NSArray – makeObjectsPerformSelector:withEnumerableArguments:

NSArray – makeObjectsPerformSelector:withEnumerableArguments:

@implementation NSArray ()

- (void)makeObjectsPerformSelector:(SEL)selector withEnumerableArguments:(id<NSFastEnumeration>)arguments {
    for (id object in self) {
        if (object && [object respondsToSelector:selector]) {
            NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[object methodSignatureForSelector:selector]];
            [invocation setSelector:selector];
            [invocation setTarget:object];
            
            if (arguments) {
                [invocation retainArguments];
                
                int argumentIndex = 2; //Indices 0 and 1 are occupied by "self" and "_cmd" respectively
                for (id argument in arguments) {
                    __unsafe_unretained id unretainedArgument = argument == [NSNull null] ? nil : argument;
                    [invocation setArgument:&unretainedArgument atIndex:argumentIndex++];
                }
            }
            
            [invocation invoke];
        }
    }
}

@end