NewItem dando erro ao colocar delegate no inicializador

Fiz tudo conforme o video, no entanto, ainda assim continua aparecendo esse erro ao declarar o delegate: self no inicializador.

Erro: Incorrect argument label in call (have 'delegate:', expected 'coder:') Replace 'delegate' with 'coder'

E mesmo se eu troque o delegate por coder, aparece esse erro: Cannot convert value of type 'ViewController' to expected argument type 'NSCoder'

ViewController

 @IBOutlet var tableView: UITableView?

    func add(_ item: Item) {
        items.append(item)
        if let table = tableView {
            table.reloadData()
        }
    }

    override func viewDidLoad() {
        let newItemButton = UIBarButtonItem(title: "new item",
            style: UIBarButtonItem.Style.plain, target: self,
            action: #selector(showNewItem))
        navigationItem.rightBarButtonItem = newItemButton
    }

    @objc func showNewItem() {
        let newItem = NewItemViewController(delegate: self)
        if let navigation = navigationController {
            navigation.pushViewController(newItem, animated:
                true)
        }
    }

NewItemViewController

class NewItemViewController: UIViewController {

    class NewItemViewController: UIViewController {

        var delegate:AddAnItemDelegate?

        init(delegate: AddAnItemDelegate){
            super.init(nibName: "NewItemViewController", bundle: nil)
            self.delegate = delegate
        }

        required init?(coder aDecoder: NSCoder) {
            super.init(coder: aDecoder)
        }

        @IBOutlet var nameField : UITextField?
        @IBOutlet var caloriesField : UITextField?


        @IBAction func addNewItem(){

            let name = nameField!.text
            let calories = Double(caloriesField!.text!)

            if (name == nil || calories == nil || delegate == nil) {
                return
            }

            let item = Item(name: name!, calories: calories!)
            delegate!.add(item)

            if let navigation = navigationController{
                navigation.popViewController(animated: true)
            }
        }

AddAnItemDelegate

import Foundation

protocol AddAnItemDelegate {
    func add(_ item: Item)

}