How to refresh a ViewTable from a separate ViewController - swift

Question

I'm trying to create a swift program with a main ViewController, and a secondary VC that controls a pop up that overlays the screen. In this pop up, you can enter in login credentials, which will display in a tableView in the main ViewController.
So far I'm able to save the entered values in the secondary VC to core data, but I'm not able to reloadData() for the tableView in the first VC, because it just cant see the reloadData() function (must not be a public function? Not really sure, as I'm new to swift).
Could someone help me figure out the best way to go about doing this?
Main ViewController code:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var tableView: UITableView!
var account = [Account]()
#IBAction func onAddAccount(_ sender: Any) {
self.tableView.reloadData()
print("RELOADED")
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func onBlank() {
self.tableView.reloadData()
}
}
extension ViewController: UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return account.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell(style: .subtitle, reuseIdentifier: nil)
cell.textLabel?.text = account[indexPath.row].email
cell.detailTextLabel?.text = account[indexPath.row].password
return cell
}
}

Answer 1

I am relatively new to swift myself. But I think what you are looking for is a Delegate will tell the main controller that the data has been updated and what it's been updated too. It also seems you might need a datasource? So that you can implement model, view, controller architecture.