', onPress: () => console.log('canceled') },
     {
       text: 'No',
       onPress: () => firebase.auth().signOut(),
     },
    ]);
   };

 render() {
   return (
    <View style={styles.container}>
     <Text>`${this.user.email}`</Text>
    </View>
  );
 }
}

P.S。我使用下面的代码发送sendmail验证，但是它没有用，所以我将其复制到App.js

Login.js的一部分-> 注册函数

register = e => {
e.preventDefault();
this.state.password === this.state.rPassword
  ? firebase.auth().createUserWithEmailAndPassword(this.state.email, this.state.password)
      .then(function(user){
        user.sendEmailVerification();
      }).catch(error => {
        Alert.alert('', error.message, [{ text: 'Ок' }]);
      })
  : Alert.alert('', 'Passwords not match', [{ text: 'Ок' }]);
};

在主页Firebase React Native上无法获取currentUser

0 个答案: