AVCamBarcode.CameraViewController.ViewWillAppear C# (CSharp) Метод

		public override void ViewWillAppear (bool animated)
		{
			base.ViewWillAppear (animated);

			sessionQueue.DispatchAsync (() => {
				switch (setupResult) {
				case SessionSetupResult.Success:
					// Only setup observers and start the session running if setup succeeded.
					AddObservers ();
					session.StartRunning ();
					sessionRunning = session.Running;
					break;

				case SessionSetupResult.NotAuthorized:
					DispatchQueue.MainQueue.DispatchAsync (() => {
						var message = "AVCamBarcode doesn't have permission to use the camera, please change privacy settings";
						var alertController = UIAlertController.Create ("AVCamBarcode", message, UIAlertControllerStyle.Alert);
						alertController.AddAction (UIAlertAction.Create ("OK", UIAlertActionStyle.Cancel, null));
						alertController.AddAction (UIAlertAction.Create ("Settings", UIAlertActionStyle.Default, action => {
							UIApplication.SharedApplication.OpenUrl (new NSUrl (UIApplication.OpenSettingsUrlString));
						}));
						PresentViewController (alertController, true, null);
					});
					break;

				case SessionSetupResult.ConfigurationFailed:
					DispatchQueue.MainQueue.DispatchAsync (() => {
						var message = "Unable to capture media";
						var alertController = UIAlertController.Create ("AVCamBarcode", message, UIAlertControllerStyle.Alert);
						alertController.AddAction (UIAlertAction.Create ("OK", UIAlertActionStyle.Cancel, null));
						PresentViewController (alertController, true, null);
					});
					break;
				}
			});
		}