开发app时对手机页面的使用，就会要使用到tab分页功能

主要页面代码如下：

class Tabs extends StatefulWidget {
  Tabs({Key? key}) : super(key: key);

  @override
  _TabsState createState() => _TabsState();
}

class _TabsState extends State<Tabs> {
  int _currentIndex = 0;
  List<Widget> _currentPage = [HomePage(), Settings(), Search()];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: this._currentPage[this._currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: "首页",
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.settings),
            label: "设置",
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.search),
            label: "搜索",
          ),
        ],
        onTap: (int index) {
          setState(() {
            this._currentIndex = index;
          });
        },
        fixedColor: Colors.red,
        type: BottomNavigationBarType.fixed,
      ),
    );
  }
}

上述代码是对底部导航栏进行命名

另外还需要新建几个分页面：

• HomePage

class HomePage extends StatefulWidget {
  HomePage({Key? key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        ElevatedButton(
          child: Text("跳转搜索页面"),
          onPressed: () {
            Navigator.of(context)
                .push(MaterialPageRoute(builder: (context) => Search()));
          },
        ),
        SizedBox(
          height: 10.0,
        ),
        ElevatedButton(
          child: Text("跳转到表单页面并传值"),
          onPressed: () {
            Navigator.of(context).push(
                MaterialPageRoute(builder: (context) => FormPage(title: "hahah")));
          },
        ),
      ],
    );
  }
}

• Settings

class Settings extends StatefulWidget {
  Settings({Key? key}) : super(key: key);

  @override
  _SettingsState createState() => _SettingsState();
}

class _SettingsState extends State<Settings> {
  @override
  Widget build(BuildContext context) {
    return ListView(
      children: [
        ListTile(
          title: Text("我是一个文本"),
        ),
        ListTile(
          title: Text("我是一个文本"),
        ),
        ListTile(
          title: Text("我是一个文本"),
        ),
      ],
    );
  }
}

• Search

class Search extends StatefulWidget {
  Search({Key? key}) : super(key: key);

  @override
  _SearchState createState() => _SearchState();
}

class _SearchState extends State<Search> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("我是搜索页面"),
      ),
      body: Text("内容区域"),
    );
  }
}

这样就可以实现tab效果,

image.png