【发布时间】：2020-12-09 02:27:55
【问题描述】：
我是 Flutter 的新手，我尝试制作可滚动的 UI。
我尝试添加 Expanded 小部件、ListViews Widgets、SingleChildScrollView 小部件，但没有得到预期的结果。
另外，我尝试将堆栈包装在 Container 中，然后再包装在 SingleChildScrollView 中。但它会引发错误。
我尝试了很多方面来使我的主页可滚动。但是，我得到了错误（下面提到）
I/flutter ( 6259): Another exception was thrown: RenderBox was not laid out: RenderSemanticsGestureHandler#e1279 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (6259)：引发另一个异常：RenderBox 未布置：_RenderColoredBox#89cc6 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE I/flutter（6259）：引发另一个异常：未布置 RenderBox：RenderRepaintBoundary#9505f NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE I/flutter（6259）：引发了另一个异常：'package:flutter/src/rendering/sliver_multi_box_adaptor.dart'：断言失败：第 549 行 pos 12：'child.hasSize'：不正确。
GestureDetector(
onTap: () {
FocusScope.of(context).unfocus();
new TextEditingController().clear();
},
child: Stack(
children: <Widget>[
Container(
height: 200,
child: TopBar(),
),
Container(
margin: EdgeInsets.only(top: 55),
child: Text(
"PriceTrackers",
style: TextStyle(
color: Colors.white,
fontSize: 50.0,
fontWeight: FontWeight.w900,
),
),
),
Container(
margin: EdgeInsets.fromLTRB(265, 0, 0, 0),
child: Text(
".",
style: TextStyle(
fontSize: 120,
color: Colors.white,
),
)),
ListView(
padding: EdgeInsets.fromLTRB(10, 10, 10, 0),
children: <Widget>[
Container(
margin: EdgeInsets.only(top: 200),
child: Form(
key: _formKey,
child: Column(children: <Widget>[
Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Icon(Icons.store),
Text(
"Supported Store",
style: TextStyle(
fontSize: 20,
color: Colors.green,
),
),
Image.asset(
"Assets/img/amazon.png",
width: 20,
),
Image.asset(
"Assets/img/flipkart.png",
width: 20,
),
Image.asset(
"Assets/img/ajio.png",
width: 20,
),
Image.asset(
"Assets/img/snapdeal.png",
width: 20,
),
Image.asset(
"Assets/img/ss.jpg",
width: 20,
),
],
),
margin: EdgeInsets.fromLTRB(40, 10, 40, 10),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
color: Colors.white,
// boxShadow: [
// BoxShadow(color: Colors.white, spreadRadius: 3),
// ],
),
),
// Add TextFormFields and RaisedButton here.
TextFormField(
controller: _controller,
enableInteractiveSelection: true,
textInputAction: TextInputAction.done,
decoration: InputDecoration(
border: OutlineInputBorder(
borderSide: BorderSide(color: Colors.green),
borderRadius: BorderRadius.circular(20),
),
enabledBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.black),
borderRadius: BorderRadius.circular(20),
),
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.blue),
borderRadius: BorderRadius.circular(20),
),
errorBorder: OutlineInputBorder(
borderSide: BorderSide(
color: Colors.red,
),
borderRadius: BorderRadius.circular(20),
),
hintText: "Enter Product URL",
suffixIcon: Icon(Icons.search),
),
// onFieldSubmitted: (term){
// FocusScope.of(context).unfocus();
// _controller.clear();
// },
showCursor: true,
autofocus: false,
// The validator receives the text that the user has entered.
validator: (value) {
if (value.isEmpty) {
return 'Please enter some text';
} else if (!value.contains("amazon") ||
!value.contains("flipkart") ||
!value.contains("myntra")) {
return "Please Enter Supported Store URL";
}
return null;
},
),
RaisedButton.icon(
icon: Icon(
Icons.search,
color: Colors.white,
),
color: Colors.black,
padding: EdgeInsets.fromLTRB(10, 0, 10, 0),
elevation: 20.0,
onPressed: () async {
// Validate returns true if the form is valid, otherwise false.
if (_formKey.currentState.validate()) {
setState(() {
createAlbum(_controller.text).then((value) => {
Navigator.push(
context,
EnterExitRoute(
exitPage: HomePage(),
enterPage: LineChartSample2(
getData: value)))
});
});
Scaffold.of(context).showSnackBar(SnackBar(
content: Text(
'Processing Data',
style: TextStyle(color: Colors.white),
),
backgroundColor: Colors.green,
));
// If the form is valid, display a snackbar. In the real world,
// you'd often call a server or save the information in a database.
// Navigator.push(
// context,
// MaterialPageRoute(builder: (context) => LineChartSample2()),
// );
}
},
label: Text(
'View Price Graph',
style: TextStyle(
color: Colors.white,
),
),
),
Container(
margin: EdgeInsets.only(top: 20),
width: 380,
height: 200,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20),
color: Colors.white,
boxShadow: [
BoxShadow(
color: Colors.blue[200],
blurRadius: 25.0, // soften the shadow
spreadRadius: 5.0, //extend the shadow
offset: Offset(
15.0, // Move to right 10 horizontally
15.0, // Move to bottom 10 Vertically
),
)
],
),
child: Row(
children: <Widget>[
Container(
width: 130,
height: 130,
padding: EdgeInsets.fromLTRB(5, 10, 5, 10),
child: FadeInImage(
fit: BoxFit.scaleDown,
// here `bytes` is a Uint8List containing the bytes for the in-memory image
placeholder: AssetImage("Assets/img/bag.png"),
image: NetworkImage(
'https://images-na.ssl-images-amazon.com/images/I/81j14WXbc%2BL._UL1500_.jpg'),
),
),
Expanded(
child: Container(
padding: EdgeInsets.fromLTRB(0, 20, 10, 0),
child: Column(
children: <Widget>[
Text(
"Redux Analogue Blue Dial Men’s &S... ",
maxLines: 2,
softWrap: true,
style: TextStyle(
fontSize: 20,
fontWeight: FontWeight.w400,
color: Colors.black),
),
Container(
margin: EdgeInsets.fromLTRB(0, 10, 0, 0),
child: Column(
children: <Widget>[
OutlineButton.icon(
onPressed: () => {},
icon: Icon(Icons.shopping_basket),
label: Text("But Now @28939")),
Row(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
children: <Widget>[
Text(
"Avg Price : 7,98,374",
style: TextStyle(
fontSize: 10,
fontWeight: FontWeight.w900,
),
),
Text(
"Avg Price :34,43,343",
style: TextStyle(
fontSize: 10,
fontWeight: FontWeight.w900,
),
)
],
),
Container(
margin: EdgeInsets.all(5),
),
FlatButton.icon(
icon: Icon(Icons.show_chart),
color: Colors.black,
textColor: Colors.white,
disabledColor: Colors.grey,
disabledTextColor: Colors.black,
padding: EdgeInsets.fromLTRB(
20, 5, 20, 5),
splashColor: Colors.blueAccent,
onPressed: () {
/*...*/
},
label: Text(
"Show Price Graph",
style: TextStyle(fontSize: 15.0),
),
)
],
)),
],
),
))
],
),
),
])),
),
],
),
Container(
margin: EdgeInsets.only(top: 650),
child: GridView.count(
primary: false,
padding: const EdgeInsets.all(20),
crossAxisSpacing: 10,
mainAxisSpacing: 10,
crossAxisCount: 2,
children: <Widget>[
Container(
padding: const EdgeInsets.all(8),
child: const Text("He'd have you all unravel at the"),
color: Colors.teal[100],
),
Container(
padding: const EdgeInsets.all(8),
child: const Text('Heed not the rabble'),
color: Colors.teal[200],
),
Container(
padding: const EdgeInsets.all(8),
child: const Text('Sound of screams but the'),
color: Colors.teal[300],
),
Container(
padding: const EdgeInsets.all(8),
child: const Text('Who scream'),
color: Colors.teal[400],
),
Container(
padding: const EdgeInsets.all(8),
child: const Text('Revolution is coming...'),
color: Colors.teal[500],
),
Container(
padding: const EdgeInsets.all(8),
child: const Text('Revolution, they...'),
color: Colors.teal[600],
),
],
)),
],
));
【问题讨论】：
标签： flutter flutter-layout flutter-listview flutter-pageview flutter-gridview