Styjun

I'm moving my views by

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(moveRight:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:1];
[panRecognizer setDelegate:self];
[bubbleView[rightCnt] addGestureRecognizer:panRecognizer];
[panRecognizer release];

Now , I want to do same thing by drag with long press.

Any idea?

UILongPressGestureRecognizer already does what you want for you. Take a look at the UIGestureRecognizerState property. From the documentation:

Long-press gestures are continuous. The gesture begins
(UIGestureRecognizerStateBegan) when the number of allowable fingers
(numberOfTouchesRequired) have been pressed for the specified period
(minimumPressDuration) and the touches do not move beyond the
allowable range of movement (allowableMovement). The gesture
recognizer transitions to the Change state whenever a finger moves,
and it ends (UIGestureRecognizerStateEnded) when any of the fingers
are lifted.

So essentially after your UILongPressGestureRecognizerselector is called you listen to UIGestureRecognizerStateBegan, UIGestureRecognizerStateChanged, UIGestureRecognizerStateEnded. Keep changing your views frame during UIGestureRecognizerStateChanged.

- (void)moveRight:(UILongPressGestureRecognizer *)gesture

 if(gesture.state == UIGestureRecognizerStateBegan)
 
 //if needed do some initial setup or init of views here
 
 else if(gesture.state == UIGestureRecognizerStateChanged)
 
 //move your views here.
 [yourView setFrame:];
 
 else if(gesture.state == UIGestureRecognizerStateEnded)
 
 //else do cleanup
 

@implementation MyViewController 
 CGPoint _priorPoint;


- (void)moveRight:(UILongPressGestureRecognizer *)sender 
 UIView *view = sender.view;
 CGPoint point = [sender locationInView:view.superview];
 if (sender.state == UIGestureRecognizerStateChanged) 
 CGPoint center = view.center;
 center.x += point.x - _priorPoint.x;
 center.y += point.y - _priorPoint.y;
 view.center = center;
 
 _priorPoint = point;

In Swift this can be achieved using below code

class DragView: UIView { 
 // Starting center position
 var initialCenter: CGPoint?

 override func didMoveToWindow() 
 super.didMoveToWindow()
 // Add longPress gesture recognizer
 let longPress = UILongPressGestureRecognizer(target: self, action: #selector(longPressAction(gesture:)))
 addGestureRecognizer(longPress)
 

 // Handle longPress action
 func longPressAction(gesture: UILongPressGestureRecognizer) 
 if gesture.state == .began 
 guard let view = gesture.view else 
 return
 
 initialCenter = gesture.location(in: view.superview)
 
 else if gesture.state == .changed 
 guard let originalCenter = initialCenter else 
 return
 

 guard let view = gesture.view else 
 return
 

 let point = gesture.location(in: view.superview)

 // Calculate new center position
 var newCenter = view.center;
 newCenter.x += point.x - originalCenter.x;
 newCenter.y += point.y - originalCenter.y;

 // Update view center
 view.center = newCenter
 
 else if gesture.state == .ended 
 ...
 

You do not need to declare _priorPoint;

In my case, i only want the view to move horizontally so i'm only changing the x coordinate.

Here is my solution:

 if (longpressGestRec.state == UIGestureRecognizerStateChanged)
 
 UIView *view = longpressGestRec.view;

 // Location of the touch within the view.
 CGPoint point = [longpressGestRec locationInView:view];

 // Calculate new X position based on the amount the gesture
 // has moved plus the size of the view we want to move.
 CGFloat newXLoc = (item.frame.origin.x + point.x) - (item.frame.size.width / 2);
 [item setFrame:CGRectMake(newXLoc,
 item.frame.origin.y,
 item.frame.size.width,
 item.frame.size.height)];
 

Thanks to Hari Kunwar for the Swift code, but the longPressAction function is not correctly defined.

Here's an improved version:

@objc func longPressAction(gesture: UILongPressGestureRecognizer) 
 if gesture.state == UIGestureRecognizerState.began 
 
 else if gesture.state == .changed 
 guard let view = gesture.view else 
 return
 
 let location = gesture.location(in: self.view)
 view.center = CGPoint(x:view.center.x + (location.x - view.center.x),
 y:view.center.y + (location.y - view.center.y))
 
 else if gesture.state == UIGestureRecognizerState.ended