How to Access Index of Tabbar Item Using Swift

Unable to access index of tabBar item using swift

items is Optional - you can do:

   if let items = self.tabBar.items {
    println("\(items[1])")
  }

or

  var cameraTab : UITabBarItem = self.tabBar.items![1] as UITabBarItem

iOS: How to open 0th Index of tabBarItem by clicking 3rd index of tabBarItem

You don't want your view controller's base class to be a UITabBarDelegate. If you were to do that, all of your view controller subclasses would be tab bar delegates. What I think you want to do is to extend UITabBarController

class FiveTabbarController: UITabBarController, UITabBarControllerDelegate {

then, in that class, override viewDidLoad and in there set the delegate property to self:

 override func viewDidLoad() {
        super.viewDidLoad()
        self.delegate = self
    }

now this class is both a UITabBarDelegate (because UITabBarController implements that protocol), and UITabBarControllerDelegate, and you can override/implement those delegate's methods as desired, such as:

    extension FiveTabbarController: UITabBarControllerDelegate {

    func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
       if let getSelectedIndex = tabBarController.viewControllers?.firstIndex(of: viewController), getSelectedIndex == 2 {
            self.selectedIndex = 0
        }
    }
}

How to get index of selected tab in UITABBAR

https://developer.apple.com/documentation/uikit/uitabbar

UITabBar has 2 properties "items" and "selectedItem", both of type UITabBarItem.

So u can get the index of selected item by getting the index of "selectedItem" in "items".

items.index(of: selectedItem)

How to add a TabBarItem in specific index of UITabBarController?

Here a way to insert new view tab bar item :

import UIKit

class ViewController: UIViewController {
    
    // button and textfields are defined in the storyboard
    @IBOutlet var button: UIButton!
    var tabbar: UITabBarController?
    @IBOutlet var label: UITextField!
    @IBOutlet var image: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        label.text = "Four"
        image.text = "info.circle.fill"
        tabbar = self.tabBarController
    }

    @IBAction func addVC(button: UIButton) {
        // remove keyboard
        label.resignFirstResponder()
        image.resignFirstResponder()
        // check that everything is set
        if var tbVC = tabbar?.viewControllers,
           let title = label.text,
           let imageName = image.text {
            // create new view controller
            let newVC = UIViewController()
            
            // vreate the tab bar item for the new view controller
            let tabBarItem = UITabBarItem(title: title,
                                          image: UIImage(systemName: imageName),
                                          tag: tbVC.count + 1)
            newVC.tabBarItem = tabBarItem
            
            // insert new tab in tab bar view controller
            tbVC.insert(newVC, at: 2)
            
            // update the teb bar controller
            tabbar?.setViewControllers(tbVC, animated: true)
        }
    }

}

UITabBar(Controller) - Get index of tapped?

The answer depends on whether or not the UITabBar is managed by a UITabBarController or not.

Case 1 - UITabBar is already handled by a UITabBarController

Implement the UITabBarControllerDelegate protocol. Specifically the tabBarContoller:didSelectViewController: method. Set an instance of your class that implements the protocol as the delegate of the UITabBarController.

- (void)tabBarController:(UITabBarController *)theTabBarController didSelectViewController:(UIViewController *)viewController {
    NSUInteger indexOfTab = [theTabBarController.viewControllers indexOfObject:viewController];
    NSLog(@"Tab index = %u (%u)", (int)indexOfTab);
}

In this case you have to be aware of the special situation where you have enough controllers in the tab controller to cause the "More" tab to be displayed. In that case you'll receive a call to the tabBarController:didSelectViewController: with a view controller that isn't in the list (it's an instance of an internal UIKit class UIMoreNavigationController). In that case the indexOfTab in my sample will be NSNotFound.

Case 2 - UITabBar is NOT already handled by a UITabBarController

Implement the UITabBarDelegate protocol. Specifically the tabBar:didSelectItem: method. Set an instance of your class that implements the protocol as the delegate of the UITabBar.

- (void)tabBar:(UITabBar *)theTabBar didSelectItem:(UITabBarItem *)item {
    NSUInteger indexOfTab = [[theTabBar items] indexOfObject:item];
    NSLog(@"Tab index = %u", (int)indexOfTab);
}

EDIT: Modified the method parameter variables to eliminate the OP's compilation warning about tabBarController being hidden.

Selected Index on Tab Bar not working on Swift

You are saying that

class MainTabBarController: UITabBarController {

so self refers to a UITabBarController, but you are setting the selected index of tabBarController of self:

self.tabBarController?.selectedIndex = 2

There are no tab bar controllers embedded in self. self itself is a tab bar controller! You can just set self.selectedIndex:

self.selectedIndex = 2

Also, you should do that in viewDidLoad instead of viewDidAppear, because viewDidAppear can happen many times (every time some modal controller is dismissed for example). viewDidLoad will only be called once.

Get selected index tabbar controller Swift

application.tabBarController is an optional, this means it can be nil.
If you are sure it will never be nil, do this:

var selectedIndex = tabBarController!.selectedIndex

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