Conditionally overriding a system method via categories in Objective-C?

Yes, this is possible. Since you are targetting 10.5+ I'm assuming you are using the ObjC2 runtime, which makes it fairly straightforward.

I would compile +NSSortDescriptor sortDescriptorWithKey:ascending: in a category into a separate bundle. Then at the very beginning of your main, check if the NSSortDescriptor class has the sortDescriptorWithKey:ascending: method with respondsToSelector:. If it's not implemented (i.e.

You are running on.

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