问如何通过按钮更新自定义单元格中分配给索引路径的核心数据

EN

var list: [NSManagedObject] = []

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationItem.title = "List"

        navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addTapped))

        let cellNib = UINib(nibName: "TableViewCell", bundle: nil)
       self.tableView.register(cellNib, forCellReuseIdentifier: "cell")   
    }

override func viewWillAppear(_ animated: Bool) {
    UIApplication.shared.statusBarStyle = .lightContent
    fetch()    
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    UIApplication.shared.statusBarStyle = UIStatusBarStyle.default
}

func save(name: String, state: Bool) {
    guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
    let managedObjectContext = appDelegate.persistentContainer.viewContext
    let entity =
        NSEntityDescription.entity(forEntityName: "Item", in: managedObjectContext)!
    let Item = NSManagedObject(entity: entity, insertInto: managedObjectContext)

    Item.setValue(name, forKeyPath: "name")
    Item.setValue(state, forKeyPath: "isChecked")
    do{
        try managedObjectContext.save()
        list.append(Item)
    } catch let error as NSError {
        print("Could not save. \(error), \(error.userInfo)")
    }
}

func fetch(){
    guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
        return
    }
    let managedObjectContext = appDelegate.persistentContainer.viewContext
    let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "Item")
    do{
        list = try managedObjectContext.fetch(fetchRequest)
    } catch let error as NSError {
        print("Could not fetch. \(error), \(error.userInfo)")
    }
}

func updateBtnState(state: Bool){

    guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
    let managedObjectContext = appDelegate.persistentContainer.viewContext
    let entity = NSEntityDescription.entity(forEntityName: "Item", in: managedObjectContext)!
    let Item = NSManagedObject(entity: entity, insertInto: managedObjectContext)

    Item.setValue(state, forKeyPath: "isChecked")

    do{
        try managedObjectContext.save()
    } catch let error as NSError {
        print("Couldnt update. \(error)")
    }
}

func updateBtnState2(indexPath: IndexPath, state: Bool){

    guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
    let managedObjectContext = appDelegate.persistentContainer.viewContext
    let item = list[indexPath.row]

    item.setValue(state, forKeyPath: "isChecked")

    do{
        try managedObjectContext.save()
        list[indexPath.row] = item
    } catch let error as NSError {
        print("Couldnt update. \(error)")
    }
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return(list.count)
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! TableViewCell
        let item = list[indexPath.row]
        cell.selectionDelegate = self
        cell.cellLabel.text = item.value(forKeyPath: "name") as? String
        cell.checkmarkButton.isSelected = item.value(forKeyPath: "isChecked") as! Bool
        return cell
    }

func updateTableView(){
    tableView.reloadData()
}

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
    }

@objc func addTapped(){

        let alert = UIAlertController(title: "New Name", message: "Add a new name", preferredStyle: .alert)

        let saveAction = UIAlertAction(title: "Save", style: .default) {
            [unowned self] action in
            guard let textField = alert.textFields?.first,
                let nameToSave = textField.text else {
                    return
            }
            self.save(name: nameToSave, state: false)
            self.tableView.reloadData()
        }

        let cancelAction = UIAlertAction(title: "Cancel", style: .default)
        alert.addTextField()
        alert.addAction(cancelAction)
        alert.addAction(saveAction)
        present(alert, animated: true)
    }

import UIKit


protocol ButtonSelectionDelegate: class {
    func fetch()
    func updateTableView()
    func updateBtnState(state: Bool)
}

class TableViewCell: UITableViewCell  {
    weak var selectionDelegate: ButtonSelectionDelegate!
    @IBOutlet var checkmarkButton: UIButton!
    @IBOutlet var cellLabel: UILabel!
    @IBAction func checkmarkBtnTapped(_ sender: UIButton) {
      sender.isSelected = !sender.isSelected
        if sender.isSelected {
            selectionDelegate?.updateBtnState(state: true)
            let image: UIImage? = UIImage(named: "done_icon.png")?.withRenderingMode(.alwaysTemplate)
            checkmarkButton.setImage(image, for: .normal)
            checkmarkButton.tintColor = UIColor( red: CGFloat(21/255.0), green: CGFloat(126/255.0), blue: CGFloat(251/255.0), alpha: CGFloat(1.0))
            selectionDelegate?.fetch()
           selectionDelegate?.updateTableView()
            print("checkmarkButton pressed to done")
        } else {
            selectionDelegate?.updateBtnState(state: false)
            let image: UIImage? = UIImage(named: "undone_icon.png")?.withRenderingMode(.alwaysTemplate)
            checkmarkButton.setImage(image, for: .normal)
            checkmarkButton.tintColor = UIColor.gray
            selectionDelegate?.fetch()
            selectionDelegate?.updateTableView()
            print("checkmarkButton pressed to undone")
        }
    }

     override func layoutSubviews() {
     super.layoutSubviews()
    let image: UIImage? = UIImage(named: "undone_icon.png")?.withRenderingMode(.alwaysTemplate)
     checkmarkButton.setImage(image, for: .normal)
     checkmarkButton.tintColor = UIColor.gray
     } 

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }
}

extension UIButton {
    func hasImage(named imageName: String, for state:     UIControlState) -> Bool {
        guard let buttonImage = image(for: state), let namedImage = UIImage(named: imageName) else {
            return false
        }
        return UIImagePNGRepresentation(buttonImage) == UIImagePNGRepresentation(namedImage)
    }
}