NSData (again!)
NSData (again!)
- Subject: NSData (again!)
- From: Pascal Goguey <email@hidden>
- Date: Sat, 14 Dec 2002 23:32:58 +0900
Hello!
Summary of the history:
The other day, I asked a question about how to subclass NSData
from the interface builder. I got a few replies (thanks again), and
learned
about forwardInvocation which is a very nice concept. All the replies
I got were telling me that "I should not subclass NSData" or "I probably
don't want to subclass NSData".
I guess it is probably true, that there is probably a good technical
reason
to prefer wrapping to inheritance, otherwise the people who wrote
Project Builder and Interface Builder would have enabled the possibility
to subclass NSData.
Now, what I need to know is WHY it is bad practice to subclass.
There are some subclass (e.g. NSApplocation inherits from NSResponder).
So why should my class not inherit NSData, but only wrap it?
Thanks,
Pascal
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| References: | |
| | >Re: NSData (From: Mike Shields <email@hidden>) |