返回要存储在变量中的FCM令牌(带Firebase的Swift 5)

import Firebase
import FirebaseMessaging

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    let token = deviceToken.map { String(format: "%02.2hhx", $0) }.joined()
    print("FCM Token: \(token)")
    // 将FCM令牌存储在变量中或进行其他处理
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // 其他应用程序启动代码
    
    // 注册远程通知
    UNUserNotificationCenter.current().delegate = self
    Messaging.messaging().delegate = self
    application.registerForRemoteNotifications()
    
    return true
}

extension AppDelegate: MessagingDelegate {
    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
        print("Received FCM Token: \(fcmToken)")
        // 将FCM令牌存储在变量中或进行其他处理
    }
}