Override a method via ObjC Category and call the default implementation?

If you want a hackish way to do this that involves mucking with the objective-c runtime you can always use method swizzling (insert standard disclaimers here.) It will allow you to store the different methods as arbitrariliy named selectors, then swap them in at runtime as you need them.

From comp.lang. Objective-C FAQ listing: "What if multiple categories implement the same method? Then the fabric of the Universe as we know it ceases to exist.

Actually, that's not quite true, but certainly some problems will be caused. When a category implements a method which has already appeared in a class (whether through another category, or the class' primary @implementation), that category's definition overwrites the definition which was previously present. The original definition can no longer be reached by the Objective-C code.

Note that if two categories overwrite the same method then whichever was loaded last "wins", which may not be possible to predict before the code is launched.

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