How to conform to a self-made protocol?

Question

I have a class with an delegate property. Anyone who wants to be a delegate must conform to a protocol. I defined everything like this:

#import 

        

Answer 1

I think you need to #import the header file that defines the protocol. How can the compiler know which methods are available without it?

If you use another class (i.e., as an ivar or as a parameter to a method) then you can use a forward declaration. But if you subclass then you need to #import.