Scan Process

class YourViewController: UIViewController, ScannerViewControllerHolder {

    // Implement the properties defined by the ScannerViewControllerHolder interface
    var scannerViewController: UIViewController?

    var dismissViewController: (() -> Void)?

    // Rest of your class implementation...
}

if (TireTreadScanner.companion.instance.captureDistanceStatus == DistanceStatus.ok)
{
    TireTreadScanner.companion.instance.startScanning()
}
else {
    // Notify user to move the phone to the correct position before starting
    print("Move the phone to the correct position before starting")
}

extension YourViewController {

    private func onError(measurementUUID: String?, exception: Exception) {
        print("onUploadFailed")
        self.displayError()
    }

    private func onScanAborted(measurementUUID: String?) {
        TireTreadScanner.companion.abortScanning()
        finish()
    }

    private func onScanProcessCompleted(measurementUUID: String) {
        print("onUploadCompleted")
        if let safeUuid = event.measurementUUID {
            // redirect to the result loading screen
            self.displayLoading(uuid: safeUuid)
        } else {
            self.displayError()
        }
    }

    private func handleScanEvent(event: ScanEvent) {
        switch(event) {

        case let event as OnImageUploaded:
            print("onImageUploaded: \(event.total) images uploaded in total")
            break

        case event as OnDistanceChanged:
            self.onDistanceChanged(event.measurementUUID, event.previousStatus, event.newStatus, event.previousDistance, event.newDistance)
            break
        default:
            print("ScanEvent: \(event.description)")
            break
        }
    }

    func startScanning() {
        TireTreadScanner.companion.startScanning()
    }

    func stopScanning() {
        TireTreadScanner.companion.stopScanning()
    }

    /// When not using the "default UI", use this callback to provide guidance to the users
    /// Called when the distance has changed.
    ///
    /// - Parameters:
    ///   - uuid: The UUID associated with the distance change.
    ///   - previousStatus: The previous distance status.
    ///   - newStatus: The new distance status.
    ///   - previousDistance: The previous distance value.
    ///   - newDistance: The new distance value.
    ///
    /// Note: The distance values are provided in millimeters if the metric system is selected (`UserDefaultsManager.shared.imperialSystem = false`), and in inches if the imperial system is selected (`UserDefaultsManager.shared.imperialSystem = true`).
    private func onDistanceChanged(uuid: String?, previousStatus: DistanceStatus, newStatus: DistanceStatus, previousDistance: Float, newDistance: Float) {
        if Int(newDistance) != Int(previousDistance) {
            let distanceInCentimeters = UserDefaultsManager.shared.imperialSystem ? (newDistance * 2.54) : (newDistance / 10.0)
            DispatchQueue.main.async { [weak self] in
                self?.updateUI(status: newStatus, distance: Int(UserDefaultsManager.shared.imperialSystem ? newDistance : distanceInCentimeters))
            }
        }
    }
}