迁移UIWebView-'NavigationType'不是其成员类型

Question

我试图将旧代码转换为新

我有以下代码，我无法弄清楚如何转换为新类，它给了我错误

“ NavigationType”不是“ WKWebView”的成员类型

 //this function must be replaced 
extension MessagesListViewController: UIWebViewDelegate {
    func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebView.NavigationType) -> Bool {
        if let url = request.url {
            if url.absoluteString.contains(".mp4") || url.absoluteString.contains(".png")
            {
                if self.delegate != nil {
                    self.delegate?.userDidTapLink(urlRequest: request)
                }
                return false
            }
        }
        return true
    }
}

其他功能

 //this function must be replaced 
   func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebView.NavigationType) -> Bool {
    if (request.url != nil && request.url!.absoluteString.contains("cancelAndReturn=true")) {
        self.navigationController?.popViewController(animated: true)
        return false
    }

    if (request.url != nil && request.url!.absoluteString.contains("marry://app")) {
        self.navigationController?.popViewController(animated: true)
        return false
    }

    return true
}