Open Radar

 
Area:
UIKit

Summary:
I have a split view, with both master and detail view controllers being the root of navigation controllers.

Master has the new large titles enabled, detail has not.

When the master pushes a new view controller from code, the animation doesn't happen smoothly, but jumps at the end (see attached video). Pop animations seem to be fine.

Steps to Reproduce:
- Launch the attached project on an iPhone
- Tap on the plus bottom in the top right
- Tap on the new cell
- Observe how the navigation bar jumps at the end of the push animation

Expected Results:
Animation should be smooth.

Observed Results:
Animation doesn't happen smoothly and jumps at the end.

Version:
iOS 11 beta 6 (15A5354b)

Notes:
I noticed that sometimes showing a detail view controller from storyboard is fine (e.g. when you create a new project in Xcode 9 and select "Master-Detail App"), although in my large project something similar happens in one instance even when using storyboards.

Configuration:
Happens on devices where split view controller is collapsed.