如何在createStackNavigator react本机中传递和检索导航选项中的键值

import { createStackNavigator } from 'react-navigation';

const AppNavigator = createStackNavigator(
  {
    Home: {
      screen: HomeScreen,
      navigationOptions: ({ screenProps }) => ({
        title: screenProps.title, // 通过screenProps获取键值对中的值
      }),
    },
    Details: {
      screen: DetailsScreen,
      navigationOptions: ({ navigation, screenProps }) => ({
        title: navigation.getParam('title', ''), // 通过navigation.getParam获取键值对中的值
      }),
    },
  },
  {
    initialRouteName: 'Home',
  }
);

export default class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      title: 'My App', // 设置初始的键值对
    };
  }

  render() {
    return (
      <AppNavigator screenProps={{ title: this.state.title }} />
    );
  }
}