Only animate the navigation bar itself when doing the "push" transiton

Using Swift
1

Hi! I want to only animate the navigation bar when doing the "push" transition. The viewController that's embed into the navigation controller should just switch viewcontroller. Is it possible to do? If so, how can I do it?

2

Probably better to ask this over on the Apple Developer forums, or StackOverflow. This is really about UIKit, not Swift itself.