UserDefault Won't save data in tableView Swift 4 - ios

Question

I have been trying to save data when reloading app. However some how data won't save.
my global variable
let defaults = UserDefaults.standard
this is my code on AddTaskView
#IBAction func addTask(_ sender: Any) {
let date = datePicker.date
let dateStr = dateFormatter.string(from: date)
taskArray.append(selectedTask)
dateArray.append(dateStr)
defaults.set(selectedTask, forKey: "task")
defaults.set(dateStr, forKey: "date")
dismiss(animated: true, completion: nil)
}
In my ViewController I have my viewWillApper
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
defaults.string(forKey: "task")
defaults.string(forKey: "date")
tableView.reloadData()
}
If I print the data coming back from AddTaskView It will print on console
but data disappear when reloading app
tableView.dataSource = self (saved in my viewDidLoad)
this is my tableView
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "taskCell", for: indexPath)
cell.textLabel?.text = "\(indexPath.row + 1). \(taskArray[indexPath.row])"
cell.detailTextLabel?.text = dateArray[indexPath.row]
return cell
}
What Am I doing wrong?
thanks

Answer 1

You have multiple checks to do:
defaults.string(forKey: "task") has a return value that you dont use
As you append entered data, check if its has been append.
If entered value is there, check count of rows of the table.
I believe the key to solve your problem is in one of these points.

Answer 2

Took me a while but I finally figured
#IBAction func addTask(_ sender: Any) {
let date = datePicker.date
let dateStr = dateFormatter.string(from: date)
taskArray.append(selectedTask)
dateArray.append(dateStr)
defaults.set(taskArray, forKey: "task")
defaults.set(dateArray, forKey: "date")
defaults.synchronize()
dismiss(animated: true, completion: nil)
}
func loadUserDefaults() {
if let tempStr = defaults.stringArray(forKey: "task") {
taskArray = tempStr as [String]
}
if let tempDateStr = defaults.stringArray(forKey: "date") {
dateArray = tempDateStr as [String]
}
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
loadUserDefaults()
}