subclass AA off A, add your ivars there and sub B, C and D off AA
instead?
On May 20, 2009, at 8:09 PM, Graham Cox wrote:
I have a base class in a framework, let's call it A. This has a
number of subclasses, B C and D.
I have some functionality I'd like to add that would apply to all A,
B, C and D. So a category on A would be fine - except that I need
some support in the form of a couple of ivars. The added
functionality isn't appropriate to the framework, so though I have
the source for A, adding ivars that have no place there grieves me.
It also grieves me that the solution appears to be separate
subclasses of B, C and D to add the functionality which must be
duplicated for each class.
Any solution I've missed?
--Graham
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