douyin_demo/ios/Runner/AppDelegate.swift

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


//@UIApplicationMain
//class AppDelegate: UIResponder, UIApplicationDelegate {
//
//  var window: UIWindow?
//
//  func application(_ application: UIApplication,
//    didFinishLaunchingWithOptions launchOptions:
//      [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
//    FirebaseApp.configure()
//
//    return true
//  }
//}