返回时没有调用ngOnInit

Question

I noticed that the ngOnInit() method gets not called when I come back to the page which is already instanced. I have to use any other method for this? I need a method which is called everytime when he is visiting the specific page.

EDIT Tested already onPageWillEnter() but it gets not fired in Ionic 2

Answer 1

Check Lifecycle Events section in the link.

You can use ionic 2 lifecycle hook

ionViewWillEnter(){
 //your methods
}

Answer 2

To recall ngOnInit everytime when page is visiting, you should use ngOnDestroy. For example, if your component content depends on code in url, you should use OnDestroy, in this way:

export class GRMTasksComponent implements OnInit, OnDestroy {

   subParams: Subscription;

   ngOnInit() {
        this.subParams = this._route.params.subscribe(params => {
           //some code...
      });
   }

   ngOnDestroy() {
        this.subParams.unsubscribe();
   }
}

Answer 3

If you change a route so that only a parameter value changed, then the component is reused.

You can use

constructor(router:Router) {
  router.params.subscribe(val => myInit());
}

to call your initialization code instead of using ngOnInit() in such cases.