iOS: Why do I have white, rounded corners on my modal view?

Question

I have a modal view popping up in my iPad app and for some reason it has white, rounded corners.

It might be worth noting I built this model view in my storyboard, n

Answer 1

Try

[self.view superview].layer.cornerRadius = 21.0f;
[self.view superview].layer.masksToBounds = YES;