如何获得方法的精髓? [英] How to get the arity of a method?

问题描述

例如，在Javascript中，您可以通过func.length来获得Arity(函数应采用的参数数量).如何在Objective-C中获取有关此方法的信息?

In Javascript, for example, you can get the arity (the number of arguments a function is supposed to take) by simply func.length. How can I get this information for a method in Objective-C?

推荐答案

NSMethodSignature is awesome for all kind of reflection information.

SEL selector = @selector(foo:);
NSMethodSignature *sig = [someObj methodSignatureForSelector:selector]
int argCount = [sig numberOfArguments];

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