Open Radar

 
Summary:
iOS 8.x and iOS 9 are reporting different sizes when viewWillTransitionToSize:withTransitionCoordinator:  is called in a detail view controller of a UISplitViewController.

The iOS 9 size is inaccurate.

Steps to Reproduce:
1) on any iPad,
1) when using a UISplitViewController
2) while the UISplitViewController preferredDisplayMode = .PrimaryOverlay, (other bad results happen in other display modes)  

3) during rotation, depending on orientation, viewWillTransitionToSize:withTransitionCoordinator:  reports a size of either:

CGSize (703.0, 768.0) || CGSize (447.0, 1024.0)


Expected Results:
In iOS 8.x viewWillTransitionToSize:withTransitionCoordinator: reports sizes as shown: 

CGSize (768.0, 1024.0) || CGSize (1024.0, 768.0)

That looks correct... aye?

Actual Results:
iOS 9 viewWillTransitionToSize:withTransitionCoordinator:  reports:

CGSize (703.0, 768.0) || CGSize (447.0, 1024.0)


Version:
iOS 9.0 (13A340)

Notes:
This makes laying out subviews of the detail view controller differently depending on the ratio of height x width impractical in iOS 9.  Any work around I can think of will break at some point when the UIScreen can be an arbitrary size.

Configuration:
iPad 2 simulator | iPad Air simulator | iPad Retina simulator

Attachments:
'testWillTransition.zip' was successfully uploaded.