#protocols

I sometimes see code where the delegate has a type of NSObject rather than id: id<CustomDelegate> delegate; NSObject<CustomDelegate> *delegate; and when asked "why" I'm always told the same answer: "So that when using the delegate I can use the performSelector method" This has always seemed odd to me, as when I am using the UITextfield delegate I can use performSelector even through that delegate is of type id. Some investigation of how these two types of delegates worked…