How to avoid “incomplete implementation” warning in partial base class

Question

I have created a protocol that my classes need to implement, and then factored out some common functionality into a base class, so I did this:

@protocol MyPr         


        

Answer 1

In Obj-C, there is no concept of abstract class. So that, you can not let your Base class to be abstract (which means dont' implements all methods in the protocol). You can only have 2 choices. Let the method in protocol to be optionol and then implements it yourself in the derived class. Or, force all classes in the hierarchy to implement it, but let the caller to be careful not call the incorrect method ones