ios - How to implement a custom NavigationViewController? -

i want implement navigationviewcontroller, uinavigationviewcontroller, no navigationbar , custom push effect.

i know should add view controllers navigationcontroller childviewcontroller, , add views navigationcontroller's view. however, can't handle life cycle methods well, meaning when push , pop viewcontroller, viewwillappeaer viewdiddisapper , other methods should call @ proper time.

i try in popviewcontroller::

    // life cycle     currentvc.viewwilldisappear(animated)     previousvc.viewwillappear(animated)     currentvc.willmovetoparentviewcontroller(nil)      uiview.animatewithduration(self.durationofpop, delay: 0, options: uiviewanimationoptions.curveeaseout,         animations: { () -> void in              // animations             let width = currentvc.view.frame.width             currentvc.view.frame = self.view.frame.rectbyoffsetting(dx: width, dy: 0)             previousvc.view.frame = self.view.bounds          }) { (finished) -> void in             if finished {                 // life cycle                 currentvc.view.removefromsuperview()                 currentvc.removefromparentviewcontroller()                 currentvc.didmovetoparentviewcontroller(nil)                 previousvc.viewdidappear(animated)                  //                 self.viewcontrollers.removelast()             }     } 

i call viewwilldisappear: explicitly let called. has problems when vc has child vc.

i tried transformfromviewcontroller:toviewcontroller... method. let viewwillappear execute within animation block.