iOS, Changing the tab bar selected image

Basically tab bar provides the default case when the image is selected. sometimes we want to change its color or image. I was looking for changing image when it is selected. but A lot of information on the web is to change color.

here are the codes who like the same as I want.

class ViewControllerUITabBar: UITabBarController, UITabBarControllerDelegate {

    

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  func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {

        GS.s.selectedTab = tabBarController.selectedIndex

   case 2:

            tabBar.selectedItem?.selectedImage =  imageLiteral(resourceName: "img_message_warning")

You have to change the image in the assets to be the original image if you want the icon remains as the same image.