Erro no selector

Olá Veronica tudo bem?

Aparentemente não tem erro no seu código, copiei o seu código e executei e funcionou de boas, mesmo no novo Xcode.

O Xcode só está exibindo esse erro ou tem mais algum problema?

Eu copiei o código do projeto eggplant e mudei pra ficar com meus alimentos e agora estou com muitos erros. Por favor me ajudei. Grata, Veronica

 //
//  ViewController.swift
//  Pizza
//
//  Created by Veronica Segal on 25/09/17.
//  Copyright © 2017 Veronica Segal. All rights reserved.
//

import UIKit

 class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet var nameField : UITextField?
    @IBOutlet var happinessField : UITextField?
    var delegate : AddAMealDelegate?
    var selected = Array<Item>()

 var items = [
        Item(name: "Chocolate", calories: 140),
        Item(name: "Brownie", calories: 100),
        Item(name: "Coco", calories: 150),
        Item(name:"Muffin", calories:80),
        Item(name: "Caju", calories: 240),
        Item(name: "Cacau", calories: 500),
        Item(name: "Sorvete", calories: 800)]
    }

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

 func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    if let cell = tableView.cellForRow(at: indexPath) {
        if(cell.accessoryType == UITableViewCellAccessoryType.none) {
            cell.accessoryType = UITableViewCellAccessoryType.checkmark
            let item = items[indexPath.row]
            selected.append(item)
        } else {
            cell.accessoryType = UITableViewCellAccessoryType.none
            let item = items[indexPath.row]
            if let position = selected.index(of: item) {
                selected.remove(at: position)
            }
        }
    }
 }

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

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let row = indexPath.row
    let item = items[row]
    let cell = UITableViewCell(style: UITableViewCellStyle.default, reuseIdentifier: nil)
    cell.textLabel!.text = item.name
    return cell
 }



 @IBAction func add() {
    if(nameField == nil || happinessField == nil) {
        return
    }

    let name:String = nameField!.text!

    if let happiness = Int(happinessField!.text!) {
        let meal = Meal(name: name, happiness: happiness, items: selected)

        print("eaten \(meal.name) with happiness \(meal.happiness) with \(meal.items)!")

        if(delegate == nil) {
            return
        }

        delegate!.add(meal)

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

    }
 }


 }

Veronica tudo bem?

Olhando seu código percebi que no final da declaração da váriavel items tem uma chave "}" sobrando.

 var items = [
        Item(name: "Chocolate", calories: 140),
        Item(name: "Brownie", calories: 100),
        Item(name: "Coco", calories: 150),
        Item(name:"Muffin", calories:80),
        Item(name: "Caju", calories: 240),
        Item(name: "Cacau", calories: 500),
        Item(name: "Sorvete", calories: 800)]
    } // <--- essa chave aqui

Ela está fechando a classe e provavelmente causando erro.

Consegue verificar se seu código compila quando vc tira essa chave ?

[]s