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在Flutter中如何样式化BottomNavigationBar

flutterdartflutter-layout
111

我正在尝试使用Flutter，并试图更改应用中BottomNavigationBar的颜色，但我只能实现更改BottomNavigationItem（图标和文本）的颜色。

以下是我声明BottomNavigationBar的地方：

class _BottomNavigationState extends State<BottomNavigationHolder>{

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: null,
      body: pages(),
      bottomNavigationBar:new BottomNavigationBar(
        items: <BottomNavigationBarItem>[
          new BottomNavigationBarItem(
              icon: const Icon(Icons.home),
              title: new Text("Home")
          ),
          new BottomNavigationBarItem(
              icon: const Icon(Icons.work),
              title: new Text("Self Help")
          ),
          new BottomNavigationBarItem(
              icon: const Icon(Icons.face),
              title: new Text("Profile")
          )
        ],
        currentIndex: index,
        onTap: (int i){setState((){index = i;});},
        fixedColor: Colors.white,
      ),
    );
  }

早些时候，我曾试图通过在我的主应用程序主题中将canvasColor编辑为绿色来解决问题，但它却破坏了整个应用程序的颜色方案。

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
        canvasColor: Colors.green
      ),
      home: new FirstScreen(),
    );
  }
}
我也想改变底部导航栏的很多东西，最终我只是复制了所有底部导航栏的代码并更改了我想要的内容。我想这就是Flutter的主要优点之一，即开放性和易于操作。我做了这个：https://pbs.twimg.com/media/DPkoxKWX0AEg9tF.jpg:large - Rene
13个回答
1

// 它将像这样工作背景颜色

（建议修改为：它将像这样设置背景颜色）
import 'package:flutter/material.dart';
import 'package:pedometer/widgets/const.dart';
import 'package:pedometer/widgets/const.dart';
import 'package:pedometer/widgets/const.dart';
import 'package:pedometer/widgets/icon.dart';

import 'dashbord.dart';

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

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  int _selectedIndex = 0;
  static const TextStyle optionStyle =
      TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
  static const List<Widget> _widgetOptions = <Widget>[
   DashbordScreen(),
  DashbordScreen(),
  DashbordScreen(),
  DashbordScreen(),
  ];

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: _widgetOptions.elementAt(_selectedIndex),
      ),
      bottomNavigationBar: BottomNavigationBar(
         backgroundColor: const Color.fromARGB(255, 6, 17, 93),
         type: BottomNavigationBarType.fixed,
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
           // iconFun(path:Icons.home,context: context )
            icon: Icon(Icons.home,color: Colors.white,size: 35,),
            label: 'Home',
          //  backgroundColor: Colors.red,
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.auto_graph_outlined,color: Colors.white,size: 35),
            label: 'Business',
            backgroundColor: Colors.green,
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.health_and_safety,color: Colors.white,size: 35),
            label: 'School',
           // backgroundColor: Colors.purple,
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.settings,color: Colors.white,size: 35),
            label: 'Settings',
         //   backgroundColor: Colors.pink,
          ),
        ],
        currentIndex: _selectedIndex,
        selectedItemColor: Colors.white,
        onTap: _onItemTapped,
      ),
    );
  }
}
1
只需将backgroundColor属性添加到BottomNavigationBar小部件即可。
@override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: null,
      body: pages(),
      bottomNavigationBar:new BottomNavigationBar(
        items: <BottomNavigationBarItem>[
          new BottomNavigationBarItem(
              icon: const Icon(Icons.home),
              title: new Text("Home")
          ),
          new BottomNavigationBarItem(
              icon: const Icon(Icons.work),
              title: new Text("Self Help")
          ),
          new BottomNavigationBarItem(
              icon: const Icon(Icons.face),
              title: new Text("Profile")
          )
        ],
        currentIndex: index,
        onTap: (int i){setState((){index = i;});},
        fixedColor: Colors.white,
        backgroundColor: Colors.black45,
      ),
    );
  }
0

使用

BottomNavigationBar (
backgroundColor: Colors.red,
)

如果使用这个材料小部件包装后颜色没有改变。

Material(
child:
BottomNavigationBar (
backgroundColor: Colors.red,
),
)
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