Declare an ObjC parameter that's a Class conforming to a protocol

Question

In Objective-C, it is possible to pass a class as a parameter to a method:

- (void) methodThatTakesClass:(Class)theClass;

And it is possibl

Answer 1

Yes. The following is a valid program which will log the NSObject class.

#import 
void f(Class  c) {
    NSLog(@"%@",c);
}
int main() {
    f([NSObject class]);
}

This would cause a compiler error if you tried to pass a class which doesn't conform to NSObject, such as the Object class. You can also use it for methods.

- (void)printClass:(Class )c;