I tried to create a UILabel
in playground but failed. Does playground only support OS X development for now?
Edited@2014-11-13: It seems the new xcode 6 had fixed this.
NO, It doesn't. But it's worth noting that you can import UIKit.
If you want to import UIKit you cound follow this:
then you could import UIKit or some module for iOS
ps. I try to create a UIImageView but it doesn't show the correct image on the right side. It seem worthless to import UIKit