class DragImages: UIImageView {

    var originalPos : CGPoint!
    var dropTarget: UIView?
    //var endPos : CGPoint!
//    var endPosX : CGFloat
//    var endPosY : CGFloat

    override init (frame : CGRect){
        super.init(frame: frame)
    }

    required init?(coder aDecoder : NSCoder){
        super.init(coder : aDecoder)
    }

    override func touchesBegan(_ touches : Set<UITouch>,with event: UIEvent?){
        originalPos = self.center
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first{
            let position = touch.location(in: self.superview)
            self.center = CGPoint(x : position.x, y : position.y)
        }
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {

        if let touch = touches.first, let target = dropTarget{
            let position = touch.location(in: self.superview)
            if target.frame.contains(position){

               NotificationCenter.default.post(Notification(name: Notification.Name(rawValue: "onTargetDropped"), object: nil))
            }else {
                self.center = originalPos
            }
        }

        print(self.center.x, self.center.y)
        self.center = originalPos
    }

    func getEndPosX() -> CGFloat{
        return self.center.x
    }

    func getEndPosY() -> CGFloat {
        return self.center.y
    }

    }

ornament1.dropTarget = xmasTree
    ornament2.dropTarget = xmasTree
    ornament3.dropTarget = xmasTree
    ornament4.dropTarget = xmasTree

NotificationCenter.default.addObserver(self, selector: #selector(ViewController.itemDroppedOnTree(_:)), name: NSNotification.Name(rawValue: "onTargetDropped"), object: nil)

}


func itemDroppedOnTree(_ notif : AnyObject){



     }