Swift 3.0: Store array in UserDefaults for tableView - arrays

Question

I'm attempting to store an array in UserDefaults yet have had no luck in finding a solution. I have a struct and func set up that work to store "name" and "description" in an array. The code is as follows...
struct task {
var name = "Untitled"
var description = "No description available"
}
var tasks = [task]()
func addTask(name: String, description: String) {
tasks.append(task(name: name, description: description))
}
What's the best way to store the data in UserDefaults and add the information to cell.textLabel?.text and cell.detailTextLabel?.text after a relaunch?

Answer 1

It is Swift convention to name your structs starting with an uppercase letter. You need to make a class, make it NSCoding compliant and use KeyedArchiever to save the object data
class Task: NSObject, NSCoding {
let name: String
let desc: String
required init(name: String, desc: String) {
self.name = name
self.desc = desc
}
func encode(with coder: NSCoder) {
coder.encode(name, forKey: "name")
coder.encode(desc, forKey: "desc")
}
required init(coder decoder: NSCoder) {
self.name = decoder.decodeObject(forKey: "name") as? String ?? ""
self.desc = decoder.decodeObject(forKey: "desc") as? String ?? ""
}
}
Testing
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var nameField: UITextField!
#IBOutlet weak var descField: UITextField!
#IBOutlet weak var tableView: UITableView!
var tasks: [Task] = []
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
if let data = UserDefaults.standard.data(forKey: "tasks") {
tasks = NSKeyedUnarchiver.unarchiveObject(with: data) as? [Task] ?? []
tableView.reloadData()
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func addTask(_ sender: UIButton) {
guard let name = nameField.text, let desc = descField.text else { return }
tasks.append(Task(name: name, desc: desc))
UserDefaults.standard.set(NSKeyedArchiver.archivedData(withRootObject: tasks) , forKey: "tasks")
tableView.reloadData()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tasks.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cellID")!
cell.textLabel?.text = tasks[indexPath.row].name + " - " + tasks[indexPath.row].desc
return cell
}
}