         }
     }
     
-    // swizzling system method: updateInteractiveTransition
+    // swizzling system method: _updateInteractiveTransition
     func wr_updateInteractiveTransition(_ percentComplete: CGFloat)
     {
         guard let topViewController = topViewController,

            }
        }
    }
    
    // navigationBar _UIBarBackground alpha
    var navBarBackgroundAlpha:CGFloat {
        get {

    {
        navigationBar.wr_setBackgroundColor(color: barTintColor)
    }

    fileprivate func setNeedsNavigationBarUpdate(barBackgroundAlpha: CGFloat)
    {
        navigationBar.wr_setBackgroundAlpha(alpha: barBackgroundAlpha)
    }

    fileprivate func setNeedsNavigationBarUpdate(tintColor: UIColor) {
        navigationBar.tintColor = tintColor
    }

    fileprivate func setNeedsNavigationBarUpdate(titleColor: UIColor) {
        navigationBar.titleTextAttributes = [NSForegroundColorAttributeName:titleColor]
    }
