activeColor property
final
      The foreground color of the icon and title for the BottomNavigationBarItem of the selected tab.
Defaults to CupertinoTheme's primaryColor if null.
Implementation
final Color? activeColor;The foreground color of the icon and title for the BottomNavigationBarItem of the selected tab.
Defaults to CupertinoTheme's primaryColor if null.
final Color? activeColor;