Trying to find a better approach to custom tab bar - ios

Question

I'm trying to create a custom TabBar.
My approach so far, was to create one UIViewController (Let's call it the TabBarController), In the TabBarController, I added a childVC (Let's call it UserViewController).
I couldn't figure out a way to change the UserViewController without making the TabBarController to disappear.
I started to think maybe this is not a good option, and that there most be a better, actually working way to do so.
All I really trying to achieve is a TabBarController, separated from the UserViewController, the TabBarController will always be displayed on the bottom of the screen, and by clicking the items in it, the UserViewController will change accordingly.
I searched for hours, tried different solutions, nothing worked. Really hope you could guide me, maybe share a tutorial or article you have about this.

Answer 1

Create a subclass of UITabBarViewController.
class TabBarController: UITabBarController {
var previousTabIndex: Int?
override func viewDidLoad() {
super.viewDidLoad()
let viewControllerOne = ViewController()
viewControllerOne.tabBarItem.image = UIImage(named: "one")
viewControllerOne.tabBarItem.title = "One"
let viewControllerTwo = ViewController()
viewControllerTwo.tabBarItem.image = UIImage(named: "two")
viewControllerTwo.tabBarItem.title = "Two"
let viewControllerThree = ViewController()
viewControllerThree.tabBarItem.title = "Premium"
viewControllerThree.tabBarItem.image = UIImage(named: "three")
let tabBarList = [
viewControllerOne,
viewControllerTwo,
viewControllerThree
]
self.viewControllers = tabBarList.map {
let nav = UINavigationController(rootViewController: $0)
return nav
}
}
}
And then in SceneDelegate, set window.rootViewController = TabBarController()
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
window.rootViewController = TabBarController()
self.window = window
window.makeKeyAndVisible()
}
}
If you have created your project in older version of xCode, assign TabBarController() to window.rootController in didFinishLaunchingWithOptions of AppDelegate