调用超级方法时跳过超类？

Question

This may seem strange, but I would like to do the following:

Class A

- (void)someMethod;

Class B : A

- (void)someMethod; // overrides

Class C : B

- (void)someMethod; // overrides

In class C, I would like to override a method present in the two super classes, but call only Class A's method on a [super methodName] call.

- (void)someMethod
{
  [super someMethod];  // but I want to call class A, not B
}

Possible?

Answer 1

Something like this should work:

// in Class C:
#import <objc/runtime.h>

- (void)someMethod
{
    // I want to call class A's implementation of this method

    IMP method = class_getMethodImplementation([ClassA class], _cmd);

    method(self, _cmd);

}

Answer 2

Well, you could do a hacky solution whereby you pass an integer parameter into the method which is decremented on each super call, such that each method implementation just calls its superclass method until finally you reach 0, then you actually execute the method. It's sort of like a weird form of recursion.