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[英]Flutter - how to use SingleScrollView() to Scroll Entire Screen when Keyboard Appears not just text automatically
[英]Flutter screen appears empty when adding text field
我正在制作一个 flutter 应用程序,其中有一个文本并且它正在工作,但是之后当我添加一个文本字段时,我运行了该应用程序,我发现该应用程序是空的。
这是我的代码:
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(
home: new MyApp(),
));
}
class MyApp extends StatelessWidget {
@override
Scaffold c = Scaffold(
body: Padding(
padding: const EdgeInsets.only(top:30.0),
child: new Row(
children: <Widget>[
new TextField(
decoration: InputDecoration(
border: InputBorder.none,
hintText: 'Please enter a search term'
),
),
new Text(
'Text',
style: TextStyle(
fontSize: 20.0
),
),
],
),
),
);
@override
Widget build(BuildContext context) {
return c;
}
}
那是因为Row
容器不知道TextField
小部件的大小
这是你得到的错误:
following function, which probably computed the invalid constraints in question:
flutter: _RenderDecoration._layout.layoutLineBox
(package:flutter/src/material/input_decorator.dart:808:11)
flutter: The offending constraints were:
flutter: BoxConstraints(w=Infinity, 0.0<=h<=379.0)
为了解决这个问题,在他的父容器中给你的 Textfield 一个宽度,像这样:
Container(
width: 200.0,
child: new TextField(
decoration: InputDecoration(
border: InputBorder.none,
hintText: 'Please enter a search term'),
),
),
但它在你的屏幕上看起来很奇怪,所以你可以使用灵活作为你的TextField
和Text
父级来改进
Scaffold c = Scaffold(
body: Padding(
padding: const EdgeInsets.only(top:30.0),
child: new Row(
children: <Widget>[
Flexible(
flex: 1,
child: new TextField(
decoration: InputDecoration(
border: InputBorder.none,
hintText: 'Please enter a search term'
),
),
),
Flexible(
flex: 1,
child: new Text(
'Text',
style: TextStyle(
fontSize: 20.0
),
),
),
],
),
),
);
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