Hi Alain,
Please check out the updated versions of the classes which are in iOSKit. The relevant example view is the BarcodeScannerView.
You can find it here:
https://github.com/kingj5/iOSKit
Jason
PS the classes you are trying do actually work, but they require an incredibly clear picture with the code centered in the middle. The new classes using AVFoundation work on the fly and do not require as clear of a picture so they are significantly better to use, although require more setup which is shown in the example.