SAPUI5 Call OnInit() Function

Hi Experts,

I use xml view and js controller on my SapUI5 App.

My problem is that, For example I have 2 page and I use this.nav.to("2.page") func. to navigate betwwen view.

When I nav.to second page first time, 2. page controller call onInit(), onAfterRendering() and onBeforeRendering() functions. After than I nav back to 1. page and nav.to 2.back there  doesn't call any function.So I don't do anything second time call 2.page.

How can call OnInit function whenever nav.to 2.page or

Are there any function like as pageonload in SAPUI5?

thanks,