Firebase Notifications Swift 3

Question

我的主要错误是：

" #Selector的参数是指未暴露于Objective-C的实例方法'tokenrefreshnotification'

这是我的AppDelegate：

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    let gcmMessageIDKey = "gcm.message_id"
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        GMSServices.provideAPIKey("appKey")
        FIRApp.configure()
        //Firebase
        if #available(iOS 10.0, *) {
            // For iOS 10 display notification (sent via APNS)
            UNUserNotificationCenter.current().delegate = self
            let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
            UNUserNotificationCenter.current().requestAuthorization(options: authOptions,
                                                                    completionHandler: {_, _ in})
            // For iOS 10 data message (sent via FCM)
            FIRMessaging.messaging().remoteMessageDelegate = self
        } else {
            let settings: UIUserNotificationSettings = UIUserNotificationSettings(types: [ .alert, .badge, .sound], categories: nil)
            application.registerUserNotificationSettings(settings)
        }
        application.registerForRemoteNotifications()

        // Add observer for iNSTANCEid TOKEN REFRESH CALLBACK.
        NotificationCenter.default.addObserver(self, selector: #selector(self.tokenRefreshNotification), name: .firInstanceIDTokenRefresh, object: nil)
        // Override point for customization after application launch.
        return FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
    }
    // [START refresh_token]
    func tokenRefreshNotification(_ notification: Notification)
    {
        if let refreshedToken = FIRInstanceID.instanceID().token() {
            print("InstanceID Token (refreshedToken)")
        }
        // Connect to FCM since connection may have failed when attempted before having a token
        connectToFCM()
    }
    // [END refresh_token]
    // [START connect_to_fcm]
    func connectToFCM()
    {
        // Won't connect since there is no token
        guard FIRInstanceID.instanceID().token() != nil else {
            return
        }
        // Disconnect previous FCM connection if it exists
        FIRMessaging.messaging().disconnect()
        FIRMessaging.messaging().connect(completion: {(error) in
            if error != nil {
                print("Unable to connect with FCM (error)")
            } else {
                print("Connected to FCM")
            }
        })
    }
    // [END connect_to_fcm]

错误行是：

NotificationCenter.default.addObserver(self, selector: #selector(self.tokenRefreshNotification), name: .firInstanceIDTokenRefresh, object: nil)

如果我将@objc添加到tokenrefreshnotification中，我会收到一个新错误：

"方法不能是标记@objc，因为参数的类型无法在目标c中表示

Answer 1

选择器是错误的，应为

NotificationCenter.default.addObserver(self, selector: #selector(tokenRefreshNotification:), name: .firInstanceIDTokenRefresh, object: nil)

在选择器的末尾必须有一个"："。

此外，方法签名似乎是错误的，应该是

@objc func tokenRefreshNotification(notification: Notification) {

下划线太多。