Updating Labels with value from CloudKit

Hello everybody,

UPDATE: Solution in the answers below!

I have been learning Swift for a couple of weeks now and finally decided to try myself at an own app. So far so good. However, earlier today I ran into the following issue:

I am trying to update two labels on a DetailViewController with values from CloudKit. The code I am using is functional (updating both labels with the correct values). However, it throws the following error:

"This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release."

After hours of search and basically redoing my whole code (mind you, I am still a beginner), I found the issue being the labels being updated with their values in the "fetchRecords - function", which apparently is a background thread. The CKRecordID is being passed in from the MasterViewController, depending on which cell the user selected.

This is my code:

import UIKit
import CloudKit

class DetailNews: UIViewController {

    @IBOutlet weak var detailNewsTitle: UILabel!
    @IBOutlet weak var detailNewsFullBody: UILabel!

    @IBAction func backDetailNews() {
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        dispatch_async(dispatch_get_main_queue(), {
        self.fetchRecords()
            })
    }

    func fetchRecords() {
        dispatch_async(dispatch_get_main_queue()) {

        CKContainer.defaultContainer().publicCloudDatabase.fetchRecordWithID(number) { [unowned self] (record, error) -> Void in
            if error == nil {

                self.detailNewsTitle.text = (record!.valueForKey("title")) as! String
                self.detailNewsFullBody.text = (record!.valueForKey("fullbody")) as! String
//             print("\(record!.valueForKey("fullbody"))")

                    } else {

                let ac = UIAlertController(title: "Fetch failed", message: "There was a problem fetching the list of News; please try again: \(error!.localizedDescription)", preferredStyle: .Alert)
                ac.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
                self.presentViewController(ac, animated: false, completion: nil)

                }
            }
        }
    }
}

I was unable to extract the (record!.valueForKey("title")) & (record!.valueForKey("fullbody")) out of the closure to use in another function, which I can then call on the main thread. Printing either record in the closure leads to an immediate response, without the error message.

So if anybody has a solution and could provide me with a couple of lines of code and a short explanation, I would be very grateful. I am quite certain its not very difficult. Having looked at it for hours now, I try my luck with you.

Thanks in advance.

Best regards Henrik