ionic 2 page change event

Question

I want to execute some code every time the page changes.

I could add add an ngOnDestroy method to every page. It appears that I could use Ionic 2 page lifec

Answer 1

Ionic2 doesn't use Angular2's Router. They have their own implementation NavController.

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I see that you can subscribe to Angular 2 Router events. How do I translate that for use in Ionic 2?

You can merge all the NavController Events and subscribe to it.

allEvents = Observable.merge(
                 this.navController.viewDidLoad, 
                 this.navController.viewWillEnter, 
                 this.navController.viewDidEnter, 
                 this.navController.viewWillLeave, 
                 this.navController.viewDidLeave, 
                 this.navController.viewWillUnload);

allEvents.subscribe((e) => {
    console.log(e);
});