Objective-C方法不可以引用吗？

C++方法可以做到参数可以按值引用，Objective-C不可以吗？

看代码：

- (void)viewDidLoad {

   [super viewDidLoad];

   UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];

   button.frame=CGRectMake(50,50,300,50);

   [buttonsetTitle:@"我是一个按钮" forState:UIControlStateNormal];

   [buttonaddTarget:self action:@selector(Method:) forControlEvents:UIControlEventTouchUpInside];

   [self.viewaddSubview:button];

   // Do any additional setup after loading the view.

}

- (void)Method:(UIButton*)sender
{

   sender.backgroundColor = [UIColor colorWithRed:arc4random() % 255 / 255.0 green:arc4random() % 255 / 255.0 blue:arc4random() % 255 / 255.0 alpha:1.f];

}

看效果