Unhiding a view is very slow in CTCallCenter callEventHandler

Question

Reposting with more concise and focused question after original question went unanswered. Also adding more insight into the problem after another day of research:

I

Answer 1

Hm... try to call [yourViewController.view setNeedsDisplay] after you change hidden property. Or avoid hidden, use alpha or addSubview: and removeFromSuperview methods instead.