如何在React Native中显示来自App.Js的Drawable Navigation？

Question

我创建了一个常量const drawbleItems来托管我的应用程序中我想要的可绘制导航菜单的屏幕，

如何在我的反应应用程序中显示它？

这是我的代码：

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 */
import React, { Component } from 'react';
import { DrawerNavigator } from 'react-navigation';
import {
  Platform,
  StyleSheet,
  Text,
  View
} from 'react-native';

import TreeBar from './UI/TreeBar';
import PieBar from './UI/PieBar';
import StockBar from './UI/StockBar';
import SmoothBar from './UI/SmoothBar';
import ScatterBar from './UI/ScatterBar';
import RadarChart from './UI/RadarChart';


const drawbleItems = DrawerNavigator({
  Tree: {
    screen: TreeBar,
  },
  Pie: {
    screen: PieBar,
  },
  Stock: {
    screen: StockBar,
  },
  Smooth: {
    screen: SmoothBar,
  },
  Scatter: {
    screen: ScatterBar,
  },
  Radar: {
    screen: RadarChart,
  },
});


const instructions = Platform.select({
  ios: 'Press Cmd+R to reload,\n' +
    'Cmd+D or shake for dev menu',
  android: 'Double tap R on your keyboard to reload,\n' +
    'Shake or press menu button for dev menu',
});

type Props = {};

export default class App extends Component<Props> {


  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>
          Hi
        </Text>
        <Text style={styles.instructions}>
          To get started, edit App.js
        </Text>
        <Text style={styles.instructions}>
          {instructions}
        </Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});