Вы можете использовать weakdelegate
public partial class xxxViewController : UIViewController,IQLPreviewControllerDelegate,IQLPreviewControllerDataSource
//. . .
в методе OpenDocument
public void OpenDocument()
{
var previewViewController = new QLPreviewController();
previewViewController.View.Frame = View.Bounds;
previewViewController.WeakDelegate = this;
previewViewController.WeakDataSource = this;
this.PresentViewController(previewViewController, true,null);
}
И переопределить метод в QLPreviewControllerDelegate
и QLPreviewControllerDataSource
public nint PreviewItemCount(QLPreviewController controller)
{
return 1;
}
public IQLPreviewItem GetPreviewItem(QLPreviewController controller, nint index)
{
return new NSUrl("your url");
}
[Export("previewController:shouldOpenURL:forPreviewItem:")]
public bool ShouldOpenUrl(QLPreviewController controller, NSUrl url, IQLPreviewItem item)
{
Console.WriteLine("PreviewControllerDelegate::ShouldOpenUrl: {0}", url.AbsoluteString);
return true;
}
[Export("previewControllerWillDismiss:")]
public void WillDismiss(QLPreviewController controller)
{
// do some thing
}
Я использую приведенный выше код, и он отлично работает.