App crash when delete cell Item with custom Button (CoreData)

Question

When i'm delete cell from my CollectionView app is crashed (CoreData).

I'm use custom button in CollectionView.

var cardItems = [NSManagedObject]()

cell.MenuButton.layer.setValue(indexPath.row, forKey: "index")
cell.MenuButton.addTarget(self, action: #selector(MenuCell), for: UIControl.Event.touchUpInside)

Error

EDIT (It's work)

let i: Int = (sender.layer.value(forKey: "index")) as! Int

guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
let managedContext = appDelegate.persistentContainer.viewContext

let indexPath = IndexPath(item: i, section: 0)
let itemToDelete = self.cardItems[indexPath.item]
self.cardItems.remove(at: indexPath.item)
managedContext.delete(itemToDelete)
appDelegate.saveContext()

self.collectionView.reloadData()

Answer 1

First of all, it's not a good way to identify the click button. Instead, you can set button tag as indexPath.row like below:

menuButton.tag = indexPath.row
cell.MenuButton.layer.setValue(indexPath.row, forKey: "index")

Also improve your coding skills see below:

cell.MenuButton.addTarget(self, action: #selector(onClickMenuButton(_:)), for: .touchUpInside)

Implement this selector as:

let i: Int = (sender.layer.value(forKey: "index")) as! Int

func onClickMenuButton(_ sender: UIButton) {
    let task = self.cardItems[sender.tag]
       if let managedContext = task.managedObjectContext {
              managedContext.delete(task)
              do {
                 try managedContext.save()
                 self.cardItems.remove(at: sender.tag)
                 let indexPath = IndexPath(row: i, section: 0)
                 self.collectionView.deleteItems(at: [indexPath])
              } catch {
                 print("Failed to delete")
              }
     }
}