iOS 9 Orientation Auto-Rotation Animation Not Working, But Always on Main Thread

Question

iOS 9.0 (13A340) Xcode 7.0 (7A220) OS X 10.10.5 (14F27)

I have a situation where if I rotate the simulator or device (using iPhone 6s sim and iPhone 6+ device), the animation does not also take place. I am unsure of why this is happening. I am not doing anything unusual or crazy with any UIKit methods, and I am not calling any method not on the main thread. Additionally, other UIView animations I have added appear to work just fine. It is just the rotation that's broken. Other apps seem fine. I'm not sure what I could be doing wrong.

Attempts to figure out/solve:

• Used this extension by Cocoanetics to attempt to see if any UIKit execution was not on the main thread.
• Printed out the value of UIView.areAnimationsEnabled() during multiple spots in program execution. It always printed true.
• Setting UIView.setAnimationsEnabled(true) did not fix.

I am using a custom "nav" view controller (one I made): SASlideDrawer (Note I am not experiencing this same issue with this project alone)

Thank you.

Answer 1

In my case I had target's "Main Interface" set and in application:didFinishLaunchingWithOptions: I have been creating new window and new rootViewController

Answer 2

I'm instantiating my own view controller stack of a navigation controller in app delegate. I fixed the problem by removing the Main interface from the project file.