 // the two views offscreen. The transition animates the top and bottom views
 // coming together, as they combine to create the presented view
 public final class OBShutterTransitionDelegateBehavior: OBTransitionDelegateBehavior {
+    @IBInspectable var shutterHeight: CGFloat = .defaultTopHeight
+    
     private var topView: UIImageView?
     private var bottomView: UIImageView?
     private var subviews: [UIView]?

        }
        
        let dataSource: OBShutterTransitionDelegateBehaviorDataSource? = getDataSource()
        let height = dataSource?.topHeight ?? .defaultTopHeight
        
        let (topView, bottomView) = split(view: presentingView, at: height)
        

        }
        
        let dataSource: OBShutterTransitionDelegateBehaviorDataSource? = getDataSource()
        let height = dataSource?.topHeight ?? shutterHeight
        
        (topView, bottomView) = split(view: presentedView, at: height)
        
