Le 13 mars 2013 à 01:55, Wim Lewis <w...@omnigroup.com> 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 _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
