[英]How to change BottomNavigationBar background colour?
我用標簽欄制作了一個簡單的應用程序。 我需要將“底部導航欄”的背景顏色更改為藍色。 該應用程序的其余部分應為白色背景,導航欄應為藍色背景。 我應該怎么做? 在ThemeData中設置canvasColor無效。
這是我的代碼:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
State<StatefulWidget> createState(){
return MyAppState();
}
}
class MyAppState extends State<MyApp>{
int _selectedPage = 0;
final _pageOptions = [
Text('Item1'),
Text('Item2'),
Text('Item3')
];
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'sddsd',
theme: ThemeData(
primaryColor: Colors.blueAccent,
fontFamily: "Google Sans"
),
home: Scaffold(
appBar: AppBar(
title:Text("LQ2018"),
backgroundColor: Colors.blueAccent,
),
body: _pageOptions[_selectedPage],
bottomNavigationBar: BottomNavigationBar(
fixedColor: Colors.blueAccent,
currentIndex: _selectedPage,
onTap: (int index){
setState(() {
_selectedPage= index;
});
},
items: [
BottomNavigationBarItem(icon: Icon(Icons.supervised_user_circle), title: Text('Players')),
BottomNavigationBarItem(icon: Icon(Icons.whatshot), title: Text('Trending')),
BottomNavigationBarItem(icon: Icon(Icons.access_time), title: Text('Highlights'))
]
),
),
);
}
}
將BottomNavigationBar包裹在主題中,並在主題數據中設置canvasColor。 @override Widget build(BuildContext context) { return Scaffold( bottomNavigationBar: Theme( data: Theme.of(context).copyWith( canvasColor: Colors.blue, textTheme: Theme.of(context) .textTheme .copyWith(caption: TextStyle(color: Colors.black54))), child: BottomNavigationBar( type: BottomNavigationBarType.fixed, currentIndex: currentIndex, fixedColor: Colors.green, onTap: (value) {}, items: [ BottomNavigationBarItem( icon: Icon(Icons.add),), ], )), ); }
嘗試這個
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
State<StatefulWidget> createState(){
return MyAppState();
}
}
class MyAppState extends State<MyApp>{
int _selectedPage = 0;
final _pageOptions = [
Text('Item1'),
Text('Item2'),
Text('Item3')
];
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'sddsd',
theme: ThemeData(
primaryColor: Colors.blueAccent,
fontFamily: "Google Sans"
),
home: Scaffold(
appBar: AppBar(
title:Text("LQ2018"),
//backgroundColor: Colors.blueAccent,
),
body: _pageOptions[_selectedPage],
bottomNavigationBar: BottomNavigationBar(
//fixedColor: Colors.blueAccent,
type: BottomNavigationBarType.shifting,
currentIndex: _selectedPage,
onTap: (int index){
setState(() {
_selectedPage= index;
});
},
items: [
BottomNavigationBarItem(icon: Icon(Icons.supervised_user_circle), title: Text('Players'),backgroundColor: Colors.blueAccent),
BottomNavigationBarItem(icon: Icon(Icons.whatshot), title: Text('Trending'),backgroundColor: Colors.blueAccent),
BottomNavigationBarItem(icon: Icon(Icons.access_time), title: Text('Highlights'),backgroundColor: Colors.blueAccent)
]
),
),
);
}
}
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