content: import React from 'react';
  import {
    Platform
  } from 'react-native';
  
  import {
    StackNavigator,
    // StackRouter,
    // TabRouter,
    createNavigator,
    createNavigationContainer,
    addNavigationHelpers,
  } from 'react-navigation';
  
  
  import MainTabs from './MainTabs';
  import DrawerView from '../components/DrawerView';
  
  
  const Root = StackNavigator(
    {
      MainTabs: {
        screen: MainTabs,
      }
    },
    {
      initialRouteName: 'MainTabs',
      mode: 'modal',
      headerMode: 'none',
    }
  );
  
  
  const CustomDrawer = createNavigationContainer(
    createNavigator(Root)(DrawerView)
  );
  
  export default CustomDrawer;
  