将 Facebook SDK 与 Xcode Swift 项目集成 - AppDelegate 错误？

我正在尝试根据此处的指南集成 Facebook SDK：https : //developers.facebook.com/docs/swift/getting-started

我已经完成了 CocoaPods 步骤，现在处于“连接您的应用程序委托”阶段。但是我从 Xcode 收到错误，阻止编译：使用未解析的标识符：SDKApplicationDelegate 未解析标识符的用户：SDKApplicationDelegate

这是我的 AppDelegate。我是否缺少导入语句或其他内容？

    //
//  AppDelegate.swift
//  TestFBSDK
//
//  Created by laurie hocking on 09/02/2019.
//  Copyright © 2019 laurie hocking. All rights reserved.
//

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        SDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
        return true
    }
    func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
        return SDKApplicationDelegate.sharedInstance().application(app, open: url, options: options)
    }
    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(_ application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }


}