componentDidMount(){
    var self = this;
    this.listener =DeviceEventEmitter.addListener('xxxName',function(param){
    //  use param do something
//xxxName:通知的名称    param:接收到的消息（传参）
componentWillUnmount(){
      this.listener.remove();
//在componentWillUnmount 内需要我们手动移除通知

我的页面在获取到用户数据后：

  //注册监听事件，时间名称：changeMine  传参：jsonData.avatar（头像url）
    DeviceEventEmitter.emit('changeMine',jsonData.avatar);

tabbar.js文件

componentDidMount(){
    var self = this;
    this.listener = DeviceEventEmitter.addListener('changeMine',function(url){
        self.setState({
          avatar:url
//通知开始，获取到url，调用setState 方法，刷新状态机，这时候实时的刷新了‘我的’图标
//最后别忘了移除通知
componentWillUnmount(){
      this.listener.remove();
_share(type = undefined) {
    if (this.props.type === 'letter') {
      DeviceEventEmitter.emit('_getSharePage', type); //全局注册分享事件
<Button
  onPress={() => {
                this._share('wechat')
title={分享到微信}
<Button
  onPress={() => {
                this._share('save')
title={下载海报}
import ViewShot, {captureRef} from "react-native-view-shot";   //将React Native视图捕获到图像。




    

import QRCode from 'react-native-qrcode-svg';   //将React Native图片生成二维码
import CameraRoll from "@react-native-community/cameraroll"; //这里需要pod很多个文件
import {check, PERMISSIONS, RESULTS} from 'react-native-permissions';  //获取手机权限  


componentDidMount() {
    // Toast.hide();
    this.listener = DeviceEventEmitter.addListener('_getSharePage', (params) => {
      captureRef(this.refs.viewShot, {  //通过 ViewShot 绑定的ref来设置截图的类型大小格式
        format: "jpg",
        quality: 1.0,
        result: 'tmpfile',
        // snapshotContentContainer:true
      }).then(
        uri => {  //uri就是返回的图片地址
          switch (params) {
            case 'qq':
              break;
            case 'wechat':
              let message = {
                platform: "wechat_session",
                type: 'image',
                imagePath: uri
              JShareModule.share(message, (map) => {
                if (map.state === 'success') {
                  // Toast.message('分享成功')
              }, (map) => {
                Toast.message('请安装微信后尝试')
                // console.log("share failed, map: " + map);
              break;
            case 'pyq':
              let wechat = {
                platform: "wechat_timeLine",
                type: 'image',
                imagePath: uri
              JShareModule.share(wechat, (map) => {
                // Toast.message('分享成功')
              }, (map) => {
                Toast.message('取消分享')
              break;
            case 'weibo':
              break;
            default:  
              // if(!this.state.select){
              //   Toast.message('请选择封面图')
              //   return;
              if (Platform.OS === 'ios') {
                check(PERMISSIONS.IOS.PHOTO_LIBRARY).then(response => {
                  // if (response === 'authorized') {
                  // } else {
                  //   Toast.message('保存相片的权限没开启,请在iPhone的“设置-隐私”选项中,允许修改您的相册')
                  switch (response) {
                    case RESULTS.UNAVAILABLE:
                      console.log(
                        'This feature is not available (on this device / in this context)',
                      break;
                    case RESULTS.DENIED:
                      console.log(
                        'The permission has not been requested / is denied but requestable',
                      break;
                    case RESULTS.GRANTED:
                      console.log('The permission is granted');
                      CameraRoll.saveToCameraRoll(uri,'photo').then(res => {
                        Toast.message('邀请好友截图保存成功');
                      }).catch(err => {
                        Toast.message(err);
                      break;
                    case RESULTS.BLOCKED:
                      console.log('The permission is denied and not requestable anymore');
                      break;
                }).catch(err => {
                  console.log('看看错误是什么',err);
                  Toast.message('有错误找原因')
              } else {
                try {
                  PermissionsAndroid.request(
                    PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE
                  ).then(granted => {
                    if (granted === PermissionsAndroid.RESULTS.GRANTED) {
                      CameraRoll.saveToCameraRoll(uri, 'photo').then(res => {
                        Toast.message('邀请好友截图保存成功');
                      }).catch(err => {
                        Toast.message(err);
                    } else {
                      Toast.message('保存失败, 请授予权限');
                  }).catch(err => {
                    Toast.message('保存失败, 请授予权限');
                } catch (err) {
                  Toast.message('保存失败, 请授予权限');
              break;
        error => {
          Toast.message(error);
      ).catch(err => { 
        console.log(err);
 <ViewShot ref="viewShot" >
      <QRCode
        value={Config.domain + '/web/register?invite_code=' + this.props.inviteCode}
        size={168}
        bgColor='#000'
        fgColor='white'
 </ViewShot>
componentDidMount(){
    let self = this;
   this.listener =DeviceEventEmitter.addListener('footerRefresh',function(func){
      self.refreshTrade = func
 componentWillUnmount(){
    this.listener.remove();
//当触发上拉加载的时候 
this.refreshTrade &&  this.refreshTrade()
  getOrderList(clean = false,use = true) {
    this.setState({loading: true});
    Http.post('/api/v1/ok/spot/orders', {
      pers: 10,
      page: clean ? 1 : this.state.page + 1,
    }).then(res => {
      this.setState({loading: false});
      if (res.status === 10000) {
        //防止监听器一直触发，保持子页面在父页面只有一个监听器
        if(use){
          DeviceEventEmitter.emit('footerRefresh',res.has_next ? ()=>{this.getOrderList(false,false)} : ()=>{});
        this.setState({
          trade: clean ? res.data : this.state.trade.concat(res.data),
          hasNext: res.has_next,
          page: res.page,
    }).catch(err => {
      console.log(err);
      Toast.message('通讯失败');