Ionic3 发布/订阅

Ionic3 发布/订阅

---

官网文档地址：
https://ionicframework.com/docs/api/util/Events/

发布

import { Events } from 'ionic-angular';    //导入
...
export class EventsPage {
  user = '来自Events的数据'

  constructor(public events: Events) {}

  publishEvents(user) {
    console.log('User created!')
    this.events.publish('user:created',this.user, Date.now());
    console.log(this.user)
  }
}

订阅

import { Component} from '@angular/core';
import { Events } from 'ionic-angular';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
  myEvent;
  constructor(public events: Events) {
    events.subscribe('user:created', (user, time) => {
      HomePage.prototype.myEvent = user; 
    });
  }
}

方法

publish(topic, eventData)

发布主题

参数	类型	说明
topic	string	发布的主题
eventData	any	数据

subscribe(topic, handler)

订阅数据

参数	类型	说明
topic	string	the topic to subscribe to
handler	function	the event handler

unsubscribe(topic, handler)

取消订阅

参数	类型	说明
topic	string	the topic to unsubscribe from
handler	function	the event handler

返回值:如果被移除成功,返回true