actionsheet.dart

void showCupertinoSheet<T>({BuildContext context}) {
    showCupertinoModalPopup<T>(
      context: context,
      builder: (BuildContext context) => CupertinoActionSheet(
          title: const Text('Choose Options'),
          message: const Text('Your options are '),
          actions: <Widget>[
            CupertinoActionSheetAction(
              child: const Text('One'),
              onPressed: () {
                Navigator.pop(context, 'One');
              },
            ),
            CupertinoActionSheetAction(
              child: const Text('Two'),
              onPressed: () {
                Navigator.pop(context, 'Two');
              },
            )
          ],
          cancelButton: CupertinoActionSheetAction(
            child: const Text('Cancel'),
            isDefaultAction: true,
            onPressed: () {
              Navigator.pop(context, 'Cancel');
            },
          )),
    ).then<void>((T value) {
      Scaffold.of(context).showSnackBar(new SnackBar(
        content: new Text('You clicked $value'),
        duration: Duration(milliseconds: 50),
      ));
    });
  }