Hi!
I am very new to xcode and I am working on a shopping list program that I have followed through a tutorial online. I am currently getting this error and I am unsure what I have missed.
Any help is appreciated. Thanks so so much!
let ud = UserDefaults.standard
if !ud.bool(forKey: "UserDefaultsSeedItems") {
if let filePath = Bundle.main.path(forResource: "seed", ofType: "plist"), let seedItems = NSArray(contentsOfFile: filePath) {
// Items
var items = [Item]()
// Create List of Items
for seedItem in seedItems {
if let name = seedItem["name"] as? String, let price = seedItem["price"] as? Float { //2 Errors here; "Value of type 'Any' has no subscripts"
print("\(name) - \(price)")
// Create Item
let item = Item(name: name, price: price)
// Add Item
items.append(item)
}
}
print(items)
if let itemsPath = pathForItems() {
// Write to File
if NSKeyedArchiver.archiveRootObject(items, toFile: itemsPath) {
ud.set(true, forKey: "UserDefaultsSeedItems")
}
}
}
}
}
JZX_AP
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Hi everyone, im new to xcode and I have been following a tutorial online on how to create a shopping list program and I have recieved some errors. Is anyone able to give me some help or guidance please.
For more code and understanding here is the shopping list app guide I have been following: https://code.tutsplus.com/tutorials/ios-from-scratch-with-swift-building-a-shopping-list-application-2--cms-25516
The error I am recieving is this: "Cannot convert value of type 'String' to expected argument type 'NSNotification.Name?'"
Thank you in advance!
import UIKit
class ShoppingListViewController: UITableViewController {
let CellIdentifier = "Cell Identifier"
var items = [Item]() {
didSet {
buildShoppingList()
}
}
var shoppingList = [Item]() {
didSet {
tableView.reloadData()
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Set Title
title = "Shopping List"
// Load Items
loadItems()
// Register Class
tableView.register(UITableViewCell.classForCoder(), forCellReuseIdentifier: CellIdentifier)
// Add Observer
//I recieve the error in the line below
NSNotificationCenter.default.addObserver(self, selector: "updateShoppingList:", name: "ShoppingListDidChangeNotification", object: nil)
}
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()
}
Hello, I am receiving this caution, is anyone able to fix this please?
Thank you in advance!
if let filePath = pathForItems() {
NSKeyedArchiver.archiveRootObject(items, toFile: filePath)
// Post Notification
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "ShoppingListDidChangeNotification") , object: self)
}
}
Hi everyone,
I am new to xcode and am getting this runtime error when I click on the add button for my application. Any help would go along away, thank you!
Error: "Exception NSException * "-[Shopping_List.ListViewController addItems:]: unrecognized selector sent to instance 0x7f8fe6507b50" 0x000060000263b690"
override func viewDidLoad() {
super.viewDidLoad()
// Set Title
title = "Items"
// Register Class
tableView.register(UITableViewCell.classForCoder(), forCellReuseIdentifier: CellIdentifier)
// Create Add Button
navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(UIPushBehavior.addItem(_:)))
// Create Edit Button
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .edit, target: self, action: Selector(("editItems:")))
}
// 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.insertRows(at: [IndexPath(row: (items.count - 1), section: 0)], with: .none)
// Save Items
saveItems()
}
// MARK: -
// MARK: Actions
func addItem(sender: UIBarButtonItem) {
performSegue(withIdentifier: "AddItemViewController", sender: self)
}
func editItems(sender: UIBarButtonItem) {
tableView.setEditing(!tableView.isEditing, animated: true)
}
Hi all, I am recieving this runtime error, "[Shopping_List.AddItemViewController save:]: unrecognized selector sent to instance ..." any help would be greatly appreciated, thank you!!
//
// AppDelegate.swift
// Shopping List
//
// Created by Deepak Prasad on 1/10/22.
//
import UIKit
protocol AddItemViewControllerDelegate {
func controller(controller: AddItemViewController, didSaveItemWithName name: String, andPrice price: Float)
}
class AddItemViewController: UIViewController {
@IBOutlet var nameTextField: UITextField!
@IBOutlet var priceTextField: UITextField!
var delegate: AddItemViewControllerDelegate?
// MARK: -
// MARK: View Life Cycle
override func viewDidLoad() {
super.viewDidLoad()
}
// MARK: -
// MARK: Actions
@IBAction func cancel(sender: UIBarButtonItem) {
dismiss(animated: true, completion: nil)
}
@IBAction func save(sender: UIBarButtonItem) {
if let name = nameTextField.text, let priceAsString = priceTextField.text, let price = Float(priceAsString) {
// Notify Delegate
delegate?.controller(controller: self, didSaveItemWithName: name, andPrice: price)
// Dismiss View Controller
dismiss(animated: true, completion: nil)
}
}
}
Hi Everyone,
I am trying to save an item from my grocery list. I am recieving no errors however the item does not appear in the shopping list after I click save. Any help would be greatly appreciated, thank you!!
//
// AppDelegate.swift
// Shopping List
//
// Created by Deepak Prasad on 1/10/22.
//
import UIKit
extension Notification.Name { // Declaration is only valid at file scope
public static let kShoppingChanged = Notification.Name("ShoppingListDidChangeNotification")
}
class ShoppingListViewController: UITableViewController {
let CellIdentifier = "Cell Identifier"
var items = [Item]() {
didSet {
buildShoppingList()
}
}
var shoppingList = [Item]() {
didSet {
tableView.reloadData()
}
}
// MARK: -
// MARK: View Life Cycle
override func viewDidLoad() {
super.viewDidLoad()
// Set Title
title = "Shopping List"
// Load Items
loadItems()
// Register Class
tableView.register(UITableViewCell.classForCoder(), forCellReuseIdentifier: CellIdentifier)
// Add Observer
NotificationCenter.default.addObserver(self, selector: #selector(updateShoppingList), name: .kShoppingChanged, object: nil) //'default' label can only appear inside a 'switch' statement
}
// MARK: -
// MARK: Table View Data Source Methods
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return shoppingList.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
// Dequeue Reusable Cell
let cell = tableView.dequeueReusableCell(withIdentifier: CellIdentifier, for: indexPath as IndexPath)
// Fetch Item
let item = shoppingList[indexPath.row]
// Configure Table View Cell
cell.textLabel?.text = item.name
return cell
}
// MARK: -
// MARK: Notification Handling
@objc func updateShoppingList(notification: NSNotification) {
loadItems()
}
// MARK: -
// MARK: Helper Methods
func buildShoppingList() {
shoppingList = items.filter({ (item) -> Bool in
return item.inShoppingList
})
}
private func loadItems() {
if let filePath = pathForItems(), FileManager.default.fileExists(atPath: filePath) {
if let archivedItems = NSKeyedUnarchiver.unarchiveObject(withFile: filePath) as? [Item] {
items = archivedItems
}
}
}
private func pathForItems() -> String? {
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
if let documents = paths.first, let documentsURL = NSURL(string: documents) {
return documentsURL.appendingPathComponent("items")?.path
}
return nil
}
}
//
// AppDelegate.swift
// Shopping List
//
// Created by Deepak Prasad on 1/10/22.
//
import UIKit
protocol AddItemViewControllerDelegate {
func controller(controller: AddItemViewController, didSaveItemWithName name: String, andPrice price: Float)
}
class AddItemViewController: UIViewController {
@IBOutlet var nameTextField: UITextField!
@IBOutlet var priceTextField: UITextField!
var delegate: AddItemViewControllerDelegate?
// MARK: -
// MARK: View Life Cycle
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .save, target: self, action: #selector(save(sender:)))
}
// MARK: -
// MARK: Actions
@IBAction func cancel(sender: UIBarButtonItem) {
dismiss(animated: true, completion: nil)
}
@objc func save(sender: UIBarButtonItem) {
if let name = nameTextField.text, let priceAsString = priceTextField.text, let price = Float(priceAsString) {
// Notify Delegate
delegate?.controller(controller: self, didSaveItemWithName: name, andPrice: price)
// Dismiss View Controller
dismiss(animated: true, completion: nil)
}
}
}