如何改变TabBarButton的外观？

Question

我需要更改所选的TabBarItem的textLabel背景颜色。

Answer 1

        UITabBar.appearance().tintColor  = UIColor.red // Selected Color of tbabbar
        UITabBar.appearance().unselectedItemTintColor  = UIColor.gray // unselcted Color of tbabbar
        UITabBar.appearance().barTintColor  = UIColor.green  // background color of tabbar