On 16 Feb 2012, at 2:05 PM, Greg Parker wrote:

> The question is, who retains the observer? The __block __weak variable does 
> not, because it's weak. NSNotificationCenter does not, as I understand it.

I've lost the earlier parts of this thread… Are we talking about 
-[NSNotificationCenter addObserverForName:object:queue:usingBlock:]? The 
documentation says it's necessary to keep an anchoring reference under GC, but:

> (In a reference counted environment, the system retains the returned observer 
> object until it is removed, so there is no need to retain it yourself.)

        — F


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