cb_prestige_qr/ios/Runner/AppDelegate.swift

import Flutter
import UIKit

@main
@objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
  private let deviceChannelName = "cb_prestige_qr/device"

  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }

  func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
    GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)

    let channel = FlutterMethodChannel(
      name: deviceChannelName,
      binaryMessenger: engineBridge.binaryMessenger
    )
    channel.setMethodCallHandler { call, result in
      switch call.method {
      case "getDeviceId":
        if let identifier = UIDevice.current.identifierForVendor?.uuidString,
           !identifier.isEmpty {
          result(identifier)
        } else {
          result(
            FlutterError(
              code: "device_id_unavailable",
              message: "Unable to retrieve device ID.",
              details: nil
            )
          )
        }
      default:
        result(FlutterMethodNotImplemented)
      }
    }
  }
}