Things like this drive me crazy when debugging:
(lldb) p self.bounds error: unsupported expression with unknown type error: unsupported expression with unkno
Starting from Xcode 6.3, we have a better solution. In short, you need to import UIKit for LLDB to know about these types: expr @import UIKit. Check out this article to learn some tricks to make your life even easier.
expr @import UIKit