iOS四个方向的手势

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- (void)handleSwipe:(UISwipeGestureRecognizer *)gesture {     UISwipeGestureRecognizerDirection direction = gesture.direction;     switch (direction) {         case UISwipeGestureRecognizerDirectionLeft:                           break;         case UISwipeGestureRecognizerDirectionDown:             break;         case UISwipeGestureRecognizerDirectionRight:             break;         case UISwipeGestureRecognizerDirectionUp:             break;         default:             break;     } }   - (void)viewDidLoad {     //建立滑动手势     //设置滑动方向，下面以此类推     UISwipeGestureRecognizer *recognizer;           //向右滑动     recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];     [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];     [[self view] addGestureRecognizer:recognizer];     [recognizer release];           //向左滑动     recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];     [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];     [[self view] addGestureRecognizer:recognizer];     [recognizer release];           //向上滑动     recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];     [recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)];     [[self view] addGestureRecognizer:recognizer];     [recognizer release];           //向下滑动     recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];     [recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)];     [[self view] addGestureRecognizer:recognizer];     [recognizer release]; }