訂閱和退訂不離子2

Question

工作，我注意到，每一次我在推棧頁面時，它調用ionViewloaded和我添加subscribe()我的問題是我不能退訂，當我彈出的頁面。這是我的代碼。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

兩個答案不能爲打字稿執行不承認無效的傳球價值訂閱實例，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(); 
}