Since iOS 15, all nav bars are transparent by default. To restore old behaviour, set scrollEdgeAppearance to the default:
let appearance = UITabBarAppearance()
UITabBar.appearance().scrollEdgeAppearance = appearance
Solving problems using rules of thumb that cause the best change in a poorly understood situation using available resources
Since iOS 15, all nav bars are transparent by default. To restore old behaviour, set scrollEdgeAppearance to the default:
let appearance = UITabBarAppearance()
UITabBar.appearance().scrollEdgeAppearance = appearance