objective-c - 如何使用NSInvocation调用类方法

Question

可以很方便的通过NSObject的
+ (NSMethodSignature *)instanceMethodSignatureForSelector:(SEL)aSelector
方法获取NSMethodSignature，
然后通过NSInvocation的
+ (NSInvocation *)invocationWithMethodSignature:(NSMethodSignature *)signature
生成NSInvocation

这里只能得到instanceMethodSignature，怎么获取类方法？

Answer 1

Create a singleton auxiliary object. The instance method a of the auxiliary object calls the class method b, and then obtains the MethodSignature of a