您可以在容器装饰上提供选项卡项外观，如

class FA extends StatefulWidget {
  const FA({super.key});

  @override
  State<FA> createState() => _FAState();
}

class _FAState extends State<FA> with SingleTickerProviderStateMixin {
  late final controller = TabController(length: 3, vsync: this)
    ..addListener(() {
      setState(() {});
    });
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: TabBar(
        controller: controller,
        isScrollable: true,
        unselectedLabelStyle: TextStyle(color: Colors.black),
        unselectedLabelColor: Colors.transparent,
        indicator: BoxDecoration(),
        indicatorPadding: EdgeInsets.zero,
        // splashBorderRadius: ,
        tabs: [
          Tab(
            iconMargin: EdgeInsets.zero,
            child: Container(
              decoration: BoxDecoration(
                  color: controller.index == 0
                      ? Colors.black
                      : Color.fromARGB(255, 164, 164, 164),
                  borderRadius: BorderRadius.circular(16)),
              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
              child: Text(
                "All",
                textAlign: TextAlign.center,
                style: TextStyle(
                  color: controller.index == 0 ? Colors.white : Colors.black,
                ),
              ),
            ),
          ),
          Tab(
            iconMargin: EdgeInsets.zero,
            child: Container(
              decoration: BoxDecoration(
                  color: controller.index == 1
                      ? Colors.black
                      : Color.fromARGB(255, 164, 164, 164),
                  borderRadius: BorderRadius.circular(16)),
              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
              child: Text(
                "Next btn",
                textAlign: TextAlign.center,
                style: TextStyle(
                  color: controller.index == 1 ? Colors.white : Colors.black,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}