Swift 3 - Push a new view but keep the same NavigationBar - ios

Question

I have a UISearchBar in my application. When I press a button to "open" the searchbar does a new view appear. But the problem is that the NavigationController changes and the UISearchBar disappear. How can I do so I can keep the current NavigationController with my searchbar even if a new view appear. (So I still searching when the new view appear)
P.s my code is not the best and I´m not using Storyboard!
class HomeController: UICollectionViewController, UICollectionViewDelegateFlowLayout, UISearchBarDelegate {
override func viewDidLoad() {
super.viewDidLoad()
collectionView?.backgroundColor = UIColor.white
setupNavigationBar()
}
Here is the new view that appear:
class UserSearchController: UICollectionViewController, UISearchBarDelegate {
override func viewDidLoad() {
super.viewDidLoad()
collectionView?.backgroundColor = UIColor.blue
}
}
And here is the whole searchbar code:
import UIKit
var searchBar = UISearchBar()
var searchBarButtonItem: UIBarButtonItem?
var logoImageView: UIImageView!
extension HomeController {
func setupNavigationBar() {
let button = UIButton(type: .system)
button.setImage(#imageLiteral(resourceName: "search"), for: .normal)
button.addTarget(self, action: #selector(showSearchBar), for: .touchUpInside)
button.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
let barButton = UIBarButtonItem(customView: button)
self.navigationItem.rightBarButtonItem = barButton
let logoImage = UIImage(named: "home")!
logoImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: logoImage.size.width, height: logoImage.size.height))
logoImageView.image = logoImage
navigationItem.titleView = logoImageView
searchBar.delegate = self
searchBar.searchBarStyle = UISearchBarStyle.minimal
searchBar.placeholder = "Search"
searchBar.barTintColor = UIColor.gray
searchBarButtonItem = navigationItem.rightBarButtonItem
}
func showSearchBar() {
let layout = UICollectionViewFlowLayout()
let userSearchController = UserSearchController(collectionViewLayout: layout)
self.navigationController?.pushViewController(userSearchController, animated: true)
searchBar.alpha = 0
navigationItem.titleView = searchBar
navigationItem.setLeftBarButton(nil, animated: true)
navigationItem.rightBarButtonItem = nil
searchBar.showsCancelButton = true
UIView.animate(withDuration: 0.5, animations: {
self.searchBar.alpha = 1
}, completion: { finished in
self.searchBar.becomeFirstResponder()
})
}
public func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
hideSearchBar()
}
func hideSearchBar() {
navigationItem.setRightBarButton(searchBarButtonItem, animated: true)
logoImageView.alpha = 0
UIView.animate(withDuration: 0.3, animations: {
self.navigationItem.titleView = self.logoImageView
self.logoImageView.alpha = 1
}, completion: { finished in
})
}
}

Answer 1

The reason why your search bar is only visible on your first View Controller is because you are using the View Controller's titleView property. Each UIViewController has it's own titleView property, so if you push a View Controller onto your first VC, it will also need to have the titleView property set to a search bar view with the required configuration.

Answer 2

I think you can create a base class, add UISearchBar above the base class, and then you want the current controller with UISearchBar to inherit your base class