React Native之通过DeviceEventEmitter发送和接收事件

import React from 'react';
import {View, Text} from 'react-native';
import {DeviceEventEmitter} from "react-native";
export default class App extends React.Component {
       constructor(props) {
          super(props); 
          this.state = {name: '点击我'};
       }
       render() {
          return (
            <View style={{flex: 1, alignItems: 'center', justifyContent: 'center'}}>
              <Text
            onPress={() => this._press()}
               >{this.state.name}</Text>
            </View>
          );
       }
       componentDidMount() {
           this.emitter = DeviceEventEmitter.addListener("hello", (data) => {
         console.log("收到通知了:内容是:" + data);
         this.setState({name: data});
           });
       }
       _press = () => {
           DeviceEventEmitter.emit('hello', 'chenyu');
       }
       componentWillUnmount() {
           this.emitter.remove();
       }
}