Combining a UILongPressGestureRecognizer with a UIPanGestureRecognizer

user_186295 0
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I d'like to combine a UILongPressGestureRecognizer with a UIPanGestureRecognizer.

The UIPanGestureRecognizer should start with a long press. Is there a simple way to do this? or do I really have to write my own gesture recognizer?

I wan't something like on the home screen. You press on an icon and after some time the icons start wobbling. Afterwards without releasing my finger from the screen I can start dragging the icon under my finger around.

uilongpressgesturerecogni uipangesturerecognizer uigesturerecognizer objective-c cocoa-touch
7 Answers

For combinate more gesture :

  1. Create a local variable var shouldAllowSecondGesture : Bool = false
  2. Create the two recognizer

let longPressRec = UILongPressGestureRecognizer(target: self, action: #selector(self.startDrag(sender:))) cell.addGestureRecognizer(longPressRec) let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(self.handlePan(sender:))) cell.isUserInteractionEnabled = true cell.addGestureRecognizer(panGestureRecognizer)

  1. Extension your VC and implement GestureRecognizerDelegate for implemented this method.

    extension YourViewController : UIGestureRecognizerDelegate {

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }



func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
         // We only allow the (drag) gesture to continue if it is within a long press
         if((gestureRecognizer is UIPanGestureRecognizer) && (shouldAllowPan == false)) {
             return false
         }
         return true
    }


@objc func startDrag(sender:UIPanGestureRecognizer) {

    if(sender.state == .began) {
            // handle the long press
        }
    else if(sender.state == .changed){
            shouldAllowPan = true

        }
        else if (sender.state == .ended) {
            shouldAllowPan = false
        }
    }
user_13815340

I solved this issue by implementing the desired functionality of the "action: Selector?" func of the UIPanGestureRecognizer within the "action: Selector?" func for the UILongPressGestureRecognizer.

As 'UILongPressGestureRecognizer' has no member 'translation', I calculated the translation by saving the position of the original touch and them extracting it from the actual touch position.


// in target class
var initialTouchX : CGFloat
var initialTouchX : CGFloat


// in the @objc func for the UILongPressGestureRecognizer
if sender.state == .began {
   initialTouchX = sender.location(in: sender.view).x
   initialTouchY = sender.location(in: sender.view).y
}

let translation = CGVector(dx: sender.location(in: sender.view).x - initialTouchX, dy: sender.location(in: sender.view).y - initialTouchY)
user_97181400
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