TabBarIOS中icon的本地加载方式

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 */

import React, { Component } from ‘react‘;
import {
  Platform,
  StyleSheet,
  Text,
  View,
  TabBarIOS,
  StatusBar,
} from ‘react-native‘;

type Props = {};
export default class App extends Component<Props> {
  constructor(props){
    super(props);
    this.state={
      selectedTab:"图书"
    }
  }
  render() {
    return (
      <TabBarIOS>
        <TabBarIOS.Item
          title="图书"
          //每次添加新图片都要重新run一下Xcode
          //下面一行是ES5的写法在ES6中无法使用
          // icon={require("image!book_16")}
          //ES6中的写法为：icon={{uri:‘imageName‘}}
          icon={{uri:‘book_16‘}}
          selected={this.state.selectedTab==="图书"}
          onPress={()=>{
            this.setState({
              selectedTab:"图书"
            })
          }}>
          <View style={{backgroundColor:‘green‘,flex:1}}></View>
        </TabBarIOS.Item>
        <TabBarIOS.Item
          title="电影"
          icon={{uri:‘movie_16‘}}
          selected={this.state.selectedTab==="电影"}
          onPress={()=>{
            this.setState({
              selectedTab:"电影"
            })
          }}>
          <View style={{backgroundColor:‘skyblue‘,flex:1}}></View>
        </TabBarIOS.Item>
      </TabBarIOS>
    );
  }
}