我正在尝试构建一个相当简单的Flutter表单,它由三行组成,其中前两行每行包含三列。因此,我制作了一个表单,其中包含一个作为子元素的填充,而这个填充包含一个作为子元素的列,它最终包含三行: Widget build(BuildContext context) {
// Build a Form widget using the _formKey created above.
return Form(
key: _formKey,
child: Padding(
padding: EdgeInsets.all(16.0),
当我试图在flutter中打开一个屏幕时,我得到了这个错误 The overflowing RenderFlex has an orientation of Axis.vertical.
I/flutter ( 9632): The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
I/flutter ( 9632): black striped pattern. This is usually caused by the contents being t
我只是在Flutter中创建一个窗体。我无法设置按钮的上边距。 class _MyHomePageState extends State {
String firstname;
String lastname;
final scaffoldKey = new GlobalKey();
final formKey = new GlobalKey();
@override
Widget build(BuildContext context) {
return new Scaffold(
key: scaffoldKey,
appBar: new
我正在尝试获取用户id,并使用firestore检查flutter中是否存在,但我没有得到正确的结果。
handlesearch() {
final form = formkey.currentState;
final Future<QuerySnapshot> result = Firestore.instance
.collection('users')
.where('userid', isEqualTo: form)
.getDocuments();
setState(
android演播室3.6
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
theme: new ThemeData(
primaryColor: new Color(Constants.COLO
所以基本上我对飞镖和飞镖都是新手。问题是,当我向用户询问url输入,然后从输入链接中获取OpenGraph数据,并试图用TextFormFields和initialValu显示一个新列时,我从url的开放图中得到了什么
我尝试用新数据设置TextFormField controller.text,也尝试设置用户按submit按钮时设置的var,但是我一直收到有关它的错误。
════════════════════════════════════════════════════════════════════════════════
Reloaded 5 of 635 libraries in
我正在使用VS代码在flutter中设置一个TextField小部件,我在TextFormField上得到了这个错误:
No Material widget found.
TextField widgets require a Material widget ancestor.
I/flutter ( 3827): In material design, most widgets are conceptually "printed" on a sheet of material. In Flutter's
I/flutter ( 3827): material libr
我试图使用Globalkey的当前状态打印TextField的当前值,如下所示:
GlobalkeyName.currentState.value
当我在状态小部件中这样做时,我没有问题,但是当我试图在showModalBottomSheet中做同样的事情时,我得到了一个错误
The getter 'currentState' isn't defined for the class 'Key'.
P.S:我知道如何使用TextEditingController --不要这么说。
完整源代码如下
import 'package:flutter/ma
我试着做一个我在这里画的设计:
我现在的代码是:
@override
Widget build(BuildContext context) {
// Build a Form widget using the _formKey we created above
return Form(
key: _formKey,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[