Tableview.reloadData doesn't work - ios

Question

I have two controllers and I'd like to pass datas between them:
This is the first controller, a tableviewcontroller.
class BooksVC: UITableViewController {
var books: [String] = []
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = "Books"
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return books.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = books[indexPath.row]
return cell
}
}
And this is the second controller, a viewcontroller
class AddController: UIViewController {
#IBOutlet weak var inputField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func done(_ sender: Any) {
let myVC = storyboard?.instantiateViewController(withIdentifier: "BooksVC") as! BooksVC
myVC.books.append(inputField.text!)
myVC.tableView.reloadData()
dismiss(animated: true, completion: nil)
}
}
Reloaddata doesn't work, can you help me I would be very glad.

Answer 1

You need to have a reference to the first view controller to do what you need.
You can do something like this:
class AddController: UIViewController {
....
weak var booksVC: BooksVC?
#IBAction func done(_ sender: Any) {
booksVC.books.append(inputField.text!)
booksVC.tableView.reloadData()
dismiss(animated: true, completion: nil)
}
}
And when you instatiate an AddController, you need to pass a reference of your BooksVC. Something like this:
addController.booksVC = self

Answer 2

Alright for second ViewController when doneButton pressed you can
dissmisstheview
trasffer data
self.parentviewController. books.apped(inputField.text!)
self.dissmissviewcontroller
than in the first VC you can do something like this
in viewWillAppear func{
tableview.reloadData()
}