我正在尝试使用开源框架BWWWalkthroughController(链接:https://github.com/ariok/BWWalkthrough)为我的iOS应用程序创建自定义演练，但我无法让它工作!这是发生错误的类:importUIKitclassStartPageViewController:UIViewController,BWWalkthroughViewControllerDelegate{overridefuncviewDidLoad(){super.viewDidLoad()}overridefuncviewDidAppear(animated:Bool){su