Auto Focus Change Camera or Select Camera

[adam1st]

I am making an ingredient scanning app using WeScan and everything is complete however I was testing on an older iPhone with only 1 rear camera. After testing on an iPhone 15 I have realised the rear camera is not auto focusing and I can't see in the library where to define either which camera to use (it needs the closest vision one for scanning small text up close) or how to make it auto focus (eg like in the native camera app you tap to auto focus and it will swap to the appropriate camera).

I have been playing around with the ImageScannerController and CameraScannerViewController to no avail trying to find an autoFocus or selectCamera method, any suggestions? Thanks

[adam1st]

I have fixed it, putting this here for others who have the same issue or hoping contributors could possibly add this as a function of the app to chose which lens to use.

1. I downloaded a local copy of the git
2. In Xcode I removed the dependency on the package from git (Click on the main blue project icon, package dependencies, WeScan, and clicked - )
3. Added the package dependancy based on the local copy (so I could alter the files of the package) - XCode, File, Add Package Depdancy, click Add Local button, browse for the local copy and add
4. The following 4 files were where I found the code is selecting AVCaptureDevice (in Scan and Session folders): CameraScannerViewController, CaptureSessionManager, ScannerViewController, CaptureSession
5. Search for AVCaptureDevice and replace this: guard let device = AVCaptureDevice.default(for: AVMediaType.video) with the following to CameraScannerViewController and ScannerViewController:

let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInTripleCamera, .builtInDualWideCamera, .builtInDualCamera, .builtInWideAngleCamera], mediaType: .video, position: .back)
let selectedDevice = discoverySession.devices.first guard let device = selectedDevice else { return }

8. Add this to CaptureSession:
   let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInTripleCamera, .builtInDualWideCamera, .builtInDualCamera, .builtInWideAngleCamera], mediaType: .video, position: .back)
let selectedDevice = discoverySession.devices.first self.device = selectedDevice

9. And add this to CaptureSessionManager:

let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInTripleCamera, .builtInDualWideCamera, .builtInDualCamera, .builtInWideAngleCamera], mediaType: .video, position: .back)

let selectedDevice = discoverySession.devices.first guard let device = selectedDevice else { let error = ImageScannerControllerError.inputDevice delegate?.captureSessionManager(self, didFailWithError: error) return nil }

Some links I found helpful:

https://teng.pub/technical/2022/6/9/let-ios-decide-the-best-lens-to-use
https://developer.apple.com/documentation/avfoundation/capture_setup/choosing_a_capture_device

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[masimplo]

Is this fix going to be integrated to the codebase at some point? We are facing the same issue and would be nice to not have to fork the repo for this fix.