https://github.com/firebase/firebase-ios-sdk

然後選擇常用的Library
帳號登入功能
FirebaseAuth
存取 Firestore 資料庫
FirebaseFirestoreSwift-Beta
存取 Storage 上的檔案
FirebaseStorageSwift-Beta

import UIKit
import Firebase

@main
class AppDelegate: UIResponder, UIApplicationDelegate {



    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        FirebaseApp.configure()
        return true
    }
}