navigationItem.title from UITableViewCell - ios

Question

Navigation Bar title is not appearing according to the Selected Cell.
I have the Navigation View Controller inside a Container View.
The Container View is in ViewController.
ViewController:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "embedseg" {
guard let splitViewController = segue.destination as? UISplitViewController,
let leftNavController = splitViewController.viewControllers.first as? UINavigationController,
let masterViewController = leftNavController.topViewController as? MasterViewController,
//let detailViewController = splitViewController.viewControllers.last as? DetailViewController
let rightNavController = splitViewController.viewControllers.last as? UINavigationController,
let detailViewController = rightNavController.topViewController as? DetailViewController
else { fatalError() }
let firstMonster = masterViewController.monsters.first
detailViewController.monster = firstMonster
masterViewController.delegate = detailViewController
detailViewController.navigationItem.leftItemsSupplementBackButton = true
detailViewController.navigationItem.leftBarButtonItem = splitViewController.displayModeButtonItem
//detailViewController.navigationItem.title = "Hello" <-- tested this, it worked.
//detailViewController.navigationItem.title = cell.textLabel?.text <-- this didn't work.
//detailViewController.navigationItem.title = monster.name <-- and this didn't work.
}
}
MasterViewController:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let monster = monsters[indexPath.row]
cell.textLabel?.text = monster.name
return cell
}

Answer 1

When you select the cell
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = tableView.cellForRow(at: indexPath) as! YourCellClassName
self.performSegue(withIdentifier: "embedseg", sender:cell.textLabel?.text)
}
in prepareforSegue
let cellText = sender as! String
detailViewController.navigationItem.title = cellText

Answer 2

This happens because monster and cell are defined inside
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {}
but not inside
override func prepare(for segue: UIStoryboardSegue, sender: Any?){}
If you have set your segues using the storyboard you can do something like this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?){
if let cell = sender as? UITableViewCell {
detailViewController.navigationItem.title = cell.textLabel?.text
}
}
or something like this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?){
if let cell = sender as? UITableViewCell {
let indexPath = tableView.indexPath(for: cell)
detailViewController.navigationItem.title = monsters[indexPath.row].name
}
}
In the first case you cast "sender" as the cell so you can access it's values, in the second case you cast "sender" as the cell, you find what is it's indexPath and then you use the indexPath to find the correct "monster" using you array monsters