How to override a superclass' property with more specific types?

Question

The Scenario
I have a situation where a base class called AbstractRequest has a delegate property of type id

Answer 1

The warning already gave the right clue. I used @dynamic in the overriding subclass and all is good.

Answer 2

Just synthesize id<ConcreteRequestDelegate>delegate in the ConcreteRequest.m it will work fine...It won't create any problem.