Flutter:如何在导航回list.builder后停止它的重建

class MyListPage extends StatefulWidget {
  @override
  _MyListPageState createState() => _MyListPageState();
}

class _MyListPageState extends State<MyListPage> {
  List<String> items = ['Item 1', 'Item 2', 'Item 3'];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('List Page'),
      ),
      body: ListView.builder(
        itemCount: items.length,
        itemBuilder: (context, index) {
          return ListTile(
            title: Text(items[index]),
            onTap: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (context) => DetailPage(item: items[index]),
                ),
              );
            },
          );
        },
      ),
    );
  }

  @override
  void didUpdateWidget(MyListPage oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.items != widget.items) {
      setState(() {
        // 更新页面状态，停止重建
      });
    }
  }
}

class DetailPage extends StatelessWidget {
  final String item;

  DetailPage({required this.item});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Detail Page'),
      ),
      body: Center(
        child: Text(item),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          Navigator.pop(context); // 返回上一个页面
        },
        child: Icon(Icons.arrow_back),
      ),
    );
  }
}