- (void) touchesBegan: (NSSet *) touches withEvent: (UIEvent *) event; - (void) touchesMoved: (NSSet *) touches withEvent: (UIEvent *) event; - (void) touchesEnded: (NSSet *) touches withEvent: (UIEvent *) event; - (void) touchesCancelled: (NSSet *) touches withEvent: (UIEvent *) event;