React Native Cookbook - Second Edition

How to do it...

1. Let's start by opening the App.js file and adding our imports:

import React from 'react';import {  StyleSheet,  Text,  View,  TouchableOpacity,  Alert} from 'react-native';import Expo from 'expo';

2. Next, we'll declare the App class and add the state object. The state will keep track of whether the user is logged in with the loggedIn Boolean, and will save the retrieved user data from Facebook in an object called facebookUserInfo:

export default class App extends React.Component {  state = {    loggedIn: false,    facebookUserInfo: {}  }  // Defined in later steps}

3. Next, let's define the logIn method of our class. This will be the method that's called when the Login button is pressed. This method uses the logInWithReadPermissionsAsync ...