override func viewDidLoad() {
super.viewDidLoad()

let fetchRequest: NSFetchRequest<Events> = Events.fetchRequest()

let sortDescriptor = NSSortDescriptor(key: "date", ascending: false)

fetchRequest.sortDescriptors = [sortDescriptor]


if let context = (UIApplication.shared.delegate as? AppDelegate)?.coreDataStack.persistentContainer.viewContext {


    fetchResaultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: context, sectionNameKeyPath: "date", cacheName: nil)

    fetchResaultsController.delegate = self

    do {
        try fetchResaultsController?.performFetch()
        nameEvents = fetchResaultsController.fetchedObjects!
        print("success")
    } catch let error as NSError {
        print(error.localizedDescription)
    }
}

func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
    tableViewEvents.beginUpdates()
}

func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {

    switch type {

    case .insert: guard let indexPath = newIndexPath else {break}
    tableViewEvents.insertRows(at: [indexPath], with: .automatic)

    case .delete: guard let indexPath = indexPath else {break}
    tableViewEvents.deleteRows(at: [indexPath], with: .automatic)


    case .update: guard let indexPath = indexPath else {break}
    tableViewEvents.reloadRows(at: [indexPath], with: .automatic)

    default:
        tableViewEvents.reloadData()
    }

    nameEvents = controller.fetchedObjects as! [Events]
}

func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange sectionInfo: NSFetchedResultsSectionInfo, atSectionIndex sectionIndex: Int, for type: NSFetchedResultsChangeType) {
    switch type {
    case .insert:
        tableViewEvents.insertSections(IndexSet(integer: sectionIndex), with: .fade)
    case .delete:
        tableViewEvents.deleteSections(IndexSet(integer: sectionIndex), with: .fade)
    case .move:
        break
    case .update:
        break
    }
}

func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
    tableViewEvents.endUpdates()
}



    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let sectionInfo = fetchResaultsController.sections![section]
        return sectionInfo.numberOfObjects
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        return fetchResaultsController.sections!.count }

   func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {


    let cell = tableViewEvents.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! EventTableViewCell

    cell.descriptionCell.text = nameEvents[indexPath.row].descript
    cell.photoEvent.image = UIImage(data: nameEvents[indexPath.row].photo!)


    return cell
}


    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        let theSection = fetchResaultsController.sections![section].name

        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss ZZ"
        let date = formatter.date(from: theSection)
        //formatter.dateFormat = "MMMM yyyy"

        var formattedDateStr: String? = nil
        if let aDate = date {
            formattedDateStr = formatter.string(from: aDate)
        }
        return formattedDateStr