如何在Swift原生代码中调用Flutter中的参数？

import 'package:flutter/services.dart';

// 定义一个MethodChannel
final MethodChannel channel = MethodChannel('com.example.channelName');

import Flutter

// 获取到MethodChannel实例
let channel = FlutterMethodChannel(name: "com.example.channelName", binaryMessenger: flutterViewController.binaryMessenger)

channel.invokeMethod("methodName", arguments: "参数值") { (result) in
    // 处理Flutter返回的结果
    if let result = result as? String {
        print(result)
    }
}

channel.setMethodCallHandler((call) async {
  if (call.method == "methodName") {
    String argument = call.arguments as String;
    // 处理参数并返回结果
    return "处理后的结果";
  }
  return null;
});