无法覆盖NSFetchedResultsControllerDelegate中的controllerDidChangeContent

Question

Greetings citizens of Stack, When trying to override "controllerDidChangeContent" I get "Method does not override any method from its superclass". The stub is produced by the autocompletion handler and it seems to match the requirements of Apple Documentation . Code follows:

import UIKit
import CoreData

  class ViewController: UITableViewController, NSFetchedResultsControllerDelegate{
  var frc: NSFetchedResultsController<People>?

    override func viewDidLoad() {
       super.viewDidLoad()

       let appdelegate = UIApplication.shared.delegate as! AppDelegate
       let context = appdelegate.persistentContainer.viewContext

       let request: NSFetchRequest<People> = People.fetchRequest()
       request.sortDescriptors = [NSSortDescriptor(key: "id", ascending: true )]

       frc = NSFetchedResultsController(fetchRequest: request,
                                     managedObjectContext: context,
                                     sectionNameKeyPath: nil,
                                     cacheName: nil)

       }

   override func controllerDidChangeContent(_ controller:  NSFetchedResultsController<NSFetchRequestResult>) {
       print(controller.description)
   }
}

The error is produced by the override code. I put the print() in there as filler. THX

Answer 1

Remove override .

You are implementing the protocol, not overriding.