flutter:用底部导航栏切换页面

一，代码：

tabbar页面:

import 'package:flutter/material.dart';
import '../tabpages/MyHomePage.dart';
import '../tabpages/ProfilePage.dart';

class MyTabBar extends StatefulWidget {
  const MyTabBar({super.key});

  @override
  State<MyTabBar> createState() => _MyTabBarState();
}

class _MyTabBarState extends State<MyTabBar>
    with SingleTickerProviderStateMixin {
  final List<Widget> pages = const [MyHomePage(), ProfilePage()];
  late TabController _tabController;
  int _currentIndex = 0;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: pages.length, vsync: this);
    //去掉切换页面的动画 Duration.zero
    // _tabController = TabController(length: pages.length, animationDuration: Duration.zero, vsync: this);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: TabBarView(
          controller: _tabController,
          physics: const NeverScrollableScrollPhysics(),
          children: pages),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        selectedItemColor: Colors.red,
        onTap: (index) {
          setState(() {
            _tabController.index = index;
            _currentIndex = index;
          });
        },
        items: const [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            label: 'Profile',
          ),
        ],
      ),
    );
  }
}

第一个页面:

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> with AutomaticKeepAliveClientMixin {
  @override
  Widget build(BuildContext context) {
    print("Home build");
    super.build(context);
    return Scaffold(
      appBar: AppBar(
        title: const Text(
          "Home标题",
          style: TextStyle(color: Colors.white),
        ),
        centerTitle: true,
        backgroundColor: Colors.blue,
      ),
      body: const Center(
        child: Text("Home内容"),
      ),
    );
  }

  @override
  bool get wantKeepAlive => true;
}

第二个页面:

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> with AutomaticKeepAliveClientMixin {
  @override
  Widget build(BuildContext context) {
    print("Home build");
    super.build(context);
    return Scaffold(
      appBar: AppBar(
        title: const Text(
          "Home标题",
          style: TextStyle(color: Colors.white),
        ),
        centerTitle: true,
        backgroundColor: Colors.blue,
      ),
      body: const Center(
        child: Text("Home内容"),
      ),
    );
  }

  @override
  bool get wantKeepAlive => true;
}

 

二，效果: