Native ads in flutter iOS NativeAdFactory is not in scope

I am following the google codelab for adding native ads in flutter for android and ios. For android it is working properly. But when I run the iOS app, it gives me error that the "NativeAdFactory" is not in scope

AppDelegate.swift

import Flutter
import UIKit

import google_mobile_ads

@main
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    let nativeInlineAdFactory = NativeInlineAdFactory()
    FLTGoogleMobileAdsPlugin.registerNativeAdFactory(
        self, factoryId: "nativeInlineAd", nativeAdFactory: nativeInlineAdFactory)

    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

And Native ad factory is in same runner folder is as follows:

import google_mobile_ads

class NativeInlineAdFactory : FLTNativeAdFactory {

    func createNativeAd(_ nativeAd: GADNativeAd,
                        customOptions: [AnyHashable : Any]? = nil) -> GADNativeAdView? {
        let nibView = Bundle.main.loadNibNamed("NativeInlineAdView", owner: nil, options: nil)!.first
        let nativeAdView = nibView as! GADNativeAdView

        (nativeAdView.headlineView as! UILabel).text = nativeAd.headline

        (nativeAdView.bodyView as! UILabel).text = nativeAd.body
        nativeAdView.bodyView!.isHidden = nativeAd.body == nil

        (nativeAdView.iconView as! UIImageView).image = nativeAd.icon?.image
        nativeAdView.iconView!.isHidden = nativeAd.icon == nil

        nativeAdView.callToActionView?.isUserInteractionEnabled = false

        nativeAdView.nativeAd = nativeAd

        return nativeAdView
    }
}

How can I fix this issue?

So the problems was I added Swift files in VSCode and it was not added in the scope of the project in ios. Open the project in xcode and added those files in scope fixed the issue