Add Login to Your React Native Application

import React

// Add this method inside the AppDelegate class
func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
  return RCTLinkingManager.application(app, open: url, options: options)
}

import React from 'react';
import {SafeAreaView, StyleSheet} from 'react-native';
import MainScreen from './src/MainScreen';

const App = () => {
  return (
    <SafeAreaView style={styles.container}>
      <MainScreen />
    </SafeAreaView>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
  },
});

export default App;

import React, {Component} from 'react';
import {
  View,
  Text,
  Button,
  StyleSheet,
  ActivityIndicator,
  Image,
} from 'react-native';
import Auth0, {Credentials} from 'react-native-auth0';

const auth0 = new Auth0({
  domain: '{yourDomain}',
  clientId: '{yourClientId}',
});

interface User {
  name?: string;
  email?: string;
  picture?: string;
}

interface MainScreenState {
  user: User | null;
  isLoading: boolean;
}

class MainScreen extends Component<{}, MainScreenState> {
  constructor(props: {}) {
    super(props);
    this.state = {
      user: null,
      isLoading: true,
    };
  }

  async componentDidMount() {
    await this.checkAuthStatus();
  }

  checkAuthStatus = async () => {
    try {
      const hasValidCredentials = await auth0.credentialsManager.hasValidCredentials();
      if (hasValidCredentials) {
        const credentials = await auth0.credentialsManager.getCredentials();
        const userInfo = await auth0.auth.userInfo({token: credentials.accessToken});
        this.setState({user: userInfo, isLoading: false});
      } else {
        this.setState({isLoading: false});
      }
    } catch (e) {
      console.error(e);
      this.setState({isLoading: false});
    }
  };

  login = async () => {
    try {
      const credentials: Credentials = await auth0.webAuth.authorize({
        scope: 'openid profile email',
      });
      
      await auth0.credentialsManager.saveCredentials(credentials);
      const userInfo = await auth0.auth.userInfo({token: credentials.accessToken});
      this.setState({user: userInfo});
    } catch (e) {
      console.error(e);
    }
  };

  logout = async () => {
    try {
      await auth0.webAuth.clearSession();
      await auth0.credentialsManager.clearCredentials();
      this.setState({user: null});
    } catch (e) {
      console.error(e);
    }
  };

  render() {
    const {user, isLoading} = this.state;

    if (isLoading) {
      return (
        <View style={styles.container}>
          <ActivityIndicator size="large" color="#0066cc" />
          <Text style={styles.loadingText}>Loading...</Text>
        </View>
      );
    }

    return (
      <View style={styles.container}>
        <Text style={styles.title}>Auth0 React Native</Text>

        {user ? (
          <View style={styles.profileContainer}>
            {user.picture && (
              <Image source={{uri: user.picture}} style={styles.avatar} />
            )}
            <Text style={styles.welcomeText}>Welcome, {user.name}!</Text>
            <Text style={styles.emailText}>{user.email}</Text>
            <View style={styles.buttonContainer}>
              <Button title="Log Out" onPress={this.logout} color="#dc3545" />
            </View>
          </View>
        ) : (
          <View style={styles.loginContainer}>
            <Text style={styles.subtitle}>
              Tap the button below to log in
            </Text>
            <View style={styles.buttonContainer}>
              <Button title="Log In" onPress={this.login} color="#0066cc" />
            </View>
          </View>
        )}
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    padding: 20,
  },
  title: {
    fontSize: 28,
    fontWeight: 'bold',
    marginBottom: 20,
    color: '#333',
  },
  subtitle: {
    fontSize: 16,
    color: '#666',
    marginBottom: 30,
    textAlign: 'center',
  },
  loadingText: {
    marginTop: 10,
    fontSize: 16,
    color: '#666',
  },
  profileContainer: {
    alignItems: 'center',
  },
  avatar: {
    width: 100,
    height: 100,
    borderRadius: 50,
    marginBottom: 20,
  },
  welcomeText: {
    fontSize: 22,
    fontWeight: '600',
    marginBottom: 8,
    color: '#333',
  },
  emailText: {
    fontSize: 16,
    color: '#666',
    marginBottom: 30,
  },
  loginContainer: {
    alignItems: 'center',
  },
  buttonContainer: {
    width: 200,
    marginTop: 10,
  },
});

export default MainScreen;