Flutter 中的抽屉到底部导航栏

Question

我最初有一个汉堡栏，它打开一个抽屉以在页面之间导航，我想将其更改为底部导航栏，但我有点挣扎。这是底部导航栏的代码：

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

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

/// This is the private State class that goes with MyStatefulWidget.
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  int _selectedIndex = 0;
  static const TextStyle optionStyle =
      TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
  static const List<Widget> _widgetOptions = <Widget>[
    Text(
      'Index 0: Home',
      style: optionStyle,
    ),
    Text(
      'Index 1: Business',
      style: optionStyle,
    ),
    Text(
      'Index 2: School',
      style: optionStyle,
    ),
  ];

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('BottomNavigationBar Sample'),
      ),
      body: Center(
        child: _widgetOptions.elementAt(_selectedIndex),
      ),
      bottomNavigationBar: BottomNavigationBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.business),
            label: 'Business',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.school),
            label: 'School',
          ),
        ],
        currentIndex: _selectedIndex,
        selectedItemColor: Colors.amber[800],
        onTap: _onItemTapped,
      ),
    );
  }
}

我的主页的所有代码都在这样的类中：

class FirstRoute extends StatefulWidget {
  FirstRoute({Key key, this.title}) : super(key: key);

  final String title;

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

class _FirstRoute extends State<FirstRoute> {
  @override
  Widget build(BuildContext context) {

而且我不明白如何将其放入底部导航栏中的小部件部分，Text() 部分所在的位置。 我是使用 Flutter 的新手，因此我们将不胜感激。

Answer 1

你要做的就是用你的小部件/屏幕替换文本小部件

例子

static  List<Widget> _widgetOptions = <Widget>[
    FirstRoute(),
    SecondRoute(),
    ThirdRoute(),    
  ];