iOS 15 UITabBarController’s tabBar background color turns black

I had the same issue and found the same link that is in your question. I used the same approach for the tab bar.

This is the code i am using and it works perfectly.

if #available(iOS 15.0, *) {
   let appearance = UITabBarAppearance()
   appearance.configureWithOpaqueBackground()
   appearance.backgroundColor = customColor
   
   self.tabController.tabBar.standardAppearance = appearance
   self.tabController.tabBar.scrollEdgeAppearance = view.standardAppearance
}