Question

We can get NSMethodSignature by + (NSMethodSignature *)instanceMethodSignatureForSelector:(SEL)aSelector of NSObject. Then construct NSInvocation by + (NSInvocation *)invocationWithMethodSignature:(NSMethodSignature *)signature

Here is the problem. We can only get the method signature of instance，how about the class method?

Answer 1

You can get the class methods by:

NSMethodSignature *pMS = [[YourObject class] methodSignatureForSelector: (SEL)aSelector];

The fragment [YourObject class] returns an instance of the class object (singleton) which you can then use to get class methods.

ADD: New info from comments below. You can just do the following:

NSMethodSignature *pMS = [YourObject methodSignatureForSelector: (SEL)aSelector];