Re: [Pyobjc-dev] PyObjcC class method swizzling

[Ronald O. <ron...@ma...>]

On 19 Sep, 2009, at 14:02, Lukas Pitschl | Dressy Vagabonds wrote:

> Hi everyone!
>
> I've just recently started to explore the power of PyObjC by rewriting
> the GPGMail plugin and I'm more than impressed.
> A big compliment to the developers!
>
> Unfortunately at the moment I'm stuck with class method swizzling.
> I've found a very nice decorator which can be used
> to swizzle instance methods:
>
> def swizzle(*args):
>     cls, SEL = args
>     def decorator(func):
>         oldIMP      = cls.instanceMethodForSelector_(SEL)
>         def wrapper(self, *args, **kwargs):
>             return func(self, oldIMP, *args, **kwargs)
>         newMethod   = objc.selector(wrapper,
>                                     selector  = oldIMP.selector,
>                                     signature = oldIMP.signature)
>         objc.classAddMethod(cls, SEL, newMethod)
>         return wrapper
>     return decorator
>
> My poor attempt to convert this into a decorator which swizzles class
> methods looks like the one below, but unfortunately doesn't
> work.
>
> def swizzleClassMethod(*args):
>     cls, SEL = args
>     def decorator(func):
>         oldIMP      = cls.methodForSelector_(SEL)
>         def wrapper(klass, *args, **kwargs):
>             return func(klass, oldIMP, *args, **kwargs)
>         newMethod   = objc.selector(wrapper,
>                                     selector  = oldIMP.selector,
>                                     signature = oldIMP.signature)
>         objc.classAddMethod(cls, SEL, newMethod)
>         return wrapper
>     return decorator

Have you tried adding "isClassMethod=True" to the argument list of  
objc.selector?

Your current code creates an instance method.

Ronald