public void ShowDocumentViewController()
{
var cameraViewController = new VNDocumentCameraViewController
{
Delegate = this
};
PresentViewController(cameraViewController, true, null);
}
public void DidFinish(VNDocumentCameraViewController controller, VNDocumentCameraScan scan)
{
var pageCount = (int)scan.PageCount;
var allItems = new List <List <string> >();
for (int i = 0; i < pageCount; i++)
{
var image = scan.GetImage(nuint.Parse(i.ToString()));
var imageRequestHandler = new VNImageRequestHandler(image.CGImage, options: new NSDictionary());
var textRequest = new VNRecognizeTextRequest(new VNRequestCompletionHandler((request, error) =>
{
var results = request.GetResults <VNRecognizedTextObservation>();
foreach (var result in results)
{
var items = new List <string>();
foreach (var candidate in result.TopCandidates(100))
{
items.Add(candidate.String);
}
allItems.Add(items);
}
Device.BeginInvokeOnMainThread(() =>
{
_page.LoadRecognizedTextItems(allItems);
DismissViewController(true, null);
});
}));
switch (_page.TextRecognitionLevel)
{
case TextRecognitionLevelEnum.Accurate:
textRequest.RecognitionLevel = VNRequestTextRecognitionLevel.Accurate;
break;
case TextRecognitionLevelEnum.Fast:
textRequest.RecognitionLevel = VNRequestTextRecognitionLevel.Fast;
break;
default:
break;
}
textRequest.UsesLanguageCorrection = true;
DispatchQueue.DefaultGlobalQueue.DispatchAsync(() =>
{
imageRequestHandler.Perform(new VNRequest[] { textRequest }, out NSError error);
});
}
}
public override void ViewDidAppear(bool animated)
{
var documentCameraController = new VNDocumentCameraViewController();
var documentscanDelegate = new DocumentScanDelegate();
documentscanDelegate.OnScanTaken += (VNDocumentCameraScan scan) =>
{
documentCameraController.DismissViewController(true, null);
Debug.WriteLine($"{scan.PageCount} Pages!");
};
documentscanDelegate.OnCanceled += () =>
{
documentCameraController.DismissViewController(true, null);
};
documentCameraController.Delegate = documentscanDelegate;
documentCameraController.ModalPresentationStyle = UIModalPresentationStyle.OverFullScreen;
PresentViewController(documentCameraController, true, null);
}
public void DidCancel(VNDocumentCameraViewController controller)
{
DismissViewController(true, null);
}
public override void DidFail(VNDocumentCameraViewController controller, NSError error)
{
Debug.WriteLine("Failed scanning photo");
}
public override void DidFinish(VNDocumentCameraViewController controller, VNDocumentCameraScan scan)
{
Debug.WriteLine("DocumentScanDelegate:DidFinish");
OnScanTaken(scan);
}
public override void DidCancel(VNDocumentCameraViewController controller)
{
Debug.WriteLine("DocumentScanDelegate:DidCancel");
OnCanceled();
}