AVCam.CameraViewController.ViewWillAppear C# (CSharp) Method

		public override void ViewWillAppear (bool animated)
		{
			base.ViewWillAppear (animated);
			sessionQueue.DispatchAsync (() => {
				switch (setupResult) {
				// Only setup observers and start the session running if setup succeeded.
				case AVCamSetupResult.Success:
					AddObservers ();
					session.StartRunning ();
					sessionRunning = session.Running;
					break;

				case AVCamSetupResult.CameraNotAuthorized:
					DispatchQueue.MainQueue.DispatchAsync (() => {
						string message = "AVCam doesn't have permission to use the camera, please change privacy settings";
						UIAlertController alertController = UIAlertController.Create ("AVCam", message, UIAlertControllerStyle.Alert);
						UIAlertAction cancelAction = UIAlertAction.Create ("OK", UIAlertActionStyle.Cancel, null);
						alertController.AddAction (cancelAction);
						// Provide quick access to Settings.
						alertController.AddAction (UIAlertAction.Create ("Settings", UIAlertActionStyle.Default, action => {
							UIApplication.SharedApplication.OpenUrl (new NSUrl (UIApplication.OpenSettingsUrlString), new NSDictionary (), null);
						}));
						PresentViewController (alertController, true, null);
					});
					break;

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