Flutter Scroll Bar 만들기

custom picker

void _showPicker(BuildContext ctx) {
    showCupertinoModalPopup(
        context: ctx,
        builder: (_) => SizedBox(
              width: 300,
              height: 250,
              child: CupertinoPicker(
                backgroundColor: Colors.white,
                itemExtent: 30,
                scrollController: FixedExtentScrollController(initialItem: 1),
                children: const [
                  Text('0'),
                  Text('1'),
                  Text('2'),
                ],
                onSelectedItemChanged: (value) {
                  setState(() {
                    _selectedValue = value;
                  });
                },
              ),
            ));
}

출처 : Flutter: CupertinoPicker Example

출처 : [Flutter] 스크롤 바 직접 만들기 - Vertical Indicator