deepvoice_client/local_plugins/native_plugin/ios/Classes/FLNativeView.swift

import Flutter
import UIKit

@objc(FLNativeViewFactory)
public class FLNativeViewFactory: NSObject, FlutterPlatformViewFactory {
  private let messenger: FlutterBinaryMessenger

  public init(messenger: FlutterBinaryMessenger) {
    self.messenger = messenger
    super.init()
  }

  public func create(
    withFrame frame: CGRect,
    viewIdentifier viewId: Int64,
    arguments args: Any?
  ) -> FlutterPlatformView {
    return FLNativeView(frame: frame, viewIdentifier: viewId, arguments: args, binaryMessenger: messenger)
  }

  public func createArgsCodec() -> FlutterMessageCodec & NSObjectProtocol {
    return FlutterStandardMessageCodec.sharedInstance()
  }
}

public class FLNativeView: NSObject, FlutterPlatformView {
  private let viewInstance: PlayerView
  private let methodChannel: FlutterMethodChannel

  public init(
    frame: CGRect,
    viewIdentifier viewId: Int64,
    arguments args: Any?,
    binaryMessenger messenger: FlutterBinaryMessenger
  ) {
    viewInstance = PlayerView()
    methodChannel = FlutterMethodChannel(name: "native_plugin/native_view_\(viewId)", binaryMessenger: messenger)
    super.init()
    methodChannel.setMethodCallHandler { [weak self] call, result in
      self?.onMethodCall(call, result: result)
    }
  }

  public func view() -> UIView {
    return viewInstance
  }

  private func onMethodCall(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
    switch call.method {
    case "getInternalView":
      let ptr = Unmanaged.passUnretained(viewInstance).toOpaque()
      let viewId = UInt64(UInt(bitPattern: ptr))
      result(NSNumber(value: viewId))

    case "updateContent":
      let data = call.arguments as? [String: Any]
      let lang = data?["lang"] as? String
      let cn = data?["cn"] as? String
      let en = data?["en"] as? String
      DispatchQueue.main.async { [weak self] in
        self?.viewInstance.update(withLang: lang, cn: cn, en: en)
      }
      result(nil)

    default:
      result(NSNumber(value: 0))
    }
  }
}