小编Gab*_*tos的帖子

第一次启动应用程序时出现错误，所有文本字段都在验证，但一定不是这样的，我从 flutter 文档中获取了表单示例，并添加了 autovalidate:true，表面上在网络上它可以工作，但带有物理设备和模拟器无法正常工作，错误和代码如下

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
 @override
 Widget build(BuildContext context) {
   final appTitle = 'Form Validation Demo';

   return MaterialApp(
    title: appTitle,
    home: Scaffold(
     appBar: AppBar(
       title: Text(appTitle),
     ),
     body: MyCustomForm(),
   ),
  );
 }
}

class MyCustomForm extends StatefulWidget {
  @override
  MyCustomFormState createState() {
    return MyCustomFormState();
  }
}


class MyCustomFormState extends State<MyCustomForm> {

 final _formKey = GlobalKey<FormState>();

 @override
 Widget build(BuildContext context) {

  return Form(
    autovalidate:true,
    key: _formKey,
    child: Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: …