navigationController.navigationBar.barTintColor = .red //背景色
navigationController.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white] //标题颜色
self.navigationController?.navigationBar.tintColor = UIColor.white //左右按钮文字颜色

UIControl().sendAction(#selector(NSXPCConnection.suspend),
                               to: UIApplication.shared, for: nil)