- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
       UITouch *touch = [touches anyObject];     gestureStartPoint = [touch locationInView:self.view]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
       UITouch *touch = [touches anyObject];     CGPoint currentPosition = [touch locationInView:self.view];     CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x);     CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y); if (deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance) {
           label.text = @"Horizontal swipe detected";         [self performSelector:@selector(eraseText)                    withObject:nil afterDelay:2];     } else if (deltaY >= kMinimumGestureLength &&                deltaX <= kMaximumVariance){
           label.text = @"Vertical swipe detected";         [self performSelector:@selector(eraseText) withObject:nil                    afterDelay:2];     } }

亦可以使用Automatic Gesture Recognition ：(UIGestureRecognizer)

- (void)viewDidLoad {
           [super viewDidLoad];     UISwipeGestureRecognizer *vertical = [[UISwipeGestureRecognizer alloc]             initWithTarget:self action:@selector(reportVerticalSwipe:)];     vertical.direction = UISwipeGestureRecognizerDirectionUp|     UISwipeGestureRecognizerDirectionDown;     [self.view addGestureRecognizer:vertical];     UISwipeGestureRecognizer *horizontal = [[UISwipeGestureRecognizer alloc]             initWithTarget:self action:@selector(reportHorizontalSwipe:)];     horizontal.direction = UISwipeGestureRecognizerDirectionLeft|     UISwipeGestureRecognizerDirectionRight;     [self.view addGestureRecognizer:horizontal]; }

然后加上自定义的两个响应方法：

- (void)reportHorizontalSwipe:(UIGestureRecognizer *)recognizer {
           label.text = @"Horizontal swipe detected";     [self performSelector:@selector(eraseText) withObject:nil afterDelay:2]; } - (void)reportVerticalSwipe:(UIGestureRecognizer *)recognizer {
           label.text = @"Vertical swipe detected";     [self performSelector:@selector(eraseText) withObject:nil afterDelay:2]; }

就OK啦！

以上的只是单个轻扫动作，下面的是多个轻扫动作同时进行的情况：

在viewDidLoad中添加循环：

- (void)viewDidLoad {
           [super viewDidLoad]; for (NSUInteger touchCount = 1; touchCount <= 5; touchCount++) {
               UISwipeGestureRecognizer *vertical;         vertical = [[UISwipeGestureRecognizer alloc] initWithTarget:self                                                              action:@selector(reportVerticalSwipe:)];         vertical.direction = UISwipeGestureRecognizerDirectionUp|         UISwipeGestureRecognizerDirectionDown;         vertical.numberOfTouchesRequired = touchCount;         [self.view addGestureRecognizer:vertical];         UISwipeGestureRecognizer *horizontal;         horizontal = [[UISwipeGestureRecognizer alloc] initWithTarget:self                                                                action:@selector(reportHorizontalSwipe:)];         horizontal.direction = UISwipeGestureRecognizerDirectionLeft|         UISwipeGestureRecognizerDirectionRight;         horizontal.numberOfTouchesRequired = touchCount;         [self.view addGestureRecognizer:horizontal];     } }

修改对于响应动作函数：

- (void)reportHorizontalSwipe:(UIGestureRecognizer *)recognizer {
           label.text = [NSString stringWithFormat:@"%@Horizontal swipe detected",                   [self descriptionForTouchCount:[recognizer numberOfTouches]]];     [self performSelector:@selector(eraseText) withObject:nil afterDelay:2]; } - (void)reportVerticalSwipe:(UIGestureRecognizer *)recognizer {
           label.text = [NSString stringWithFormat:@"%@Vertical swipe detected",                   [self descriptionForTouchCount:[recognizer numberOfTouches]]];;     [self performSelector:@selector(eraseText) withObject:nil afterDelay:2]; }

- (NSString *)descriptionForTouchCount:(NSUInteger)touchCount {
       switch (touchCount) {
       case 2: return @"Double "; case 3: return @"Triple "; case 4: return @"Quadruple "; case 5: return @"Quintuple "; default: return @"";     } }