GridView.builder is not scrolling

Question

我有这段代码，我正在努力使这个网格视图可以滚动，无论我做什么，它都不会滚动。我一直收到这个renderoverflow错误。我试着把它包装在SingleChildScroll视图和physics:ScrollPhysics((的属性中，但什么都不起作用。我只需要让这个gridView可以滚动，而不是它下面的文本。我已经尝试了几种方法，但到目前为止都不适用。我可能在这里犯了一个愚蠢的错误，但无法解决。编辑：当我在scaffold的body标记之后设置singleChildScrollView时，它工作得很好，但当我将其应用于GridView时不工作。

class _CartGridViewState extends State<CartGridView> {
@override
Widget build(BuildContext context) {
final User user = FirebaseAuth.instance.currentUser;
double sum = 0;
print(user);
return StreamBuilder(
stream: FirebaseFirestore.instance
.collection('Users')
.doc(user.uid)
.collection('Cart')
.snapshots(),
builder: (BuildContext context, snapshot) {
if (!snapshot.hasData) {
return Center(
child: CircularProgressIndicator(),
);
}
var document = snapshot.data.docs;
return Padding(
padding: const EdgeInsets.all(10.0),
child: SingleChildScrollView(
physics: ScrollPhysics(),
child: GridView.builder(
physics: ScrollPhysics(),
scrollDirection: Axis.vertical,
primary: false,
shrinkWrap: true,
itemCount: document.length,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2,
childAspectRatio: MediaQuery.of(context).size.height / 800,
),
itemBuilder: (context, index) {
if (document[index].data()["name"] == null) {
return Text('There are $index items in cart');
} else {
return Card(
child: GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => CartView(
document[index].data()["name"],
document[index]
.data()["price"]
.toDouble(),
document[index].data()["image"],
index,
)),
);
},
child: Stack(children: [
ListView(physics: ScrollPhysics(), children: [
Hero(
tag: 'tagImage$index',
child: Image.network(
"${document[index].data()["image"]}",
height: 150,
),
),
Center(
child: Text(
"Price ${document[index].data()["price"]}")),

]),
DeleteCartItems(index),
]),
),
);
}
}),
),
);
},
);

}
}

Answer 1

我们可以使用扩展的小部件来获得可滚动的GridView请参考以下代码

import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
List<String> images = [
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
"https://images.unsplash.com/photo-1614961234425-dedd96e5e699?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxleHBsb3JlLWZlZWR8M3x8fGVufDB8fHw%3D&auto=format&fit=crop&w=500&q=60",
];
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Padding(
padding: EdgeInsets.symmetric(
horizontal: 12.0,
),
child: Expanded(
child: GridView.builder(
itemCount: images.length,
shrinkWrap: true,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2,
crossAxisSpacing: 8.0,
mainAxisSpacing: 10.0),
itemBuilder: (BuildContext context, int index) {
return Image.network(images[index]);
},
),
),
),
);
}
}