objective c - Why send a class through +(Class)class before calling a class method? -

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i've been browsing sketch, example program ship xcode, , keep seeing things (not though):

[[myclass class] classmethod]

now, since myclass isn't instance of class, do:

[myclass classmethod]

as experiment though, able make difference between 2 above statements, overriding + (class)class , returning another class! if ever want this, need former version work, can see there could usage this, there really?

it sounds awful idea tampering +class, please enlighten me if there is. thanks!

to see examples, check out method -copy: in sktgraphicsview.m in sketch program found in developer/examples/sketch/.

in case cited, don't see reason calling +class. however, there definitely case calling [[self class] dosomething] instead of [[myclass class] dosomething]. in first case, [self class] can return correct result if object has been subclassed. in second case, myclass class object, means mysubclass not override +dosomething class method.


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