让TabBarView占用所有剩余空间

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('TabBarView Demo'),
        ),
        body: Column(
          children: [
            TabBar(
              tabs: [
                Tab(text: 'Tab 1'),
                Tab(text: 'Tab 2'),
              ],
            ),
            Expanded(
              child: TabBarView(
                children: [
                  Container(
                    color: Colors.red,
                    child: Center(
                      child: Text('Tab 1 Content'),
                    ),
                  ),
                  Container(
                    color: Colors.blue,
                    child: Center(
                      child: Text('Tab 2 Content'),
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}