ios - 在后台模式下设置 applicationIconBadgeNumber 时，推送通知正在从通知中心清除

Question

我正在后台模式下下载我的事件，因为我会收到推送和静音通知。因为当我的应用程序处于后台模式时我必须下载数据，所以我使用静默通知通过 Web 服务下载数据，在此之前我applicationIconBadgeNumber根据增量值进行更新。当我使用自动增加的值更新 applicationIconBadgeNumber 时，我的所有推送通知都在通知中心被清除。如果我没有设置任何 applicationIconBadgeNumber，它们将保持不变。正如我在下面发布的代码一样，如果我遗漏了什么，请告诉我。

var autoIncrementForNotification:Int = 0


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

    UIApplication.shared.setMinimumBackgroundFetchInterval(60)

    if #available(iOS 10, *) {
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) {(accepted, error) in
            if !accepted {
                print("Notification access denied.")
            } else {

                application.registerForRemoteNotifications()
            }
        }
    } else {

        application.registerForRemoteNotifications(matching: [.badge, .sound, .alert])
    }

    return true

}

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

    let deviceTokenString = deviceToken.reduce("", {$0 + String(format: "%02X", $1)})

    UserDefaults.standard.removeObject(forKey: "Device_Token")
    UserDefaults.standard.setValue(deviceTokenString, forKey: "Device_Token")

}



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

    let aps = userInfo["aps"] as! [String: AnyObject]
    if ((aps["content-available"] as? NSString)?.integerValue == 1)
    {
        let type = (aps["type"] as? NSString)

        if(type == Constants.action_type_Events)
        {
            if (application.applicationState == .inactive || application.applicationState == .background)
            {
                autoIncrementForNotification += 1
                application.applicationIconBadgeNumber = autoIncrementForNotification

              // Firing my Web service
                completionHandler(UIBackgroundFetchResult.newData)

            }

        }

    }

}

func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void){

    completionHandler(UIBackgroundFetchResult.newData)
}

func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
    print("i am not available in simulator \(error)")
}

func  applicationDidBecomeActive(_ application: UIApplication) {

    application.applicationIconBadgeNumber = 0
    autoIncrementForNotification = 0


}

Answer 1

请尝试以下方法：

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

    let aps = userInfo["aps"] as! [String: AnyObject]
    if let content = aps["content-available"] as? String {
        contentAvailable = Int(content)!
    } else {
        contentAvailable = aps["content-available"] as! Int
    }

    if (contentAvailable == 1)
    {
        let type = (aps["type"] as? NSString)

        if(type == Constants.action_type_Events)
        {
            if (application.applicationState == .inactive || application.applicationState == .background)
            {
                autoIncrementForNotification += 1
                application.applicationIconBadgeNumber = autoIncrementForNotification

                // Firing my Web service
                completionHandler(UIBackgroundFetchResult.newData)

            }

        }

    }

}

原因 ：

如果你的 Payload 文件是这样的，{"aps":{"content-available":1}}下面的条件不满足，所以每次applicationIconBadgeNumber都变成0

if ((aps["content-available"] as? NSString)?.integerValue == 1) 

如果您的有效负载文件是这样的，{"aps":{"content-available":"1"}}那么您的代码将正常工作。