Re: Stupid objective-c question
Re: Stupid objective-c question
- Subject: Re: Stupid objective-c question
- From: Uli Kusterer <email@hidden>
- Date: Sat, 24 Sep 2016 04:28:04 +0200
> On 22 Sep 2016, at 03:36, Graham Cox <email@hidden> wrote:
>
>
>> On 22 Sep 2016, at 10:40 AM, Quincey Morris <email@hidden> wrote:
>>
>> On Sep 21, 2016, at 17:01 , Graham Cox <email@hidden> wrote:
>>>
>>> This should be: if([(NSString*)context isEqualToString:@“mediaLibraryLoaded”])…
>>
>> Actually, this is not a good idea either, because *other* observations — ones you don’t control — might use a value that’s not an object, or not even a valid pointer.
>
>
> Fair point.
>
> Which is yet another reason why void* is such a shitty concept. Apple could easily have insisted that parameter was id<NSObject> without any real problems, so void*… sheesh.
>
> So Gabriel’s alternative is basically to use a global address, as you otherwise suggested.
>
> void* tsk… *goes away muttering*
No. It is not supposed to be a refCon or userInfo. It's a unique identifier for this observation (which can't be "self", because then observations registered by a subclass would get the same identifier as observations registered by the base class, and if one unsubscribes or re-subscribes earlier than the other, one could remove the other's observation and would break things.
Cheers,
-- Uli Kusterer
"The Witnesses of TeachText are everywhere..."
http://www.zathras.de
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