我正在将一个自定义iOS插件集成到我的Flutter应用程序中，问题是我没有从自定义SDK协议中获得委托回调。
我必须将蓝牙设备连接到我的应用程序，我从代表呼叫中接收设备的ID并配对。
在Flutter端，我可以从customSdk调用本地函数：sdkInstance.scan()，甚至有一些内部（在sdk内部）打印扫描结果，但我的委托调用没有到位。
我想我没有正确地将委托添加到SDK中，我可以让它在swift原生应用中工作，但不能作为Flutter插件。
下面是大致的代码：

iOS代码

AppDelegate.swift

import UIKit
import Flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

SwiftIosPlugin.swift

import Flutter
import UIKit
import CustomSDK

public class SwiftIosPlugin: NSObject, FlutterPlugin {

    let sdkInstance = CustomSDK.shared // This returns an instance of the SDK
    let channel: FlutterMethodChannel

    public static func register(with registrar: FlutterPluginRegistrar) 
      let channel = FlutterMethodChannel(name: "ios_plugin_channel", binaryMessenger: registrar.messenger())
      let instance = SwiftIosPlugin(channel)

      registrar.addMethodCallDelegate(instance, channel: channel)
      registrar.addApplicationDelegate(instance)
    }

    init (_ channel: FlutterMethodChannel) {
      self.channel = channel
      super.init()
      // In Swift, this is done in viewDidLoad()
      // Is this the correct place to do this?
      sdkInstance.addDelegate(self)

    }

public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
      switch call.method {
        case "startScan":
         do {
           // This is being called and results printed
           try sdkInstance.scan()
          } catch {
            result(FlutterError(code: "400", message: "\(error)", details: nil))

          }
        case "connect":
            sdkInstance.connect(call, result)
    
        default:
          result(FlutterMethodNotImplemented)
      }
    }
}

// These should be called but are not
extension SwiftIosPlugin: CustomSDKDelegate {
    // Isn't called when scan() is executeed!
    public func onScanDevice(didScan id:String) {
        // do logic
    }

    public func onPairedDevice(didPair id:String) {
        // do logic
    }
}