UISwipeGestureRecognizer *swipeRecognizer;

并在我的控制器中：viewDidLoad方法

- (void)viewDidLoad
{
    [super viewDidLoad];


    // Horizontal swipe
    swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self 
                                                                          action:@selector(swipeMethod:)];
    swipeRecognizer.direction = UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft; 
    [self addGestureRecognizer:swipeRecognizer];
}

我的方法来处理刷卡是：

-(void)swipeMethod: (UISwipeGestureRecognizer *) sender
{
    NSLog(@"Swipe!");   
}

当我运行代码并进行滑动时,我什么都没有？我应该得到：滑动！

谢谢.