我正试图创建一个屏幕时间应用程序与Flutter，应该能够阻止某些应用程序和限制手机使用。苹果有一个API，可以做到这一点。（https://developer.apple.com/videos/play/wwdc2022/110336/）但我就是不能让它与我的flutter应用程序一起工作。我已经能够弄清楚如何将我的main.dart脚本连接到原生iOS端，尽管我仍然无法将来自.swift脚本的打印消息显示到终端。下面是我的AppDelegate.swift文件中的代码：

import UIKit
import SwiftUI
import Flutter
import ManagedSettings
import FamilyControls

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {

    let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
    let batteryChannel = FlutterMethodChannel(name: "samples.flutter.dev/nativeAPI", binaryMessenger: controller.binaryMessenger)

    let center = AuthorizationCenter.shared

    Task {
      do {
        try await center.requestAuthorization(for: .individual)
      } catch {
        print("Failed requestAuthorization error: \(error)")
      }
    }

    batteryChannel.setMethodCallHandler({
      (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
      switch call.method {
      case "getDate":
        result(self.getDate())
      case "getBatteryLevel":
        guard let args = call.arguments as? [String: String] else {return}
        let name = args["name"]!

        var systemVersion = UIDevice.current.systemVersion

        result(systemVersion)
      default:      
        result(FlutterMethodNotImplemented)
      }
    })

    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }

  private func getDate() -> String {
    let date = Date()
    let calendar = Calendar.current
    let hour = calendar.component(.hour, from: date)
    let minutes = calendar.component(.minute, from: date)
    let seconds = calendar.component(.second, from: date)

    return String(hour) + ":" + String(minutes) + ":" + String(seconds)
  }

  private func receiveBatteryLevel() -> Int {
    let device = UIDevice.current
    device.isBatteryMonitoringEnabled = true

    if device.batteryState == UIDevice.BatteryState.unknown {
      return -1
    } else {
      return Int(device.batteryLevel * 100)
    }
  }
}

当我在Xcode中运行这段代码时，我得到以下错误消息：
Failed requestAuthorization error: Error Domain=FamilyControls.FamilyControlsError Code=3 "(null)"
有没有一个正确的方法来做到这一点，或者是不可能配对的两个？或者我必须注册一个苹果开发者帐户并使用该帐户登录才能访问此API？
我不知道从哪里开始，我没有尝试过任何其他的东西。遗憾的是，我无法将我的应用程序加载到苹果设备上，因为我正在使用macincloud进行开发，而且还没有购买开发者帐户，因为我不确定这个概念是否可行。