iosWebViewFix/example/ios/Runner/AppDelegate.swift

import UIKit
import Flutter
//import flutter_downloader

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {

  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    /*FlutterDownloaderPlugin.setPluginRegistrantCallback({(registry: FlutterPluginRegistry) in
        
    })*/
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}