Open Radar

 
Summary:
When a UICollectionReusableView contains a UIViewController’s view as its only child the children of the UICollectionView’s view do not animate their resize while their parent view does. To clarify, I created a demo app to showcase a working and failure case. The demo app can be found at: https://github.com/adamyanalunas/SupplimentaryViewAnimation

Steps to Reproduce:
1. Add any type object that is or subclasses a UIView to the stock UIView (that I’ll now call parent view) of a UIViewController
2. Add the parent view to a UICollectionReusableView (that I’ll now call the supplementary view)
3. Resize the supplementary view inside of a performBatchUpdates to inherit the animations

Expected Results:
Children of the parent view have animation times that match their parent.

Actual Results:
Parent view bounds animate as expected but its children do not; rather, they immediately jump to their destination size.

Regression:
Unknown how far back this bug reaches.

Notes:
Demo app to view the working and broken cases can be found here: https://github.com/adamyanalunas/SupplimentaryViewAnimation