Question

问候Stack的公民，当试图覆盖＆＃34; controllerDidChangeContent＆＃34;我得到＆＃34;方法不会覆盖其超类＆＃34;中的任何方法。存根由自动完成处理程序生成，它似乎符合Apple Documentation的要求。代码如下：

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)
   }
}

错误由覆盖代码产生。我把print（）放在那里作为填充物。 THX

Answer 1

删除override。

您正在实施协议，而不是覆盖。

无法覆盖NSFetchedResultsControllerDelegate中的controllerDidChangeContent

1 个答案: