Flutter用户通道通信插件flutter_user_channel的使用

该插件主要用于Flutter与原生应用（Android和iOS）混合开发时（通常配合flutter_boost一起使用），在原生应用中更新Flutter中的用户令牌和其他信息。

开始使用

在Flutter中使用

首先，需要导入插件并监听原生传递过来的信息：

import 'package:flutter_user_channel/flutter_user_channel.dart';

void main() {
  /// 监听原生传递过来的token
  FlutterUserChannel.listenUserToken(
    (p0) {
      var completer = Completer();
      print("============ 接收到的user token $p0");
      // 这里写数据的处理
      if (p0 == null) {
        completer.complete("========== 接收到user token 为空，已经退出登录");
      } else {
        completer.complete("========== 接收到user token $p0");
      }
      return completer.future;
    },
  );

  /// 监听原生传递过来的其它信息
  FlutterUserChannel.listenOtherInfo(
    (p0) {
      var completer = Completer();
      print("============ 接收到的数据 $p0");
      // 这里写数据的处理
      completer.complete("========== 已经接收到数据 $p0");
      return completer.future;
    },
  );
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  final _flutterUserChannelPlugin = FlutterUserChannel();

  @override
  void initState() {
    super.initState();
    initPlatformState();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    // try {
    //   platformVersion =
    //       await _flutterUserChannelPlugin.getPlatformVersion() ?? 'Unknown platform version';
    // } on PlatformException {
    //   platformVersion = 'Failed to get platform version.';
    // }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      // _platformVersion = platformVersion;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          child: Text('Running on: $_platformVersion\n'),
        ),
      ),
    );
  }
}

在iOS中使用

在iOS中，我们需要配置FlutterEngine并调用相关的方法来更新用户令牌和传递其他信息：

import flutter_boost
import flutter_user_channel

class AppDelegate: UIResponder, UIApplicationDelegate {
    // 创建代理，做初始化操作
    var flutterBoostDelegate = GMFlutterBoostDelegate()
    var flutterEngine: FlutterEngine?
    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // ...
        // 配置Flutter
        configFlutterBoost(application)
        // 向flutter同步token
        let token = "token"
        updateUserTokenInFlutter(token)
        return true
    }
}

extension AppDelegate {
    /// 设置flutter
    func configFlutterBoost(_ application: UIApplication) {
        let boostDelegate = GMFlutterBoostDelegate()
        flutterBoostDelegate = boostDelegate
        FlutterBoost.instance().setup(application, delegate: flutterBoostDelegate) {[weak self] engine in
            self?.flutterEngine = engine
        }
    }
}

extension AppDelegate {
    /// 更新flutter中的token
    func updateUserTokenInFlutter(_ token: String?) {
        guard let flutterEngine = flutterEngine else { return }
        FlutterUserChannel.updateUserToken(with: token, engine: flutterEngine) {[weak self] result in
            print("============updateUserToken \(String(describing: result))")
        }
    }

    /// 传递数据到flutter
    func transmitOtherInfoToFlutter(_ value: [String : Any]) {
        guard let flutterEngine = flutterEngine else { return }
        FlutterUserChannel.transmitOtherInfo(with: value, engine: flutterEngine) { result in
            print("============transmitOtherInfo \(String(describing: result))")
        }
    }
}

在Android中使用

在Android中，使用的类和方法与iOS相同。我们可以通过调用updateUserToken和transmitOtherInfo方法来更新用户令牌和传递其他信息：

// 由于示例代码中没有提供具体的Android代码实现，这里仅展示方法签名。
// 实际使用时可以参照iOS代码进行相应的实现。