如何将obj-c NSDictionary传递给dart

import 'package:flutter/services.dart';

// 创建MethodChannel对象
MethodChannel _channel = MethodChannel('com.example.channel');

// 将NSDictionary传递给原生平台
void passNSDictionaryToNative(NSDictionary dictionary) async {
  try {
    await _channel.invokeMethod('passNSDictionaryToNative', dictionary);
  } catch (e) {
    print('Error: $e');
  }
}

#import <Flutter/Flutter.h>

// 注册MethodChannel
FlutterMethodChannel *channel = [FlutterMethodChannel
    methodChannelWithName:@"com.example.channel"
          binaryMessenger:[registrar messenger]];

// 实现接收NSDictionary的方法
[channel setMethodCallHandler:^(FlutterMethodCall *call, FlutterResult result) {
  if ([@"passNSDictionaryToNative" isEqualToString:call.method]) {
    NSDictionary *dictionary = call.arguments;
    // 处理接收到的NSDictionary
    // ...
    result(nil); // 返回结果给Flutter
  } else {
    result(FlutterMethodNotImplemented);
  }
}];