使用TabBarView的一个选项卡包含多个方法[Flutter]

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DefaultTabController(
        length: 3,
        child: Scaffold(
          appBar: AppBar(
            bottom: TabBar(
              tabs: [
                Tab(icon: Icon(Icons.directions_car)),
                Tab(icon: Icon(Icons.directions_transit)),
                Tab(icon: Icon(Icons.directions_bike)),
              ],
            ),
            title: Text('Tabs Demo'),
          ),
          body: TabBarView(
            children: [
              FirstTab(),
              SecondTab(),
              ThirdTab(),
            ],
          ),
        ),
      ),
    );
  }
}

class FirstTab extends StatefulWidget {
  @override
  _FirstTabState createState() => _FirstTabState();
}

class _FirstTabState extends State<FirstTab> {
  @override
  void initState() {
    super.initState();
    // 在这里执行初始化操作
    _loadData();
  }

  void _loadData() async {
    // 模拟数据加载
    await Future.delayed(Duration(seconds: 2));
    print('Data loaded');
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('First Tab'),
    );
  }
}

class SecondTab extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Second Tab'),
    );
  }
}

class ThirdTab extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Third Tab'),
    );
  }
}

class FirstTab extends StatefulWidget {
  @override
  _FirstTabState createState() => _FirstTabState();
}

class _FirstTabState extends State<FirstTab> with AutomaticKeepAliveClientMixin {
  @override
  bool get wantKeepAlive => true;

  @override
  void initState() {
    super.initState();
    _loadData();
  }

  void _loadData() async {
    await Future.delayed(Duration(seconds: 2));
    print('Data loaded');
  }

  @override
  Widget build(BuildContext context) {
    super.build(context); // 不要忘记调用super.build
    return Center(
      child: Text('First Tab'),
    );
  }
}