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 ]; }