Thank you as usual Quincey, I didn't think of the header file. Document bug 
filed. 

On Nov 5, 2011, at 2:48 PM, Quincey Morris wrote:

> On Nov 4, 2011, at 22:51 , Roland King wrote:
> 
>> Then I went and looked in the documentation, couldn't find a reference to it 
>> anywhere in iOS, eventually found a note in the 10.5 Leopard release notes 
>> that that pattern had been introduced, that's the only documentation I can 
>> find on it anywhere. 
>> 
>> I'm assuming it works on iOS (only have the sim with me here today, not the 
>> device and so it's possible they might differ) and is the modern way to turn 
>> off observation for single properties, is it? If so I'll file a 
>> documentation bug on it.
> 
> The pattern is documented in the header file (NSKeyValueObserving.h), so it's 
> an officially supported way. Its omission from the regular documentation does 
> look like an oversight.
> 
> 

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