Stack navigator example

createStack.js

import * as React from 'react';
import { Text, View, StyleSheet } from 'react-native';
import { Constants } from 'expo';
import { createStackNavigator, createAppContainer } from 'react-navigation'

const routes = {
  Home: () => (
    <View style={styles.container}>
      <Text style={styles.paragraph}>Home Screen</Text>
    </View>
  ),
}

const App = createStackNavigator(routes)

export default createAppContainer(App)

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    paddingTop: Constants.statusBarHeight,
    backgroundColor: '#ecf0f1',
    padding: 8,
  },
  paragraph: {
    margin: 24,
    fontSize: 18,
    fontWeight: 'bold',
    textAlign: 'center',
  },
});