Handling Navigation controllers with multiple storyboards - ios

Question

I have a navigationController in my first storyboard. From that storyboard, I push a new viewController onto the stack but its in a different storyboard. When I try to change the background image for my secondviewController only, it doesn't work.
In my first viewController, I programmatically segue to UsersViewController, which is my second VC. Here is my first view controller and storyboard:
import UIKit
class HomeViewController: UIViewController {
#IBOutlet weak var welcomeLabel: UILabel!
#IBOutlet weak var splitLabel: UIButton!
#IBOutlet weak var rouletteLabel: UIButton!
#IBOutlet weak var quickLabel: UIButton!
#IBOutlet weak var buttonStackView: UIStackView!
override func viewDidLoad() {
super.viewDidLoad()
setup()
}
func setup() {
welcomeLabel.font = UIFont(name: Theme.headingFontName, size: 32)
splitLabel.titleLabel?.font = UIFont(name: Theme.mainFontName, size: 26)
splitLabel.backgroundColor = Theme.accent
splitLabel.layer.cornerRadius = 10
rouletteLabel.titleLabel?.font = UIFont(name: Theme.mainFontName, size: 26)
rouletteLabel.backgroundColor = Theme.delete
rouletteLabel.layer.cornerRadius = 10
quickLabel.titleLabel?.font = UIFont(name: Theme.mainFontName, size: 26)
quickLabel.backgroundColor = Theme.edit
quickLabel.layer.cornerRadius = 10
}
#IBAction func splitNavigation(_ sender: Any) {
let storyboard = UIStoryboard(name: String(describing: UsersViewController.self), bundle: nil)
let vc = storyboard.instantiateInitialViewController()!
navigationController?.pushViewController(vc, animated: true)
}
}
In my UsersViewController, I try to change the background image of the navigationbar:
import UIKit
class UsersViewController: UIViewController {
#IBOutlet weak var nameTextField: UITextField!
#IBOutlet weak var viewContainer: UIView!
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var nextBtn: UIBarButtonItem!
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
tableView.reloadData()
setup()
}
func setup() {
view.backgroundColor = Theme.background
nameTextField.borderStyle = .none
nameTextField.backgroundColor = .clear
nameTextField.underlined()
viewContainer.backgroundColor = .white
viewContainer.layer.cornerRadius = 40
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationItem.title = "People"
self.navigationController?.navigationBar.setBackgroundImage(UIImage(named: "navBar"), for: .default)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "toAddUserVC" {
let popup = segue.destination as! AddUsersViewController
popup.doneSaving = { [weak self] in
self?.tableView.reloadData()
}
}
}
}
extension UsersViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return Data.userModels.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "userCell", for: indexPath) as! UsersTableViewCell
let model = Data.userModels[indexPath.row]
cell.setup(userModel: model)
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 60
}
}
extension UITextField {
func underlined(){
let border = CALayer()
let width = CGFloat(1.0)
border.borderColor = UIColor.lightGray.cgColor
border.frame = CGRect(x: 0, y: self.frame.size.height - width, width: self.frame.size.width, height: self.frame.size.height)
border.borderWidth = width
self.layer.addSublayer(border)
self.layer.masksToBounds = true
}
}
I don't know why, but every time I navigate to the UsersViewController, the background image flashes for a quick second, and then disappears. The title and bar buttons still show. Then, if I navigate back to the first viewController, the NavigationBar is gone. Here is a gif of what happens when I try to run the code if that helps.
via GIPHY
I'm able to change the color, the translucence, and every other property of the navigationbar, expect this. I figure it something to do with the fact that it's in a different storyboard. Any help is appreciated! Thank you!