How can I set CG_CONTEXT_SHOW_BACKTRACE environmental variable?

Question

I have three buttons in my view. After setting the cornerRadus in the viewDidLoad() : button.layer.cornerRadius = 20 I get the following error message in the lo

Answer 1

This problem happen with Xcode 7. In my case i removed the UIViewControllerBasedStatusBarAppearance from Info.plist and the problem solved! See the answer in this post: