订阅和退订不离子2

Question

工作，我注意到，每一次我在推栈页面时，它调用ionViewloaded和我添加subscribe()我的问题是我不能退订，当我弹出的页面。这是我的代码。它不起作用。

ionViewDidLoad() { 
    this.user = this.navParams.data; 
    this.events.subscribe('close:userPopOver', this.onRemovePopOver.bind(this)); 
} 

ionViewWillLeave() { 
    alert('FIRES!!'); 
    this.events.unsubscribe('close:userPopOver', this.onRemovePopOver.bind(this)); 
} 

Answer 1

两个答案不能为打字稿执行不承认无效的传球价值订阅实例，使其工作 this.events.unsubscribe('close:userPopOver',null)

https://forum.ionicframework.com/t/events-pub-sub-how-to-unsubscribe-in-lifecycle-hook/50596/5

Answer 2

private sub : Subscription; 

ionViewDidLoad() { 
    this.user = this.navParams.data; 
    this.sub = this.events.subscribe('close:userPopOver', this.onRemovePopOver.bind(this)); 
} 

ionViewWillLeave(){ 
    alert('FIRES!!'); 
    this.sub.unsubscribe(); 
}