如何在flutter中导航到iOS原生添加联系人页面？

dependencies:
  contacts_service: ^0.4.6

import 'package:contacts_service/contacts_service.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/services.dart';

void navigateToAddContactPage() {
  if (Theme.of(context).platform == TargetPlatform.iOS) {
    // 使用MethodChannel调用iOS原生方法打开添加联系人页面
    const platform = MethodChannel('your_channel_name');
    try {
      // 调用iOS原生方法打开添加联系人页面
      platform.invokeMethod('openAddContactPage');
    } on PlatformException catch (e) {
      print("Failed to open add contact page: '${e.message}'.");
    }
  } else {
    // 在Android设备上可以使用contacts_service插件打开添加联系人页面
    ContactsService.openContactForm();
  }
}

import ContactsUI
import Flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  private static let CHANNEL = "your_channel_name"

  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
    let contactChannel = FlutterMethodChannel(name: AppDelegate.CHANNEL, binaryMessenger: controller.binaryMessenger)
    contactChannel.setMethodCallHandler({
      (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
      if ("openAddContactPage" == call.method) {
        self.openAddContactPage()
      } else {
        result(FlutterMethodNotImplemented)
      }
    })

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

  private func openAddContactPage() {
    let contactViewController = CNContactViewController(forNewContact: nil)
    let navigationController = UINavigationController(rootViewController: contactViewController)
    let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
    controller.present(navigationController, animated: true, completion: nil)
  }
}