Question

Suppose I have a class Foo which declares a delegate protocol with 3 methods. I would like to subclass Foo into a class called Bar and completely override these methods.

Should I declare them in the subclass header again?

When I implement these 3 methods inside of Bar‘s delegate, do I have to take any precautions to make sure Foo‘s implementation will not be used?

Answer 1

Should I declare them in the subclass header again?

That won’t be necessary, as your Bar.h will import Foo.h and therefore know it conforms that protocol.

When I implement these 3 methods inside of Bar’s delegate, do I have
to take any precautions to make sure Foo’s implementation will not be
used?

The only precaution you need to take is to not call [super delegateMethod]; on your implementations, and you’re good to go.