flutter -如何将列表中的值定位为向上？

import 'package:flutter/material.dart';

class MyListView extends StatefulWidget {
  @override
  _MyListViewState createState() => _MyListViewState();
}

class _MyListViewState extends State<MyListView> {
  ScrollController _scrollController = ScrollController();

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      controller: _scrollController,
      itemCount: 100,
      itemBuilder: (context, index) {
        return ListTile(
          title: Text('Item $index'),
        );
      },
    );
  }

  void scrollToTop() {
    _scrollController.animateTo(
      0,
      duration: Duration(milliseconds: 500),
      curve: Curves.easeInOut,
    );
  }
}