Swift iPhoneアプリにバナー広告を貼りたい

Question

参考元URL
iPhoneアプリにバナー広告を貼れるようにしたいと思っています。
↑の参考ページの手順通りにしているのですが
AppDelegate.swiftの41行目で下記のようなエラーが発生します。
自分なりに調べてみたのですが知識不足で原因がイマイチ分からずこちらに質問させて頂きました。
どうかよろしくお願い致しますm(_ _)m

Xcode11.3 swift -version5.1.3

エラーコード

'=' must have consistent whitespace on both sides
Insert ' '
'lazy' must not be used on an already-lazy global
Replace 'lazy ' with ''
Use of undeclared type 'NSPersistentContainer'

AppDelegate.swift

import UIKit
import Firebase    //  ★←追記

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        // Override point for customization after application launch.
        
        // Use Firebase library to configure APIs    ★←追記
        FirebaseApp.configure()    //  ★←追記
        
        // Initialize Google Mobile Ads SDK, application IDを設定    ★←追記
        GADMobileAds.configure(withApplicationID:"")
        
        return true
    }
    

    }

    // MARK: UISceneSession Lifecycle

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }

    // MARK: - Core Data stack

lazy var persistentContainer: NSPersistentContainer ={

        let container = NSPersistentContainer(name: "TTTEST")
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
                 
                /*
                 Typical reasons for an error here include:
                 * The parent directory does not exist, cannot be created, or disallows writing.
                 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
                 * The device is out of space.
                 * The store could not be migrated to the current model version.
                 Check the error message to determine what the actual problem was.
                 */
                fatalError("Unresolved error (error), (error.userInfo)")
            }
        })
        return container
    }()

    // MARK: - Core Data Saving support

    func saveContext () {
        let context = persistentContainer.viewContext
        if context.hasChanges {
            do {
                try context.save()
            } catch {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
                let nserror = error as NSError
                fatalError("Unresolved error (nserror), (nserror.userInfo)")
            }
        }
    }

Answer 1

'=' must have consistent whitespace on both sides

Insert ' '
'lazy' must not be used on an already-lazy global
Replace 'lazy ' with ''
Use of undeclared type 'NSPersistentContainer'
(Google翻訳)
「=」には、両側に一貫した空白が必要です
「」を挿入
「lazy」は、すでに遅延しているグローバルでは使用できません
'lazy'を ''に置き換えます
未宣言のタイプ「NSPersistentContainer」の使用

上からから４行の指摘は、指摘通りに
lazy var persistentContainer: NSPersistentContainer ={
を
var persistentContainer: NSPersistentContainer = {
へ変更。
最後の指摘は、NSPersistentContainerの定義が見つからないといっているので、
import CoreDate
を追加してみてください。

Comments

[KK.331]

解決しました！
丁寧な説明ありがとうございました。