你也应该实现存根，比如：

struct PageViewController<Page: View>: UIViewControllerRepresentable {
    typealias UIViewControllerType = UIViewController // <- Choose the correct controller

    func makeUIViewController(context: Context) -> UIViewControllerType {
        // Implement As needed
    }

    func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {
        // Implement As needed
    }

    var pages: [Page]
}