react-native navigation

Navigation.js

import React from 'react';
import { Platform } from 'react-native';
import {
  createBottomTabNavigator,
  createStackNavigator,
  createDrawerNavigator,
  createAppContainer,
  createSwitchNavigator,
  DrawerNavigator
} from 'react-navigation';
import WelcomeScreen from './screens/Welcome';
import HomeScreen from './screens/Home';
import ProfileScreen from './screens/Profile';
import QrReadDetails from './screens/QrReadDetails'
import FavoritesScreen from './screens/Favorites';
import SettingsScreen from './screens/Settings';
import UserWelcomeScreen from './screens/UserWelcomeScreen';

const AppDrawerNavigator = createDrawerNavigator({
    UserWelcomeScreen: {
        screen: UserWelcomeScreen
    }
})

const AppSwitchNavigator = createSwitchNavigator({
    Home: {
        screen: HomeScreen
    }, 
    UserWelcomeScreen: {
        screen: AppDrawerNavigator
    }
})

const AppContainer = createAppContainer(AppSwitchNavigator);

export default AppContainer;