text: import { StackNavigator } from 'react-navigation';
  import EnterNumber from './enterNumber'
  import EnterCode from './enterCode'
  import EnterDetails from './enterDetails'
  import ChooseCity from './chooseCity'
  import CitiesList from './citiesList'
  import UploadPhoto from './uploadPhoto'
  
  export const RegistrationNavigator = StackNavigator({
      enterNumber: {
          screen: EnterNumber
      },
      enterCode: {
          screen: EnterCode
      },
      enterDetails: {
          screen: EnterDetails
      },
      chooseCity: {
          screen: ChooseCity
      },
      citiesList:{
          screen: CitiesList
      },
      uploadPhoto:{
          screen: UploadPhoto
      }
  },
      {
          headerMode: 'none',
          //initialRouteName: 'chooseCity'
      });