TabBarView中的FutureBuilder未正确更新

class MyTabBarView extends StatefulWidget {
  @override
  _MyTabBarViewState createState() => _MyTabBarViewState();
}

class _MyTabBarViewState extends State<MyTabBarView> {
  int _currentIndex = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('TabBarView'),
      ),
      body: Column(
        children: [
          TabBar(
            tabs: [
              Tab(text: 'Tab 1'),
              Tab(text: 'Tab 2'),
              Tab(text: 'Tab 3'),
            ],
            onTap: (index) {
              setState(() {
                _currentIndex = index;
              });
            },
          ),
          Expanded(
            child: TabBarView(
              children: [
                FutureBuilder(
                  future: fetchDataForTab(0), // 自定义方法，根据Tab索引加载数据
                  builder: (context, snapshot) {
                    if (snapshot.connectionState == ConnectionState.waiting) {
                      return Center(child: CircularProgressIndicator());
                    } else if (snapshot.hasError) {
                      return Center(child: Text('Error: ${snapshot.error}'));
                    } else {
                      return ListView.builder(
                        itemCount: snapshot.data.length,
                        itemBuilder: (context, index) {
                          return ListTile(
                            title: Text(snapshot.data[index]),
                          );
                        },
                      );
                    }
                  },
                ),
                FutureBuilder(
                  future: fetchDataForTab(1),
                  builder: (context, snapshot) {
                    // 同上，根据Tab索引加载数据
                  },
                ),
                FutureBuilder(
                  future: fetchDataForTab(2),
                  builder: (context, snapshot) {
                    // 同上，根据Tab索引加载数据
                  },
                ),
              ],
              controller: TabController(
                length: 3,
                initialIndex: _currentIndex,
                vsync: this,
              ),
            ),
          ),
        ],
      ),
    );
  }
}