Re: Another Gnarly Objective-C Question!
Re: Another Gnarly Objective-C Question!
- Subject: Re: Another Gnarly Objective-C Question!
- From: Dave <email@hidden>
- Date: Wed, 13 Mar 2013 11:54:52 +0000
On 13 Mar 2013, at 09:13, Jean-Daniel Dupas wrote:
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
Yes, I've noticed this, it also works if you put an app-wide
(via .pch file) Category on NSObect, so you can define your own Catch
All + methods, which is very cool IMO!
All the Best
Dave
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