add parameter on DatePickerThemeData to customize the text style of the toggle mode button #163866

class DatePickerExample extends StatelessWidget {
  const DatePickerExample({super.key});

  @override
  Widget build(BuildContext context) => Scaffold(
        body: Center(
          child: ElevatedButton(
            onPressed: () => showDatePicker(
              context: context,
              firstDate: DateTime(2025),
              lastDate: DateTime(2026),
              builder: (context, child) => Theme(
                data: ThemeData.light().copyWith(
                  textTheme: TextTheme(
                      titleSmall: TextStyle(
                      fontSize: 16,
                    ),
                  ),
                  datePickerTheme: DatePickerThemeData(
                      dayStyle: TextStyle(
                    fontSize: 12,
                  )),
                ),
                child: child!,
              ),
            ),
            child: Text('Show Date Picker'),
          ),
        ),
      );
}

class DatePickerExample extends StatelessWidget {
  const DatePickerExample({super.key});

  @override
  Widget build(BuildContext context) => Scaffold(
        body: Center(
          child: ElevatedButton(
            onPressed: () => showDatePicker(
              context: context,
              firstDate: DateTime(2025),
              lastDate: DateTime(2026),
              builder: (context, child) => DatePickerTheme(
                data: DatePickerThemeData(
                  toggleModeStyle: TextStyle(
                      fontSize: 16,
                    ),
                  dayStyle: TextStyle(
                    fontSize: 12,
                  ),
                ),
                child: child!,
              ),
            ),
            child: Text('Show Date Picker'),
          ),
        ),
      );
}