Doesnt save userdefaults once the app closes - ios

Question

I have created an app that is a uitableview that has 5 arrays of cell [1, 2, 3, 4, 5] that can edit when the cell is tapped. I have accomplish that when you tapped a cell it shows an alertview and a textfield. You can edit the cell in short. And i have save the edit when it goes to another view controller. But the problem is when i try to close the app and open it, It goes back to the default number of messages like [1, 2, 3, 4, 5]. Any tips how can i save the edited cell but at the same time when the uitableview is opened it shows the array. Sorry for my english. Thanks btw i am new to programming sorry for this code
*Messages.Swift = tableview
class Messages: UITableViewController {
#IBOutlet var uitableView: UITableView!
var tField: UITextField!
var index: Int?
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
}
override func viewWillAppear(_ animated: Bool) {
//Get the array
if let array = UserDefaults.standard.object(forKey:"messages") as? Array<String> {
self.app.helper.messages = array
}
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return app.helper.messages.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let messagesCell = app.helper.messages[indexPath.row]
cell.textLabel?.text = messagesCell
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let path = tableView.indexPathForSelectedRow
index = path?.row
changeMessage()
}
func changeMessage() {
let alert = UIAlertController(title: "Message", message: "Enter new preset message", preferredStyle: UIAlertControllerStyle.alert)
alert.addTextField(configurationHandler: configurationTextField)
let doneAction = UIAlertAction(title: "Save", style: UIAlertActionStyle.default, handler:{ (UIAlertAction) in
let modelString = self.tField.text
self.app.helper.messages[self.index!] = modelString!
self.app.helper.saveToDefaults()
self.tableView.reloadData()
})
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
alert.addAction(doneAction)
alert.addAction(cancelAction)
self.present(alert, animated: true, completion: nil)
}
func configurationTextField(textField: UITextField!){
if (textField) != nil {
tField = textField
textField.text = app.helper.messages[index!]
}
}
}
*Helper.swift
class Helper {
var messages: [String] = ["1", "2", "3", "4", "5"]
func saveToDefaults() {
let defaults = UserDefaults.standard
defaults.set(messages, forKey: "messages")
defaults.synchronize()
}
}

Answer 1

try
override func viewWillAppear(_ animated: Bool) {
//Get the array
if let array = UserDefaults.standard.object(forKey:"messages") as? Array<String> {
self.app.helper.messages = array
}
//make this array global(declare it below var index: Int?)
tableView.reloadData()
}
and
let messagesCell = array[indexPath.row]

Answer 2

Try to load user default before setting the table view delegate. Because the table view is loading with the dataset you assigned in helper, not with the dataset from user default.
override func viewDidLoad() {
super.viewDidLoad()
//Get the array
if let array = UserDefaults.standard.object(forKey:"messages") as? Array<String> {
self.app.helper.messages = array
}
tableView.delegate = self
tableView.dataSource = self
}
Or you can reload the table view in view will appear after loading the dataset from user defaut
override func viewWillAppear(_ animated: Bool) {
//Get the array
if let array = UserDefaults.standard.object(forKey:"messages") as? Array<String> {
self.app.helper.messages = array
}
tableView.reloadData()
}