QR Code Rate of recognition AVCamBarcode vs. CodeScanner

[ralfebert]

The Apple example project AVCamBarcode (https://developer.apple.com/documentation/avfoundation/capture_setup/avcambarcode_detecting_barcodes_and_faces) seems to do a few tricks to improve recognition of QR codes and seems to recognize small codes significantly better than CodeScanner.

A starting point could be the CameraViewController#setRecommendedZoomFactor method in the example project. But I am not sure if this is what makes the difference / there might be something else that improves the rate of recognition here – the example project doesn't use CIDetector at all.

Unfortunately I have no more time to investigate this further, the solution for my client will probably be "print bigger QR codes", just wanted to document our findings here.

[karolbielski]

I opened PR #127 that applies zoom factor and chooses wide angle camera if possible.