How to make the deleteTask method work properly? - ios

Question

I am trying to create a ToDoList in swift UI and my deleteTask function is not working properly. I tried a lot of things and none of them worked.
import UIKit
class ViewController: UIViewController {
#IBOutlet var tableView: UITableView!
var toDoTasks = [String]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.title = "SAVED TASKS"
tableView.delegate = self
tableView.dataSource = self
// setup
if !UserDefaults().bool(forKey: "setup")
{
UserDefaults().set(true, forKey: "setup")
UserDefaults().set(0, forKey: "count")
}
updateTasks()
}
func updateTasks()
{
toDoTasks.removeAll()
guard let count = UserDefaults().value(forKey: "count") as? Int else
{
return
}
for x in 0..<count
{
if let task = UserDefaults().value(forKey: "task_\(x+1)") as? String
{
toDoTasks.append(task)
}
}
tableView.reloadData()
}
#IBAction func didTapAdd()
{
let viewController = storyboard?.instantiateViewController(withIdentifier: "entry") as! EntryViewController
viewController.title = "NEW TASK"
viewController.updated =
{
DispatchQueue.main.async {
self.updateTasks()
}
}
navigationController?.pushViewController(viewController, animated: true)
}
}
extension ViewController: UITableViewDelegate
{
// function to select the rows
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
let viewController = storyboard?.instantiateViewController(withIdentifier: "task") as! TasksViewController
viewController.title = "NEW TASK"
viewController.task = toDoTasks[indexPath.row]
navigationController?.pushViewController(viewController, animated: true)
}
}
extension ViewController: UITableViewDataSource
{
// function which returns number of tasks
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return toDoTasks.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = toDoTasks[indexPath.row]
return cell
}
}
import UIKit
class TasksViewController: UIViewController {
#IBOutlet var label : UILabel!
var task : String?
var currentPosition: Int?
override func viewDidLoad() {
super.viewDidLoad()
label.text = task
navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Delete", style: .done, target: self, action: #selector(deleteTask))
}
#objc func deleteTask(_ sender: UIBarButtonItem) {
guard let currentPosition = self.currentPosition else {
return
}
let count = UserDefaults.standard.integer(forKey: "count")
UserDefaults.standard.removeObject(forKey: "task_\(currentPosition+1)")
for i in currentPosition+1..<count {
let task = UserDefaults.standard.string(forKey: "task_\(i+1)")
UserDefaults.standard.setValue(task, forKey: "task_\(i)")
}
UserDefaults.standard.setValue(count-1, forKey: "count")
navigationController?.popViewController(animated: true)
}
}
When I press the Delete button, nothing happens. Could you please help me??