swift - Debug view hierarchy in Xcode 7.3 fails

Question

This function fails with runtime error:

-[UIWindow viewForFirstBaselineLayout]: unrecognized selector sent to instance 0x7fb9dae257d0

Anybody encountered the same?

UPD:
Fails on simulator iOS 8.1/8.4. 9.3 works fine.

UPD2: UIWindow is created like:

window = UIWindow(frame: UIScreen.mainScreen().bounds)    
window?.rootViewController = RootViewController.rootVC
window?.makeKeyAndVisible()

Answer 1

Looks like Xcode 7.3 uses viewForFirstBaselineLayout property to draw the UI. But this property is marked as available since iOS 9.0.

[UIView viewForFirstBaselineLayout] method should be used for the version prior to iOS 9.0. It seems the guys from Apple didn't consider this case.