Saving the tableview text after edited swift - ios

Question

I have managed to create a tableview with an array or messages and when i tapped a tableview cell it shows an alertview and a uitextfield that you can change the text of the tableview. What i'm trying to do now is to save the tableview text ("message") when it changed. Because when I go to another view controller and go back it does not save. I am new on swift programming and wondering how can i achieve that. I have read some articles that i need to use nsuserdefaults but i am not familiar with that. here is my code below. Thanks guys.
class Messages: UITableViewController {
#IBOutlet var uitableView: UITableView!
var tField: UITextField!
var index: Int?
var msgArray: [String]!
var messages = ["Message 1", "Message 2", "Message 3", "Message 4", "Message 5", "Message 6"]
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return messages.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let messagesCell = 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: "Done", style: UIAlertActionStyle.default, handler:{ (UIAlertAction) in
let modelString = self.tField.text
self.messages[self.index!] = modelString!
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 = messages[index!]
}
}
}

Answer 1

Try to use nsuserdefaults. In SWIFT 3
override func viewWillAppear(_ animated: Bool) {
//Get the array
if let array = UserDefaults.standard.object(forKey:"messages") as? Array<String> {
self.messages = array
}
}
func changeMessage() {
let alert = UIAlertController(title: "Message", message: "Enter new preset message", preferredStyle: UIAlertControllerStyle.alert)
alert.addTextField(configurationHandler: configurationTextField)
let doneAction = UIAlertAction(title: "Done", style: UIAlertActionStyle.default, handler:{ (UIAlertAction) in
let modelString = self.tField.text
self.messages[self.index!] = modelString!
UserDefaults.standard.set(self.messages, forKey: "messages") // Set the array with changes
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)
}

Answer 2

let defaults = UserDefaults.standard
defaults.set("123", forKey: "oldString")
print("\(UserDefaults.standard.value(forKey: "oldString")!)")
This may help you.