programmatically creating a UITabBarController subViews not loading UITabBarItem images - ios

Question

I am programicaly loading Storyboards into a UITabBarController but for some reason UITabBarItem are not loading the image or selectedImage for all except the first Tab are not loading
But if you tap other tabs icons load
Loading Storyboard Example
import UIKit
class ProfileViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let defaultImag = UIImage(named: "Profile")?.withRenderingMode(.alwaysOriginal)
let selectedImag = UIImage(named: "Profile_selected")?.withRenderingMode(.alwaysOriginal)
self.tabBarItem = UITabBarItem(title: nil, image: defaultImag, selectedImage: selectedImag)
self.tabBarItem.imageInsets = UIEdgeInsets(top: 10, left: 0, bottom: -10, right: 0);
}
}
UITabBarController
import UIKit
class TabBarViewController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let discoverStoryboard = UIStoryboard(name: "Discover", bundle: nil)
let discoverViewController = discoverStoryboard.instantiateInitialViewController()! as UIViewController
let favouritesStoryboard = UIStoryboard(name: "Favourites", bundle: nil)
let favouritesViewController = favouritesStoryboard.instantiateInitialViewController()! as! FavouritesViewController
let profileStoryboard = UIStoryboard(name: "Profile", bundle: nil)
let profileViewController = profileStoryboard.instantiateInitialViewController()! as UIViewController
self.viewControllers = [discoverViewController, favouritesViewController, profileViewController]
}
}

Answer 1

private func createTabForStoryBoard(storyBoardName: String, title: String, imageName :String, tag: Int) -> (UINavigationController) {
let storyboard = UIStoryboard(name: storyBoardName as String, bundle: nil)
let viewController = storyboard.instantiateInitialViewController() as! UIViewController
let image = UIImage(named: imageName)
let tabBarItem:UITabBarItem = UITabBarItem.init(title: NSLocalizedString(title, comment: "Tab Bar Names") , image: image, tag: 0)
viewController.tabBarItem = tabBarItem
return viewController
}
// MARK: Custom Methods
func setTabBarViewControllers() {
let discoverViewController = self.createTabForStoryBoard("Discover", title: "Discover", imageName: "<image-name>", tag: 1)
let favouritesViewController = self.createTabForStoryBoard("Favourites", title: "Favourites", imageName: "<image-name>", tag: 2)
let profileViewController = self.createTabForStoryBoard("Profile", title: "Profile", imageName: "<image-name>", tag: 3)
let tabBarViewControllers = [discoverViewController, favouritesViewController, profileViewController]
self.viewControllers = tabBarViewControllers
}