Flutter

Question

我想知道如何添加一行，点击后其功能类似于底部导航栏上方的底部 Sheet。

喜欢这张图片Example

（较暗的行）。

谢谢！

Answer 1

Expanded Widget 应该可以解决您的问题。视频和文档位于 link。它应该允许一行 placed/pushed 到屏幕底部，以便它位于导航栏的“上方”。只需用扩展小部件包装您的小部件。

Answer 2

你可以使用一个名为 persistentFooterButtons 的脚手架属性，你可以向它添加一个小部件，这是应用程序的图像 https://i.stack.imgur.com/Tb4iA.jpg，这是代码用于制作应用程序。

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

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

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

class _MyAppState extends State<MyApp> {
  int _selectedIndex = 0;

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

  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,
    ),
  ];
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Container(
          color: Colors.white,
        ),

===================这就是你所需要的===================== =========

        persistentFooterButtons: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              IconButton(
                iconSize: 35,
                icon: Icon(Icons.play_arrow),
                onPressed: null,
              ),
              Container(child: Text("Some data over hereSome data ")),
              IconButton(
                icon: Icon(Icons.favorite),
                onPressed: null,
              )
            ],
          )
        ],

============================================= ====

        bottomNavigationBar: BottomNavigationBar(
          items: const <BottomNavigationBarItem>[
            BottomNavigationBarItem(
              icon: Icon(Icons.home),
              title: Text('Home'),
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.business),
              title: Text('Business'),
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.school),
              title: Text('School'),
            ),
          ],
          currentIndex: _selectedIndex,
          selectedItemColor: Colors.amber[800],
          onTap: _onItemTapped,
        ),
      ),
    );
  }
}

Flutter - 在底部导航栏上方添加一行

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