root

root.js

import React from 'react';
import {createAppContainer, createStackNavigator} from 'react-navigation';
import FunctionScreen, {navigationOptions} from './src/screen/Function'
import ClassScreen from './src/screen/Class'

const Root = createStackNavigator({
  ClassScreen: {
    screen: ClassScreen
  },
  FunctionScreen:{
    screen: FunctionScreen,
    navigationOptions: navigationOptions
  },
})

export default createAppContainer(Root)