当我在页面上添加bottomNavigationBar时，页面的主体将消失。我相信该问题源于我从阅读过的其他帖子中获得的SingleChildScrollView的使用
我在底部导航栏中的何处呼叫似乎不再起作用
-homeScreen.dart
import 'package:flutter/material.dart';
import 'package:second_try/Widgets/headerHome.dart';
import 'package:second_try/Widgets/menuHome.dart';
import 'package:second_try/Widgets/businessesList.dart';
class homeScreen extends StatefulWidget {
homeScreen({Key key, this.title}) : super(key: key);
final String title;
@override
_homeScreen createState() => _homeScreen();
}
class _homeScreen extends State<homeScreen> {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(body: bodyHomePage()),
);
}
}
class bodyHomePage extends StatelessWidget {
const bodyHomePage({Key key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: SingleChildScrollView(
child: Column(children: <Widget>[
headerHome(),
homeMenu(),
businessesList(),
businessesList(),
]),
),
// bottomNavigationBar: bottomNavigation(),
),
);
}
}
-------------------------------------------------------------------------------------
headerHome
import 'package:flutter/material.dart';
class headerHome extends StatelessWidget {
const headerHome({Key key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.only(bottom: 10.0),
child: Container(
height: 140,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Stack(
alignment: Alignment.topCenter,
children: <Widget>[
Container(
height: 140,
color: Colors.white,
),
Container(
height: 120,
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [
Colors.deepPurple,
Colors.deepPurpleAccent,
],
),
boxShadow: [
BoxShadow(
color: Colors.black,
blurRadius: 10,
),
]),
),
Positioned(
top: 98,
child: Container(
width: 340,
height: 40,
decoration: BoxDecoration(
boxShadow: [
new BoxShadow(
color: Colors.blueGrey[900],
offset: new Offset(0.0, 8.0),
blurRadius: 20.0,
)
],
borderRadius: BorderRadius.all(Radius.circular(20)),
color: Colors.white,
),
child: Row(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Expanded(
child: Padding(
padding:
const EdgeInsets.only(top: 8, left: 10),
child: TextFormField(
decoration: InputDecoration(
border: InputBorder.none,
hintText: "What are you looking for?",
hintStyle:
TextStyle(color: Colors.grey[700]),
),
),
),
),
Container(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Align(
alignment: Alignment.centerRight,
child: Icon(Icons.search,
color: Colors.deepPurple)),
),
),
])),
),
Container(
height: 100,
padding: EdgeInsets.only(top: 25),
child: Row(
children: <Widget>[
Container(
padding: EdgeInsets.only(left: 30),
height: 35,
/* child: Image(
image: AssetImage(
'lib/assets/white-boardwalk-icon.png',
),
),*/
),
],
),
),
Container(
height: 100,
padding: EdgeInsets.only(top: 25),
child: Row(
children: <Widget>[
Expanded(
child: Center(
child: Container(
child: Text(
'Boardwalk',
style:
TextStyle(fontSize: 30, color: Colors.white),
),
),
),
),
],
),
),
],
),
],
),
),
);
}
}
-----------------------------------------------------------------------------------------------
businessList.dart
import 'package:flutter/material.dart';
class businessesList extends StatelessWidget {
const businessesList({Key key}) : super(key: key);
Padding businessCard(String category, IconData categoryIcon) {
return Padding(
padding: const EdgeInsets.symmetric(horizontal: 4),
child: Container(
margin: EdgeInsets.only(left: 21),
width: 200,
child: InkWell(
child: Column(
children: <Widget>[
Center(
child: Container(
height: 140,
width: 200,
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(14)),
gradient: LinearGradient(
colors: [Colors.deepPurple, Colors.deepPurpleAccent],
),
),
child: Icon(
categoryIcon,
size: 40.0,
color: Colors.white,
),
),
),
Padding(
padding: const EdgeInsets.only(top: 12),
child: Align(
alignment: Alignment.topLeft,
child: Text(
category,
style: TextStyle(
fontSize: 22,
),
),
),
),
Padding(
padding: const EdgeInsets.only(top: 6),
child: Row(
children: <Widget>[
Container(
alignment: Alignment.topLeft,
child: Icon(Icons.star, size: 16,)),
Container(
alignment: Alignment.topLeft,
child: Icon(Icons.star, size: 16,)),
Container(
alignment: Alignment.topLeft,
child: Icon(Icons.star, size: 16,)),
Container(
alignment: Alignment.topLeft,
child: Icon(Icons.star, size: 16,)),
Container(
alignment: Alignment.topLeft,
child: Icon(Icons.star, size: 16,)),
Padding(
padding: const EdgeInsets.only(left:6.0),
child: Text(
'(356)',
style: TextStyle(
fontSize: 14,
),
),
),
],
),
),
Padding(
padding: const EdgeInsets.only(top: 6),
child: Align(
alignment: Alignment.centerLeft,
child: Text(
'Sed ut perspiciatis unde omnis iste natus error sit',
style: TextStyle(
fontSize: 16,
),
),
),
),
],
),
),
));
}
@override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.only(top: 5.0),
child: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 6, bottom: 12.0),
child: Container(
height: 40,
child: Row(
children: <Widget>[
Container(
margin: EdgeInsets.only(left: 35),
alignment: Alignment.centerLeft,
child: Text(
'List Header',
style: TextStyle(fontSize: 24),
)),
Expanded(
child: SizedBox(),
),
Container(
margin: EdgeInsets.only(right: 35),
alignment: Alignment.centerRight,
child: Text(
'View All',
style: TextStyle(fontSize: 16),
))
],
),
),
),
Container(
height: 260,
width: 400,
child:
ListView(scrollDirection: Axis.horizontal, children: <Widget>[
businessCard('Home', Icons.home),
businessCard('Eat', Icons.restaurant_menu),
businessCard('Shop', Icons.store),
businessCard('Travel', Icons.airplanemode_active),
businessCard('Play', Icons.local_activity),
businessCard('Service', Icons.business),
]),
),
],
),
);
}
--------------------------------------------------------------------------------
bottomNavigation.dart
import 'package:flutter/material.dart';
class bottomNavigation extends StatelessWidget {
const bottomNavigation ({Key key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
bottomNavigationBar: BottomNavigationBar(
type: BottomNavigationBarType.fixed,
currentIndex: 1,
items: [
BottomNavigationBarItem(icon: Icon(Icons.arrow_drop_up,), title: Text("GLO",
style: TextStyle(color: Colors.black),),),
BottomNavigationBarItem(icon: Icon(Icons.arrow_drop_up), title:
Text("MTN"),),
BottomNavigationBarItem(icon: Icon(Icons.arrow_drop_up), title:
Text("Airtel"),),
BottomNavigationBarItem(icon: Icon(Icons.arrow_drop_up), title:
Text("Airtel"),),
],
),
),
);
}
}
I am expecting both the Pages Screen and the navigation bar to be view-able but the two are not working together at the moment
我没有收到任何错误消息
答案 0 :(得分：0)
_homeScreen，bodyHomePage和bottomNavigation构建方法返回MaterialApp-您只需要一个MaterialApp，在_homeScreen中，其余应该是小部件。 – 7分钟前的Melquiades
感谢您的快速帮助。如果我要在原始页面之外构建组件，则我需要致电MaterialApp。感谢您的快速修复！几天前才开始使用flutter