 
 import UIKit
 
-class DropItViewController: UIViewController {
+class DropItViewController: UIViewController, UIDynamicAnimatorDelegate {
 
     @IBOutlet weak var gameView: UIView!
     

                }
        
            }
        }while dropsToRemove.count == 0 && dropFrame.origin.y > 0
        for drop in dropsToRemove{
            dropitBehavior.removeDrop(drop)

    // Do not call this before self.gameView is set
    lazy var animator: UIDynamicAnimator = {
       let lazilyCreatedDynamicAnimator = UIDynamicAnimator(referenceView: self.gameView)
        lazilyCreatedDynamicAnimator.delegate = self
        return lazilyCreatedDynamicAnimator
    }()
    
