我正在制作一个带有选项卡的简单应用程序。我需要将底部导航栏的背景颜色更改为蓝色。其余部分应该是白色背景,导航栏应该是蓝色背景。我该怎么做?
在ThemeData中设置canvasColor并没有起作用。
这是我的代码:
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'))
]
),
),
);
}
}
backgroundColor
属性呢? 我猜它有一个被项目遮挡的背景?如果是这样,为什么将backgroundColor添加到单个项目会改变所有项目的颜色呢?从阅读文档(https://api.flutter.dev/flutter/material/BottomNavigationBar/backgroundColor.html)来看,这与“shifting”有关,但我仍然不太理解... - Thiemo