Flutter -在列表中添加新项目时保持滚动位置

import 'package:flutter/material.dart';

class MyList extends StatefulWidget {
  @override
  _MyListState createState() => _MyListState();
}

class _MyListState extends State<MyList> {
  ScrollController _scrollController = ScrollController();
  List<String> _items = [];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('My List'),
      ),
      body: ListView.builder(
        controller: _scrollController,
        itemCount: _items.length,
        itemBuilder: (context, index) {
          return ListTile(
            title: Text(_items[index]),
          );
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            _items.add('New Item');
          });
          _scrollController.jumpTo(_scrollController.position.maxScrollExtent);
        },
        child: Icon(Icons.add),
      ),
    );
  }
}