cupertino_action_sheet_sample.dart

  showActionSheet(
      context: context,
      child: CupertinoActionSheet(
        message: const Text('Select image from'),
        actions: <Widget>[
          CupertinoActionSheetAction(
            child: Padding(
              padding: const EdgeInsets.only(right: 16.0),
              child: Text(
                'Camera',
                style: TextStyle(color: Color(Const.colorPrimary)),
              ),
            ),
            onPressed: () {
              Navigator.pop(context, "0");
            },
          ),
          CupertinoActionSheetAction(
            child: Padding(
              padding: const EdgeInsets.only(right: 16.0),
              child: Text('Gallery',
                  style: TextStyle(color: Color(Const.colorPrimary))),
            ),
            onPressed: () {
              Navigator.pop(context, "1");
            },
          ),
        ],
        cancelButton: CupertinoActionSheetAction(
          child: const Text('Cancel',
              style: TextStyle(color: Color(Const.colorPrimary))),
          isDefaultAction: true,
          onPressed: () {
            Navigator.pop(context, '2');
          },
        ),
      ),
    );