CupertinoTabBar Class

 import "package:flutter/cupertino.dart";

void main()
{
  runApp(const MyApp());
}
class MyApp extends StatelessWidget
{
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return CupertinoApp(
      title: "CupertinoTabBar Class",
      debugShowCheckedModeBanner: false,
      theme: CupertinoThemeData(
        brightness: Brightness.light,
      ),
      home: CupertinoTabBarExample(),
    );
  }
}
class CupertinoTabBarExample extends StatelessWidget
{
  const CupertinoTabBarExample({super.key});

  @override
  Widget build(BuildContext context) {
    return CupertinoTabScaffold(
      tabBar: CupertinoTabBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(CupertinoIcons.star_fill),
            label: "Favorites",
          ),
          BottomNavigationBarItem(
            icon: Icon(CupertinoIcons.clock_solid),
            label: "Recent",
          ),
          BottomNavigationBarItem(
            icon: Icon(CupertinoIcons.person_alt_circle_fill),
            label: "Contacts",
          ),
          BottomNavigationBarItem(
            icon: Icon(CupertinoIcons.circle_grid_3x3_fill),
            label: "Keypad",
          ),
        ],
      ),
      tabBuilder: (BuildContext context, int index) {
        return CupertinoTabView(
          builder: (BuildContext context) {
            return Center(
              child: Text("Content of tab $index"),
            );
          },
        );
      },
    );
  }
}