It really just needs to be unique in your class hierarchy, right?
True, but not particularly useful. Your class hierarchy includes
NSObject, which is free to observe whatever it feels like in your
objects.
No this is not generally true, so just forget about that and instead
ensure that the context pointers are globally unique.
If you use a constant string, you should make sure that the
string *contents* are unique, in order to ensure uniqueness of the
pointer to it. So don't call it @"context", use @"MyFunkyClass KVO
observer context". After all there's no penalty for being verbose in
this case. Of course using a pointer to a global solves this too.
The penalty for using constant strings is that they will end up
wasting space in your binary...
Rons suggestion is probably optimal.
j o a r
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