UIGestureRecognizer gesture operation, uigesturerecognizer

UIGestureRecognizer gesture operation, uigesturerecognizer

UIGestureRecognizer class is used to detect, recognize the gestures used by users when using devices, and define the basic behavior of all gestures. The following is a subclass of UIGestureRecognizer.

Click gesture

Click the gesture UITapGestureRecognizerUITapGestureRecognizer * singleTap = [[UITapGestureRecognizer alloc] initWithTarget: self action: @ selector (singleTap :)]; [self. view addGestureRecognizer: singleTap]; // Click Event-(void) singleTap :( UITapGestureRecognizer *) tapgestrue {NSLog (@ "click ");}

Double-click gesture

UITapGestureRecognizerUITapGestureRecognizer * doubleTap = [[UITapGestureRecognizer alloc] initWithTarget: self action: @ selector (doubleTap :)]; doubleTap. numberOfTapsRequired = 2; [self. view addGestureRecognizer: doubleTap]; // double-click the gesture [singleTap Reset: doubleTap]; // double-click the event-(void) doubleTap :( UITapGestureRecognizer *) taggestrue {NSLog (@ "double-click ");}

Swipe gesture

UISwipeGestureRecognizer * swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget: self action: @ selector (swipe :)]; // you can specify the swipe direction. direction = UISwipeGestureRecognizerDirectionDown; [self. view addGestureRecognizer: swipeGesture]; // sweep event-(void) swipe :( UISwipeGestureRecognizer *) swipeGesture {NSLog (@ "sweep gesture ");}

// Translation

UIPanGestureRecognizer * panGesture = [[UIPanGestureRecognizer alloc] initWithTarget: self action: @ selector (pan :)]; [self. view addGestureRecognizer: panGesture]; // pan event-(void) pan :( UIPanGestureRecognizer *) pan {CGPoint point = [pan locationInView: self. view]; NSLog (@ "% @", NSStringFromCGPoint (point ));}

// Long-pressed gesture

UILongPressGestureRecognizer * longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget: self action: @ selector (longPress :)]; longPressGesture. minimumPressDuration = 2; [self. view addGestureRecognizer: longPressGesture]; // longPress gesture event-(void) longPress :( UILongPressGestureRecognizer *) longPress {// call it once when Long press leaves, so you need to set the gesture status if (longPress. state = UIGestureRecognizerStateEnded) {return;} NSLog (@ "Long press for more than two seconds ");}

// Rotating gesture

UIRotationGestureRecognizer * rotation = [[UIRotationGestureRecognizer alloc] initWithTarget: self action: @ selector (rotation :)]; [self. view addGestureRecognizer: rotation]; // rotation event-(void) rotation :( UIRotationGestureRecognizer *) rotation {// obtain the float degree = rotation Angle Based on the rotation radians. rotation * (180/M_PI); NSLog (@ "% f", degree );}