Xamarin.ios -在web视图中显示PDF时的上一步/完成按钮

using System;
using UIKit;
using Foundation;
using WebKit;

namespace YourNamespace
{
    public class PDFViewController : UIViewController
    {
        private WKWebView webView;

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            // 创建WebView
            webView = new WKWebView(View.Bounds, new WKWebViewConfiguration());
            View.AddSubview(webView);

            // 加载PDF文件
            var pdfUrl = new NSUrl("https://example.com/path/to/pdf.pdf");
            var request = new NSUrlRequest(pdfUrl);
            webView.LoadRequest(request);

            // 添加导航栏
            var navigationBar = new UINavigationBar(new CoreGraphics.CGRect(0, 0, View.Frame.Width, 44));
            var navigationItem = new UINavigationItem("PDF Viewer");
            var backButton = new UIBarButtonItem("上一步", UIBarButtonItemStyle.Plain, GoBack);
            var doneButton = new UIBarButtonItem("完成", UIBarButtonItemStyle.Done, Complete);
            navigationItem.LeftBarButtonItem = backButton;
            navigationItem.RightBarButtonItem = doneButton;
            navigationBar.Items = new[] { navigationItem };
            View.AddSubview(navigationBar);
        }

        private void GoBack(object sender, EventArgs e)
        {
            // 返回上一步
            NavigationController.PopViewController(true);
        }

        private void Complete(object sender, EventArgs e)
        {
            // 完成操作
            // TODO: 添加完成操作的逻辑
        }
    }
}