The camera isn't working when the DocumentScannerViewController doesn't calling viewDidLoad()

[Idomo]

When half closing the DocumentScannerViewController and then open it again (with swipe gesture), the camera won't work, it just freezes and not responding.
Note that when you do so it won't call viewDidLoad() and won't initialize the camera and the detector.

Do you have any suggestion how to fix this so even if the user started to dismiss the DocumentScannerViewController and regretted it won't make the camera freeze and etc.?

Thanks,
Ido.