text: import * as React from "react";
  import { StatusBar } from "react-native";
  import { createSwitchNavigator } from "react-navigation";
  
  import TourScreen from "./TourScreen";
  import LoginScreen from "./LoginScreen";
  
  export default createSwitchNavigator(
    {
      Tour: TourScreen,
      Login: LoginScreen
    },
    { initialRouteName: "Tour" }
  );
  