uinavigationbar - 推送ios13时导航栏高度降低

Question

当我在制作 navigationbar.ishidden = false 后移动到视图控制器时，导航栏高度减小并且导航栏和 uiview 之间有一个黑色空间当我向下移动通知屏幕时，导航栏高度增加

代码

viewController = PlaceOrderViewController(nibName: "PlaceOrderViewController", bundle: nil) 
viewController.hidesBottomBarWhenPushed = true 
viewController.navigationController?.isNavigationBarHidden = false 
viewController.modalPresentationStyle = .fullScreen 
viewController.fromLastScreen = "ProductDetailViewController" 
self.navigationController?.pushViewController(viewController, animated: true)