根据 TabBarView 的子控件 计算出 TabBarView 的高度么

可以根据 TabBarView 的子控件计算出高度，可以使用 LayoutBuilder 和 TabBarView 的 IndexedStack 来实现。下面是一个示例代码：

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  late TabController _tabController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 2, vsync: this);
  }

  @override
  void dispose() {
    _tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('TabBarView Height'),
        bottom: TabBar(
          controller: _tabController,
          tabs: [
            Tab(text: 'Tab 1'),
            Tab(text: 'Tab 2'),
          ],
        ),
      ),
      body: Column(
        children: [
          Expanded(
            child: LayoutBuilder(
              builder: (context, constraints) {
                return IndexedStack(
                  index: _tabController.index,
                  children: [
                    Container(
                      child: SingleChildScrollView(
                        child: ConstrainedBox(
                          constraints: BoxConstraints(
                            minHeight: constraints.maxHeight,
                          ),
                          child: Column(
                            children: [
                              Text('Tab 1 Content'),
                              // Add more widgets
                            ],
                          ),
                        ),
                      ),
                    ),
                    Container(
                      child: SingleChildScrollView(
                        child: ConstrainedBox(
                          constraints: BoxConstraints(
                            minHeight: constraints.maxHeight,
                          ),
                          child: Column(
                            children: [
                              Text('Tab 2 Content'),
                              // Add more widgets
                            ],
                          ),
                        ),
                      ),
                    ),
                  ],
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}