Accessing .recordFields from CKQueryNotification Swift 2

问题

I get the following error on didReceiveRemoteNotifications if I try to simply print this property, like:

let cloudKitNotification = CKNotification(fromRemoteNotificationDictionary:   userInfo as! [String : NSObject])     
if cloudKitNotification.notificationType == .Query {
      let queryNotification = cloudKitNotification as! CKQueryNotification
      print(queryNotification.recordFields)

Could not cast value of type '__NSCFDictionary' (0x273119c) to 'CKRecordValue' (0x2763090).

If I print the whole queryNotification, I can see the recordFields inside of it. I've spent the whole day trying to understand that. Any clues?

Xcode 7.3.1

来源：https://stackoverflow.com/questions/37059790/accessing-recordfields-from-ckquerynotification-swift-2