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Possible Duplicate:
Creating an abstract class in Objective C
I’d like to make abstract class in Objective-C project.
But, I can’t find ideas suchlike ‘abstract'(in java), ‘virtual'(in c++).
Doesn’t Objective-C have an abstract idea? Thank you.
Formally, no. Abstract classes are implemented by stubbing out methods in the base class and then documenting that a subclass must implement those methods. The onus is on the author to write classes that match the class contract rather than on the compiler to check for missing methods.
Objective-C has protocols, which are like Java interfaces. If you’re looking for the equivalent to a pure virtual C++ class or an interface in Java, this is what you want.