Can UIView be copied?

Question

Simply using this way:

UIView* view2 = [view1 copy]; // view1 existed

This will cause simulator can not launch this app.

Try retai

Answer 1

UIView doesn't implement the NSCoping protocol, see the declaration in UIView.h:

@interface UIView : UIResponder

So, if we want to have a copy like method, we need to implement the NSCoping protocol in a category or so.