Re: Another Gnarly Objective-C Question!
Re: Another Gnarly Objective-C Question!
- Subject: Re: Another Gnarly Objective-C Question!
- From: Jean-Daniel Dupas <email@hidden>
- Date: Wed, 13 Mar 2013 10:13:07 +0100
Le 13 mars 2013 à 01:55, Wim Lewis <email@hidden> a écrit :
>
> On 12 Mar 2013, at 2:08 AM, Graham Cox wrote:
>> in a + method, [self class] === self. Once you've got that, you've got it.
>>
>>
>>
>> You're overthinking this.
>>
>> A class method is just an instance method of the class object. No magic at all. So all this confusion you've caused yourself about [super class] and so on is wholly unnecessary to correctly use class methods.
>
> To be very slightly pedantic, the only magic here is 'super' --- sending a message to super (which you can only do from a method implementation) is special syntax that searches for the method starting with the implementation's class's superclass, rather than at the receiver's actual class. Everything else is non-magic. (In general, that's been one of the strengths of ObjC: very little magic.)
>
To be ever more pedantic, there is other magic involved when sending a message to a class.
If there is no class method that matches the selector, the runtime will then search for instance methods of the root class. So you can use NSObject instance (like performSelector:) method on all NSObject subclasses.
http://www.sealiesoftware.com/blog/archive/2009/04/14/objc_explain_Classes_and_metaclasses.html
-- Jean-Daniel
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