Choosing suitable camera for barcode scanning when using AVCaptureDeviceTypeBuiltInTripleCamera-CodePudding

I've had some barcode scanning code in my iOS app for many years now. Recently, users have begun complaining that it doesn't work with an iPhone 13 Pro.

During investigation, it seemed that I should be using the built in triple camera if available. Doing that did fix it for iPhone 13 Pro but subsequently broke it for iPhone 12 Pro, which seemed to be working fine with the previous code.

How are you supposed to choose a suitable camera for all devices? It seems bizarre to me that Apple has suddenly made it so difficult to use this previously working code.

Here is my current code. The "fallback" section is what the code has used for years.

     _session = [[AVCaptureSession alloc] init];
     // Must use macro camera for barcode scanning on newer devices, otherwise the image is blurry
    if (@available(iOS 13.0, *)) {
        AVCaptureDeviceDiscoverySession * discoverySession =
        [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:@[AVCaptureDeviceTypeBuiltInTripleCamera]
                                                               mediaType:AVMediaTypeVideo
                                                                position:AVCaptureDevicePositionBack];
        if (discoverySession.devices.count == 0) {
            // no BuiltInTripleCamera
            _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
        } else {
            _device = discoverySession.devices.firstObject;
        }
    } else {
        // Fallback on earlier versions
        _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    }

CodePudding user response：

Thankfully with the help of reddit I was able to figure out that the solution is simply to replace

AVCaptureDeviceTypeBuiltInTripleCamera

with

AVCaptureDeviceTypeBuiltInWideAngleCamera