Flutter:如何在每次访问页面时在底部导航栏上重新加载页面

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
      routes: {
        '/page1': (context) => Page1(),
        '/page2': (context) => Page2(),
        '/page3': (context) => Page3(),
      },
    );
  }
}

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

class _MyHomePageState extends State<MyHomePage> {
  int _currentIndex = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Demo'),
      ),
      body: IndexedStack(
        index: _currentIndex,
        children: [
          Navigator(
            onGenerateRoute: (settings) {
              return MaterialPageRoute(
                builder: (context) => Page1(),
              );
            },
          ),
          Navigator(
            onGenerateRoute: (settings) {
              return MaterialPageRoute(
                builder: (context) => Page2(),
              );
            },
          ),
          Navigator(
            onGenerateRoute: (settings) {
              return MaterialPageRoute(
                builder: (context) => Page3(),
              );
            },
          ),
        ],
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        onTap: (index) {
          setState(() {
            _currentIndex = index;
          });
        },
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Page 1',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.search),
            label: 'Page 2',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.settings),
            label: 'Page 3',
          ),
        ],
      ),
    );
  }
}

class Page1 extends StatefulWidget {
  @override
  _Page1State createState() => _Page1State();
}

class _Page1State extends State<Page1> {
  @override
  void initState() {
    super.initState();
    // 在每次访问页面时重新加载页面的逻辑
    loadData();
  }

  void loadData() {
    // 加载数据的操作
    // ...
  }

  @override
  void dispose() {
    // 页面被销毁前的清理操作
    // ...
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text('Page 1'),
      ),
    );
  }
}

class Page2 extends StatefulWidget {
  @override
  _Page2State createState() => _Page2State();
}

class _Page2State extends State<Page2> {
  @override
  void initState() {
    super.initState();
    // 在每次访问页面时重新加载页面的逻辑
    loadData();
  }

  void loadData() {
    // 加载数据的操作
    // ...
  }

  @override
  void dispose() {
    // 页面被销毁前的清理操作
    // ...
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text('Page 2'),
      ),
    );
  }
}

class Page3 extends StatefulWidget {
  @override
  _Page3State createState() => _Page3State();
}

class _Page3State extends State<Page3> {
  @override
  void initState() {
    super.initState();
    // 在每次访问页面时重新加载页面的逻辑
    loadData();
  }

  void loadData() {
    // 加载数据的操作
    // ...
  }

  @override
  void dispose() {
    // 页面被销毁前的清理操作
    // ...
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text('Page 3'),
      ),
    );
  }
}