App.js

import { View, ScrollView } from 'react-native';
import { createStackNavigator } from 'react-navigation';
import t from 'tcomb-form-native';

import Login from './src/login/Login';
import TeacherForm from './src/components/teachers_form.js';
import Profile from './src/profile/Profile';
import CreateExamModel from './src/examModel/createExamModel';
import ExamTemplateList from './src/examTemplate/examTemplateList'

const Form = t.form.Form;

const App = createStackNavigator(
  { 
    Home: { screen: Login },
    SignUp: { screen: TeacherForm },
    Profile: { screen: Profile },
    CreateExamModel: { screen: CreateExamModel },
    ExamTemplateList: { screen: ExamTemplateList}
  },
  {
    navigationOptions: {
      headerStyle: {
        backgroundColor: 'green',
      },
      headerTintColor: '#fff',
    }
  }
);

export default App;