UINavigationController - how to change animation for single UIViewController - ios

Question

How can I have custom animation only for single UIViewController push/pop and default animation for other UIViewControllers in same UINavigationController?
I use UINavigationController and push/pop to navigate between different UIViewControllers. I created custom animation and set custom UINavigationControllerDelegate to UINavigationController.delegate. It animates fine but it changes animation style for all future push/pop in this UINavigationController.
I know I can change animation for single UIViewController using it's transitioningDelegate but it works only if it's displayed by present() and not push.
Is it possible to change animation only for single UIViewController in UINavigationController?

Answer 1

You can check for specific view controller from navigation controller like:
UINavigationcontroller.ViewControllers[number of that view controller]
and apply that animation on it.

Answer 2

Sub class UINavigationController and use CoreAnimation's transition to change push/pop animations like this.
enum TransitionType {
case fade
case movein
case push
case reveal
}
enum TransitionSubtype {
case right
case left
case top
case bottom
}
class MyNavigationController: UINavigationController {
fileprivate func getTransition(by type: TransitionType) -> String? {
var transition: String?
switch type {
case .fade:
transition = kCATransitionFade
break
case .push:
transition = kCATransitionPush
break
case .movein:
transition = kCATransitionMoveIn
break
case .reveal:
transition = kCATransitionReveal
break
default:
transition = nil
break
}
return transition
}
fileprivate func getSubTransition(by type: TransitionSubtype) -> String? {
var transition: String?
switch type {
case .right:
transition = kCATransitionFromRight
break
case .left:
transition = kCATransitionFromLeft
break
case .top:
transition = kCATransitionFromTop
break
case .bottom:
transition = kCATransitionFromBottom
break
default:
transition = nil
break
}
return transition
}
func display(viewController: UIViewController, animated: Bool, animationType: TransitionType = .push, animationSubtype: TransitionSubtype = .left) -> Bool {
guard let type = getTransition(by: animationType) else {return false}
guard let subtype = getSubTransition(by: animationSubtype) else {return false}
if animated {
let transition = CATransition()
transition.duration = 0.35
transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
transition.type = type
transition.subtype = subtype
self.view.layer.add(transition, forKey: nil)
}
_ = self.pushViewController(viewController, animated: false)
return true
}
func hide(animated: Bool, animationType: TransitionType = .push, animationSubtype: TransitionSubtype = .left) -> Bool {
guard let type = getTransition(by: animationType) else {return false}
guard let subtype = getSubTransition(by: animationSubtype) else {return false}
if animated {
let transition = CATransition()
transition.duration = 0.35
transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
transition.type = type
transition.subtype = subtype
self.view.layer.add(transition, forKey: nil)
}
_ = self.popViewController(animated: false)
return true
}
}