XCode error "Cannot convert value of type 'NSIndexPath' to expected element type 'Array<IndexPath>.ArrayLiteralElement' (aka 'IndexPath')"

Question

JZX_AP OP

Created Oct ’22

Replies 2

Boosts 1

Views 2.5k

Participants 2

Hi everyone

I am new to XCode and I am following an online tutorial for a shopping list program. I have this error that appears twice, "Cannot convert value of type 'NSIndexPath' to expected element type 'Array.ArrayLiteralElement' (aka 'IndexPath')".

The tutorial I'm following is here if you need it: https://code.tutsplus.com/tutorials/ios-from-scratch-with-swift-building-a-shopping-list-application-2--cms-25516

If anyone is able to help me out or give me some guidance that would be greatly appreciated, thank you!

// MARK: -
  // MARK: Add Item View Controller Delegate Methods
  func controller(controller: AddItemViewController, didSaveItemWithName name: String, andPrice price: Float) {
    // Create Item
    let item = Item(name: name, price: price)
     
    // Add Item to Items
    items.append(item)
     
    // Add Row to Table View
    tableView.insertRowsAtIndexPaths([NSIndexPath(forRow: (items.count - 1), inSection: 0)], withRowAnimation: .None)
    // The line above is where the error occurs
    // Save Items
    saveItems()
  }
   
  // MARK: -
  // MARK: Edit Item View Controller Delegate Methods
  func controller(controller: EditItemViewController, didUpdateItem item: Item) {
    // Fetch Index for Item
    if let index = items.firstIndex(of:item) {
      // Update Table View
      tableView.reloadRowsAtIndexPaths([NSIndexPath(forRow: index, inSection: 0)], withRowAnimation: .Fade)
     // The line above is where the error occurs
    }
     
    // Save Items
    saveItems()
  }

Boost

Answer 1

Claude31 OP

Oct ’22

Accepted Answer

You are looking at an old tutorial. So some API have changed.

Use IndexPath instead of NSIndexPath, and reloadRows instead of reloadRowsAtIndexPaths

Working code is:

    tableView.insertRows([IndexPath(row: (items.count - 1), section: 0)], with: .none)


    tableView.reloadRows([IndexPath(row: index, section: 0)], with: .fade)

1

Answer 2

JZX_AP OP

Oct ’22

Thank you so much!! that fixed those errors. I am now getting a caution that says: "archiveRootObject(_:toFile:)' was deprecated in iOS 12.0: Use +archivedDataWithRootObject:requiringSecureCoding:error: and -writeToURL:options:error: instead"

Are you able to help with this?

            // Write to File
            if NSKeyedArchiver.archiveRootObject(items, toFile: itemsPath) {
              ud.set(true, forKey: "UserDefaultsSeedItems")
            }
          }

0