On 11 Sep 2013, at 16:33, Etienne Samson <samson.etie...@gmail.com> wrote:

> Hi !
> 
> I think the best way for what you're trying to do is to subclass 
> NSNotificationCenter (or at least provide your own framework-wide singleton 
> that quacks like it), wrap -postNotification: with some dictionary-munging 
> code that keeps tracks of the last notification send by notification name, 
> and have -addObserver:… (you'll have to find the one that actually is the 
> designated call, the one all the others expect) check that cache and issue a 
> -postNotification: call for that object only (you don't want to notify all 
> old objects, only the one that just registered).
> 

Great minds and all that! This is more or less what I have, see earlier post 
for details if you are interested.

Thanks a lot
Dave
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