How to Store data permanently in Swift 3 - ios

Question

I am on a Timer project that takes a value from a variable through unwind segue to pass it to another view controller, then append its value to an Array that should be used to insert a row with the task name whenever the user pressed save button I need to save the result permanently, but I am confused which data should I save the value of the variable itself, the row, or the array?
var taskList = [String]()
#IBAction func saveToTaskList (segue: UIStoryboardSegue) {
let newItemViewController = segue.source as! AddTaskTableViewController
let name = newItemViewController.itemName
let date = newItemViewController.date
print("itemName passed is: \(name)")
if name == "" {
}
else {
print(date)
taskList.append(name!)
let indexToInsert = taskList.count == 0 ? 0 : taskList.count - 1
let indexPath = IndexPath(row: indexToInsert, section: 0)
tableView.insertRows(at: [indexPath], with: UITableViewRowAnimation.automatic)
}
}
add task view controller
Timer / Task List

Answer 1

Ok, thanks to the hint of Matt Le Fleur
I solved the issue by using objects as below:
#IBAction func saveToTaskList (segue: UIStoryboardSegue) {
let newItemViewController = segue.source as! AddTaskTableViewController
var name = newItemViewController.itemName
let date = newItemViewController.date
let itemsObject = UserDefaults.standard.object(forKey: "items")
var items:[String]
if let tempItems = itemsObject as? [String] {
items = tempItems
items.append(name!)
print(items)
} else {
items = [name!]
}
UserDefaults.standard.set(items, forKey: "items")
name = ""
}
Then added a ViewDidAppear as below:
override func viewDidAppear(_ animated: Bool) {
let itemsObject = UserDefaults.standard.object(forKey: "items")
if let tempItems = itemsObject as? [String] {
items = tempItems
}
tableView.reloadData()
}