ios - 即使删除 CKSubscription 并读取它们后，CloudKit 也会发送多个推送通知

Question

我将表的 CKSubscription 设置为“在创建记录时触发”。当我需要更新 CKSubscription 的特定实例时，我确保在添加它之前先将其删除。

但现在每当我保存新的 CKRecord 时，我都会收到四个相同的推送通知实例。有没有人经历过这个？如果是这样，是否有解决此问题的方法？

Answer 1

是的，您需要用这样的代码告诉它您处理了通知？

func fetchNotificationChanges() {
    let operation = CKFetchNotificationChangesOperation(previousServerChangeToken: nil)

    var notificationIDsToMarkRead = [CKNotificationID]()

    operation.notificationChangedBlock = { (notification: CKNotification) -> Void in
        // Process each notification received
        if notification.notificationType == .query {
            let queryNotification = notification as! CKQueryNotification
            let reason = queryNotification.queryNotificationReason
            let recordID = queryNotification.recordID

            print("reason \(reason)")
            print("recordID \(recordID)")
            // Do your process here depending on the reason of the change

            // Add the notification id to the array of processed notifications to mark them as read
            notificationIDsToMarkRead.append(queryNotification.notificationID!)
        }
    }

    operation.fetchNotificationChangesCompletionBlock = { (serverChangeToken: CKServerChangeToken?, operationError: Error?) -> Void in
        guard operationError == nil else {
            // Handle the error here
            return
        }

        // Mark the notifications as read to avoid processing them again
        let markOperation = CKMarkNotificationsReadOperation(notificationIDsToMarkRead: notificationIDsToMarkRead)
        markOperation.markNotificationsReadCompletionBlock = { (notificationIDsMarkedRead: [CKNotificationID]?, operationError: NSError?) -> Void in
            guard operationError == nil else {
                // Handle the error here
                return
            }
        }

        let operationQueue = OperationQueue()
        operationQueue.addOperation(markOperation)
    }

    let operationQueue = OperationQueue()
    operationQueue.addOperation(operation)
}


}