void UseFaceDetectionModel()
{
var faceDetector = vision.GetFaceDetector();
var image = new VisionImage(ImgSample.Image);
faceDetector.ProcessImage(image, HandleVisionFaceDetectionCallback);
void HandleVisionFaceDetectionCallback(VisionFace [] faces, NSError error)
{
if (error != null)
{
TxtData.Text = error.Description;
return;
}
if (faces == null || faces.Length == 0)
{
TxtData.Text = "No faces were found.";
return;
}
var imageSize = ImgSample.Image.Size;
UIGraphics.BeginImageContextWithOptions(imageSize, false, 0);
var context = UIGraphics.GetCurrentContext();
context.SetStrokeColor(UIColor.Red.CGColor);
context.SetLineWidth(10);
ImgSample.Image.Draw(CGPoint.Empty);
foreach (var face in faces)
{
context.AddRect(face.Frame);
context.DrawPath(CGPathDrawingMode.Stroke);
}
var newImage = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
ImgSample.Image = newImage;
}
}