I cant set the UINavigationBarTitleItem. How do I set it? - ios

Question

I am having a problem with my navigation title and setting it with code.
Here is the structure of my code:
Navigation Controller -> TableView -> UIScreen where i want to set the title.
Here is my code:
TableViewController:
import UIKit
class ProductsTableViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(UserCell.self, forCellReuseIdentifier: cellId)
}
let cellId = "cellId"
let products = [
"Happy Face",
"Sad Face",
"High Five",
"Angry Face",
"The Earth"
]
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return products.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as! UserCell
let product = products[indexPath.row]
cell.textLabel?.text = product
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let buyProductViewController = BuyProductViewController()
let product = products[indexPath.row]
buyProductViewController.nameOfItem = product
buyProductViewController.navigationItem.title = product
performSegue(withIdentifier: "segue", sender: self)
}
}
class UserCell: UITableViewCell {
}
Setting my title View Controller:
import UIKit
class BuyProductViewController: UIViewController {
var nameOfItem: String? {
didSet {
print(nameOfItem)
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
I would very much appreciate if any1 could help me because I am very upset and have been working on this over a week and only just came across stack overflow.
Thanks.

Answer 1

This will work for you if:
1. ProductsTableViewController is embedded in UINavigationController;
2. Segue with identifier "segue" is push. Note the difference is directly setting the title of your pushed controller. NavigationBar automatically uses the displayed VC's title as navigation bar title.
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let buyProductViewController = BuyProductViewController()
let product = products[indexPath.row]
buyProductViewController.nameOfItem = product
buyProductViewController.title = product
performSegue(withIdentifier: "segue", sender: self)
}

Answer 2

Please check you have to set title in BuyProductViewController:
import UIKit
class BuyProductViewController: UIViewController {
var nameOfItem: String? {
didSet {
print(nameOfItem)
}
}
override func viewDidLoad() {
super.viewDidLoad()
self.title = nameOfItem
}
}