ios - Firebase iOS 推送通知在首次安装时不起作用

Question

当我首次安装并打开应用并接受 Apple 的通知权限警报时，我从 Firebase 收到此日志:

5.16.0 - [Firebase/InstanceID][I-IID023004] Could not update attributes of the key pair to be accessible after first unlock. update status: -25300

此后，如果我关闭应用程序或将应用程序发送到后台，我不会收到任何通知。如果我第二次打开应用程序，通知就会开始正常工作。

这是我当前的设置:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
    setupPushNotificationsHandling(application)
    return true
}

private func setupPushNotificationsHandling(_ application: UIApplication) {
    UNUserNotificationCenter.current().delegate = self
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound]) { (granted, _) in
        guard granted else { return }

        DispatchQueue.main.async {
            application.registerForRemoteNotifications()

            FirebaseApp.configure()
            InstanceID.instanceID().instanceID { (result, _) in
                // Receive notifications from the "all" topic
                Messaging.messaging().subscribe(toTopic: "all")
            }
        }
    }
}

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    print("response \(response)")
    completionHandler()
}

Answer 1

我就是这样解决的。

1. 在尝试订阅通知主题之前，我会等待调用委托(delegate)方法 application:didRegisterForRemoteNotificationsWithDeviceToken:。
2. 我会重试，直到调用 InstanceID.instanceID().instanceID 返回有效的设备 token 。

完成设置:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
    setupPushNotificationsHandling(application)
    return true
}

private func setupPushNotificationsHandling(_ application: UIApplication) {
    FirebaseApp.configure()

    application.registerForRemoteNotifications()

    UNUserNotificationCenter.current().delegate = self
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound]) { (_, _) in }
}

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    // Receive notifications from the "all" topic
    subscribeToNotificationsTopic(topic: "all")
}

func subscribeToNotificationsTopic(topic: String) {
    // Retry until the notifications subscription is successful
    DispatchQueue.global().async {
        var subscribed = false
        while !subscribed {
            let semaphore = DispatchSemaphore(value: 0)

            InstanceID.instanceID().instanceID { (result, error) in
                if let result = result {
                    // Device token can be used to send notifications exclusively to this device
                    print("Device token \(result.token)")

                    // Subscribe
                    Messaging.messaging().subscribe(toTopic: topic)

                    // Notify semaphore
                    subscribed = true
                    semaphore.signal()
                }
            }

            // Set a 3 seconds timeout
            let dispatchTime = DispatchTime.now() + DispatchTimeInterval.seconds(3)
            _ = semaphore.wait(timeout: dispatchTime)
        }
    }
}