setState上的SliverList未更新为新列表

import 'package:flutter/material.dart';

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  List<String> items = ['Item 1', 'Item 2', 'Item 3']; // 初始数据源

  void updateList() {
    // 模拟更新数据源
    items = ['Item A', 'Item B', 'Item C'];
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: CustomScrollView(
        slivers: [
          SliverList(
            delegate: SliverChildBuilderDelegate(
              (context, index) => ListTile(
                title: Text(items[index]),
              ),
              childCount: items.length,
            ),
          ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            updateList(); // 更新数据源
          });
        },
        child: Icon(Icons.refresh),
      ),
    );
  }
}