如何调用原生IOS中的方法向Flutter发送数据？

import 'package:flutter/services.dart';

const platform = const MethodChannel('com.example.app/channel');

// 发送数据给原生iOS
Future<void> sendDataToiOS(String data) async {
  try {
    await platform.invokeMethod('sendDataToiOS', {'data': data});
  } catch (e) {
    print(e);
  }
}

// 接收来自原生iOS的数据
void receiveDataFromiOS() {
  platform.setMethodCallHandler((call) async {
    if (call.method == 'receiveDataFromiOS') {
      String data = call.arguments['data'];
      // 处理接收到的数据
    }
  });
}

import Flutter
import UIKit

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
    let channel = FlutterMethodChannel(name: "com.example.app/channel", binaryMessenger: controller.binaryMessenger)
    
    channel.setMethodCallHandler { [weak self] (call, result) in
      if call.method == "sendDataToiOS" {
        if let data = call.arguments as? [String: Any],
           let dataToSend = data["data"] as? String {
          self?.sendDataToFlutter(data: dataToSend)
        }
      }
    }
    
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
  
  private func sendDataToFlutter(data: String) {
    let channel = FlutterMethodChannel(name: "com.example.app/channel", binaryMessenger: self.window.rootViewController as! FlutterViewController)
    channel.invokeMethod("receiveDataFromiOS", arguments: ["data": data])
  }
}