在iOS上发送firebase邀请仅使用Facebook令牌登录firebase身份验证

import Firebase
import FBSDKCoreKit

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    FirebaseApp.configure()
    ApplicationDelegate.shared.application(application, didFinishLaunchingWithOptions: launchOptions)
    return true
}

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
    let handled = ApplicationDelegate.shared.application(app, open: url, options: options)
    return handled
}

import FBSDKLoginKit
import FirebaseAuth

func sendFirebaseInvitation() {
    let loginManager = LoginManager()
    loginManager.logIn(permissions: ["public_profile", "email"], from: self) { (result, error) in
        if let error = error {
            print("Facebook login failed: \(error.localizedDescription)")
            return
        }
        
        guard let accessToken = AccessToken.current else {
            print("Failed to get Facebook access token.")
            return
        }
        
        let credential = FacebookAuthProvider.credential(withAccessToken: accessToken.tokenString)
        
        Auth.auth().signIn(with: credential) { (authResult, error) in
            if let error = error {
                print("Firebase authentication failed: \(error.localizedDescription)")
                return
            }
            
            // 发送Firebase邀请的逻辑代码
        }
    }
}