void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const TextFieldPage(),
    );
  }
}

class TextFieldPage extends StatefulWidget {
  const TextFieldPage({Key? key}) : super(key: key);

  @override
  State<TextFieldPage> createState() => _TextFieldPageState();
}

class _TextFieldPageState extends State<TextFieldPage> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        mainAxisAlignment: MainAxisAlignment.end,
        children: [
          const Spacer(),
          const Text('Keyboard animation', style: TextStyle(fontSize: 26)),
          const Spacer(),
          SizedBox(
              height: 60 + MediaQuery.of(context).padding.bottom,
              child: const CupertinoTextField(
                decoration: BoxDecoration(color: Colors.red),
              )),
        ],
      ),
    );
  }
}