Swift 无法转换类型为'；MopubBannerAdView'；返回类型'；UIViewController？&x27；

我试图在我的swiftUI应用程序中显示mopubBanner，我正在努力解决我必须在委托中实现的委托方法之一。我不确定是否可以在这里返回viewController

未实现此方法将导致无法单击横幅广告

import MoPub

struct MopubBannerAdView: UIViewControllerRepresentable {

    typealias UIViewControllerType = UIViewController

    func makeUIViewController(context: Context) -> UIViewController {
        return MopubBannerViewController()
    }
    
    func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
        
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    class Coordinator: NSObject, UINavigationControllerDelegate, MPAdViewDelegate {
        
        private let parent: MopubBannerAdView
        
        init(_ mopubView: MopubBannerAdView) {
            self.parent = mopubView
        }
        
        func viewControllerForPresentingModalView() -> UIViewController! {
            return self.parent /// this line here throws the error
        }
    }
}

---

如何才能最好地解决这个问题？

您只需设置演示视图控制器，为此，您可以使用Windows rootVC，例如

  func viewControllerForPresentingModalView() -> UIViewController! {
       return  UIApplication.shared.windows.filter {$0.isKeyWindow}.first?.rootViewController
   }