how to change UITabBarItem's Title dynamically

Question

I have a TabBarController in my App, and the 2nd item should have title Login or Profile depending on whether the user is logged in or not.

in TabBarController:

import UIKit

class TabNavigationBarVC: UITabBarController, UITabBarControllerDelegate {

    override func viewDidLoad() {
        self.delegate = self
        if UserDefaults.standard.bool(forKey: "isUserLoggedIn") {
            tabBar.items?[1].title = "Prof"
            tabBar.items?[1].image = UIImage(named: "user_male")

        } else {
            tabBar.items?[1].title = "Log"
            tabBar.items?[1].image = UIImage(named: "user_male")          
        }        
    }
}

and 2nd TabBarItem is connected with RouterVC:

import UIKit
class RouterViewController: UINavigationController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let profile = storyboard?.instantiateViewController(withIdentifier: "ComponentUserProfile") as? UserProfileViewController
        let login = storyboard?.instantiateViewController(withIdentifier: "ComponentLogin")  as? LoginViewController
        if UserDefaults.standard.bool(forKey: "isUserLoggedIn") {
        //profile?.tabBarItem.title = "prr" - no effect
        //profile?.tabBarItem = UITabBarItem(title: "PROFILE", image: UIImage(named: "user_male"), tag: 0) - no effect
            viewControllers = [profile] as! [UIViewController]
       } else {
        //login?.tabBarItem.title = "logg"- no effect
        //login?.tabBarItem = UITabBarItem(title: "LOGIN", image: UIImage(named: "user_male"), tag: 0)- no effect
            viewControllers = [login] as! [UIViewController]
       }
    }
}

all works correctly but only when the user launches the app. Later, after the user has logged out, I would like the 2nd title in the tabBar to change from Profile to login, or - when the user is successfully logged in - from Login to Profile. I tried something like commented lines of code in RouterVC, but nothing changed.

And in LoginVC this lines not working too:

override func viewWillAppear(_ animated: Bool) {
        self.tabBarItem.title = "loggggg"
    }

How can I make this change dynamically?

Maybe I should write extension for TabBarController to track if UserDefaults.standard.bool(forKey: "isUserLoggedIn") is changed and display correct title of the tabbarItem?..

p.s.navigation between views, login/logout works good, the point is only in title

p.p.s - find the answer how get access to the title from view - add self.tabBarController?.tabBar.items?[1].title = "profile", but still looking for some common decision, like tracking UserDefaults key..

score 0 · Answer 1 · answered Nov 07 '18 at 13:58

0

you can update the selected Item title using

self.tabBarController?.tabBar.selectedItem?.title = "demo"

answered Nov 07 '18 at 13:58

Raul Mantilla

334
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how to change UITabBarItem's Title dynamically

1 Answers1