我正在尝试 Flutter,我正在尝试更改应用程序上 BottomNavigationBar
的颜色,但我所能实现的只是更改 BottomNavigationItem
的颜色(图标和文字)。
这是我声明我的 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,
),
);
}
之前我以为我可以通过在我的主应用主题上将 canvasColor
编辑为绿色来解决这个问题,但它弄乱了整个应用的配色方案:
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(),
);
}
}
最佳答案
没有指定BottomNavigationBar
的背景颜色的选项,只能更改canvasColor
。在不弄乱整个应用程序的情况下实现它的一种方法是将 BottomNavigationBar
包装在带有所需 canvasColor
的 Theme
中。
例子:
bottomNavigationBar: new Theme(
data: Theme.of(context).copyWith(
// sets the background color of the `BottomNavigationBar`
canvasColor: Colors.green,
// sets the active color of the `BottomNavigationBar` if `Brightness` is light
primaryColor: Colors.red,
textTheme: Theme
.of(context)
.textTheme
.copyWith(caption: new TextStyle(color: Colors.yellow))), // sets the inactive color of the `BottomNavigationBar`
child: new BottomNavigationBar(
type: BottomNavigationBarType.fixed,
currentIndex: 0,
items: [
new BottomNavigationBarItem(
icon: new Icon(Icons.add),
title: new Text("Add"),
),
new BottomNavigationBarItem(
icon: new Icon(Icons.delete),
title: new Text("Delete"),
)
],
),
),
希望有帮助!
https://stackoverflow.com/questions/49307858/