Objective-C 相当于 Swift 的“Any”

Question

Is there any way that an Objective-C method could operate on primitive parameters without knowing their types? For instance,

-(Any)returnFirst:(Any)first notSecond:(Any)second  {
  return first;
}

This could then be used like:

int a = [self returnFirst:500 notSecond:1000];
char b = [self returnFirst:'a' notSecond:'b'];

Answer 1

There is no equivalent to Any in Objective-C. Your example returnFirst:notSecond: cannot even be declared in Objective-C.

Answer 2

In Swift 3, the id type in Objective-C now maps to the Any type in Swift, which describes a value of any type, whether a class, enum, struct, or any other Swift type.

Source: https://developer.apple.com/swift/blog/?id=39