swift tableview sentence bug - ios

Question

I am trying to make a tableview where the user can click on the cells so the cells open a new ViewController which sets the navbar title to the clicked cell's label.
It doesn't really work for me because when I click on a cell it opens a view which has the previously clicked cell's value (not the current cells value) and then again opens a new view where the title is the current cells's value.
I uploaded the viewcontrollers to a GitHub repo: https://github.com/SiposPtr/stackoverflow
var selectedValue: String?
var numberOfFileToLoad: Int = 1
let cellak = [
"Első",
"Második",
"Harmadik",
"Negyedik",
"Ötödik",
"Hatodik",
"Hetedik",
"Nyolcadik",
"Kilencedik"
]
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return cellak.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath)
cell.textLabel?.text = cellak[indexPath.row]
// Configure the cell...
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
selectedValue = cellak[indexPath.row]
numberOfFileToLoad = indexPath.row + 1
performSegue(withIdentifier: "gotoSentences", sender: nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "gotoSentences"{
let nextViewController = segue.destination as! ButtonEditViewController
nextViewController.title = selectedValue
nextViewController.numberOfFileToLoad = numberOfFileToLoad
}
}

Answer 1

It seems the segue is performed twice. If you have a segue connection from a table view cell to next view controller, the segue performed immediately after the cell is selected and didSelectRowAt method will be called after that.
You can get the selected row in prepare for segue method and pass the selected data to next view controller.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "gotoSentences"{
if let nextViewController = segue.destination as? ButtonEditViewController,
let indexPath = tableView.indexPathForSelectedRow {
nextViewController.title = cellak[indexPath.row]
nextViewController.numberOfFileToLoad = indexPath.row + 1
}
}
}