为什么我收到远程通知时没有发送本地通知？

Question

我正在尝试在收到远程 FCM 通知时发送位置通知，因为据我所知 FCM 通知不支持操作按钮。但是本地通知有时只会发送，在我看来它是随机的。我总是收到远程通知。我想在所有三个状态、前台、后台或应用程序被杀死时获得本地通知。

这里是我在 didFinishLoadingWithOptions 中添加按钮的地方：

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {


  let incrementAction = UIMutableUserNotificationAction()
    incrementAction.identifier = "First"
    incrementAction.title = "First"
    incrementAction.activationMode = UIUserNotificationActivationMode.foreground
    incrementAction.isAuthenticationRequired = true
    incrementAction.isDestructive = true


    let decrementAction = UIMutableUserNotificationAction()
    decrementAction.identifier = "second"
    decrementAction.title = "second"
    decrementAction.activationMode = UIUserNotificationActivationMode.foreground
    decrementAction.isAuthenticationRequired = true
    decrementAction.isDestructive = false

    // Category
    let counterCategory = UIMutableUserNotificationCategory()
    counterCategory.identifier = "BOOKING_CATEGORY"

    // A. Set actions for the default context
    counterCategory.setActions([incrementAction, decrementAction],
                               for: UIUserNotificationActionContext.default)

    // B. Set actions for the minimal context //No more than 2
    counterCategory.setActions([incrementAction, decrementAction],
                               for: UIUserNotificationActionContext.minimal)

    // iOS 9 support
else if #available(iOS 9, *) {

    UIApplication.shared.registerUserNotificationSettings(UIUserNotificationSettings(types: [.badge, .sound, .alert], categories: NSSet(object: counterCategory) as? Set<UIUserNotificationCategory>))
    UIApplication.shared.registerForRemoteNotifications()
}

}

这里是我创建本地通知的地方：

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {

    if UIApplication.shared.applicationState == UIApplicationState.active {
        // Do something you want when the app is active
    } else {
        // Do something else when your app is in the background
    }

    // fire a local notification upon receiving FCM notification
    let localNotification = UILocalNotification() 
    localNotification.alertTitle = "Notification Title"
    localNotification.alertBody = "more details"
    localNotification.alertAction = "ShowDetails"
    localNotification.fireDate = NSDate().addingTimeInterval(5) as Date
    localNotification.soundName = UILocalNotificationDefaultSoundName
    localNotification.applicationIconBadgeNumber = 1
    localNotification.category = "BOOKING_CATEGORY"
    UIApplication.shared.scheduleLocalNotification(localNotification)

    print("Push notification received bkg: \(userInfo)")
    print("completed"  , completionHandler)
}

任何帮助将不胜感激。

Answer 1

为了确保您的应用始终处理通知的显示方式（即使它未运行或在后台），您需要设置data 有效负载仅，例如

{
  "to":"push_token",
    "content_available": true,
    "priority": "high",
    "data": {
      "title": "New Message",
      "message": "Bob sent you a message",
    }
}

设置notification 有效负载会触发 FCM 代表客户端应用自动向最终用户设备显示消息。如果您改用数据负载，您可以完全控制通知的显示方式。

欲了解更多信息，请查看https://firebase.google.com/docs/cloud-messaging/concept-options