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")
}

// Implement the TireTreadScanViewCallback interface
extension YourViewController: TireTreadScanViewCallback {

    // These callbacks should always be implemented
    func onScanAbort(uuid: String?) {
        print("scan aborted for uuid: \(uuid ?? "")")
        // Leave the scan activity
        self.navigationController?.popViewController(animated: true)
    }

    func onUploadCompleted(uuid: String?) {
        if let safeUuid = uuid {
            // redirect to the result loading screen
            self.displayLoading(uuid: safeUuid)
        } else {
            self.displayError()
        }
    }

    func onUploadFailed(uuid: String?, exception: KotlinException) {
        self.displayError()
    }

    // When not using the 'default UI', you will need to implement (at least) the following functions to control the scan process

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

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

    func abortScan() {
        TireTreadScanner.companion.abortScanning()
        finish()
    }

    /// 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`).
    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))
            }
        }
    }
}