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

subscribe(topic, handler)

订阅数据

unsubscribe(topic, handler)

取消订阅

返回值:如果被移除成功,返回true