Question

I am using this app to scan ZXING barcodes:

https://github.com/jmawebtech/BarcodeReader-MonoTouch

If I enter the application, scan a barcode, press the home button, re-enter the app, and click scan, I see a black screen that looks like a camera shutter never opens. I have attached an image to this ticket.

If I press cancel, and go back to scan I see the camera open again.

How come the camera never opens on some occasions?

Answer 1

I had to add this code to Info.plist:

UIApplicationExitsOnSuspend YES

To App Delegate, I had to add this code:

    public override void OnResignActivation (UIApplication application)
    {
        UIApplication.SharedApplication.PerformSelector(new Selector("terminateWithSuccess"), null, 0f);
    }

The video recorder, which was used in this software, cannot run on a background thread.