AVCamBarcode.CameraViewController.CreateMetadataOverlay C# (CSharp) Метод

		MetadataObjectLayer CreateMetadataOverlay (AVMetadataObject metadataObject)
		{
			// Transform the metadata object so the bounds are updated to reflect those of the video preview layer.
			var transformedMetadataObject = PreviewView.VideoPreviewLayer.GetTransformedMetadataObject (metadataObject);

			// Create the initial metadata object overlay layer that can be used for either machine readable codes or faces.
			var metadataObjectOverlayLayer = new MetadataObjectLayer {
				MetadataObject = transformedMetadataObject,
				LineJoin = CAShapeLayer.JoinRound,
				LineWidth = 7,
				StrokeColor = View.TintColor.ColorWithAlpha (0.7f).CGColor,
				FillColor = View.TintColor.ColorWithAlpha (0.3f).CGColor
			};

			var barcodeMetadataObject = transformedMetadataObject as AVMetadataMachineReadableCodeObject;
			if (barcodeMetadataObject != null) {
				var barcodeOverlayPath = BarcodeOverlayPathWithCorners (barcodeMetadataObject.Corners);
				metadataObjectOverlayLayer.Path = barcodeOverlayPath;

				// If the metadata object has a string value, display it.
				if (barcodeMetadataObject.StringValue.Length > 0) {
					var barcodeOverlayBoundingBox = barcodeOverlayPath.BoundingBox;

					var font = UIFont.BoldSystemFontOfSize (19).ToCTFont ();
					var textLayer = new CATextLayer {
						AlignmentMode = CATextLayer.AlignmentCenter,
						Bounds = new CGRect (0, 0, barcodeOverlayBoundingBox.Size.Width, barcodeOverlayBoundingBox.Size.Height),
						ContentsScale = UIScreen.MainScreen.Scale,
						Position = new CGPoint (barcodeOverlayBoundingBox.GetMidX (), barcodeOverlayBoundingBox.GetMidY ()),
						Wrapped = true,

						// Invert the effect of transform of the video preview so the text is orientated with the interface orientation.
						Transform = CATransform3D.MakeFromAffine (PreviewView.Transform).Invert (default (CATransform3D)),
						AttributedString = new NSAttributedString (barcodeMetadataObject.StringValue, new CTStringAttributes {
							Font = font,
							ForegroundColor = UIColor.White.CGColor,
							StrokeWidth = -5,
							StrokeColor = UIColor.Black.CGColor
						})
					};
					textLayer.SetFont (font);
					metadataObjectOverlayLayer.AddSublayer (textLayer);
				}
			} else if (transformedMetadataObject is AVMetadataFaceObject) {
				metadataObjectOverlayLayer.Path = CGPath.FromRect (transformedMetadataObject.Bounds);
			}
			return metadataObjectOverlayLayer;
		}