Question

reg <- glob2rx(paste(c1,c2,c3,sep="*"))
print(reg)

[1] "^Curr Month.*Entity Lst Yr.*36008$"

我尝试使用新的Listview，但是不知道它出了什么问题，即使我将rinklewrap写为true，也总是显示一些错误，例如“ expected 1 arguments，但输入0”。

删除专栏对我也不起作用。

由于我仍在学习该语言，因此我尝试在互联网上寻找一些解决方案...我无法找出正确的书写方式

Answer 1

您似乎在括号不匹配方面遇到了一些问题。根据您的编辑器，有很多很棒的Dart＆Flutter插件可以提供帮助。我将您的代码粘贴到新的Flutter项目中，删除了流氓括号，然后将Scaffold主体更改为ListView。它产生您要求的行为。下面是这段代码。

import 'package:flutter/material.dart';

class SignupPage extends StatefulWidget {
  @override
  _SignupPageState createState() => _SignupPageState();
}

class _SignupPageState extends State<SignupPage> {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
        resizeToAvoidBottomPadding: false,
        body: ListView(
            // crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Container(
                child: Stack(
                  children: <Widget>[
                    Container(
                      padding: EdgeInsets.fromLTRB(16.0, 100.0, 0.0, 0.0),
                      child: Text(
                        'Signup',
                        style: TextStyle(
                            fontSize: 80.0, fontWeight: FontWeight.bold),
                      ),
                    ),
                    Container(
                      padding: EdgeInsets.fromLTRB(260.0, 105.0, 0.0, 0.0),
                      child: Text(
                        '.',
                        style: TextStyle(
                            fontSize: 80.0,
                            fontWeight: FontWeight.bold,
                            color: Colors.green),
                      ),
                    )
                  ],
                ),
              ),
              Container(
                  padding: EdgeInsets.only(top: 35.0, left: 20.0, right: 20.0),
                  child: Column(
                    children: <Widget>[
                      TextField(
                        decoration: InputDecoration(
                            labelText: 'Full Name',
                            labelStyle: TextStyle(
                                fontFamily: 'Montserrat',
                                fontWeight: FontWeight.bold,
                                color: Colors.grey),
                            // hintText: 'EMAIL',
                            // hintStyle: ,
                            focusedBorder: UnderlineInputBorder(
                                borderSide: BorderSide(color: Colors.green))),
                      ),
                      SizedBox(height: 10.0),
                      TextField(
                        decoration: InputDecoration(
                            labelText: 'Email Address ',
                            labelStyle: TextStyle(
                                fontFamily: 'Montserrat',
                                fontWeight: FontWeight.bold,
                                color: Colors.grey),
                            focusedBorder: UnderlineInputBorder(
                                borderSide: BorderSide(color: Colors.green))),
                        obscureText: true,
                      ),
                      SizedBox(height: 10.0),
                      TextField(
                        decoration: InputDecoration(
                            labelText: 'Confirm Email Address ',
                            labelStyle: TextStyle(
                                fontFamily: 'Montserrat',
                                fontWeight: FontWeight.bold,
                                color: Colors.grey),
                            focusedBorder: UnderlineInputBorder(
                                borderSide: BorderSide(color: Colors.green))),
                      ),
                      SizedBox(height: 10.0),
                      TextField(
                        decoration: InputDecoration(
                            labelText: 'Password',
                            labelStyle: TextStyle(
                                fontFamily: 'Montserrat',
                                fontWeight: FontWeight.bold,
                                color: Colors.grey),
                            focusedBorder: UnderlineInputBorder(
                                borderSide: BorderSide(color: Colors.green))),
                        obscureText: true,
                      ),
                      SizedBox(height: 10.0),
                      TextField(
                        decoration: InputDecoration(
                            labelText: 'Phone Number ',
                            labelStyle: TextStyle(
                                fontFamily: 'Montserrat',
                                fontWeight: FontWeight.bold,
                                color: Colors.grey),
                            focusedBorder: UnderlineInputBorder(
                                borderSide: BorderSide(color: Colors.green))),
                        obscureText: true,
                      ),
                      SizedBox(height: 50.0),
                      Container(
                        height: 40.0,
                        child: Material(
                          borderRadius: BorderRadius.circular(20.0),
                          shadowColor: Colors.greenAccent,
                          color: Colors.green,
                          elevation: 7.0,
                          child: GestureDetector(
                            onTap: () {},
                            child: Center(
                              child: Text(
                                'SIGNUP',
                                style: TextStyle(
                                    color: Colors.white,
                                    fontWeight: FontWeight.bold,
                                    fontFamily: 'Montserrat'),
                              ),
                            ),
                          ),
                        )
                      ),
                      SizedBox(height: 20.0),
                      Container(
                        height: 40.0,
                        color: Colors.transparent,
                        child: Container(
                          decoration: BoxDecoration(
                              border: Border.all(
                                  color: Colors.black,
                                  style: BorderStyle.solid,
                                  width: 1.0),
                              color: Colors.transparent,
                              borderRadius: BorderRadius.circular(20.0)),
                          child: InkWell(
                            onTap: () {
                              Navigator.of(context).pop();
                            },
                            child: Center(
                              child: Text('Go Back',
                                  style: TextStyle(
                                      fontWeight: FontWeight.bold,
                                      fontFamily: 'Montserrat')),
                            ),
                          ),
                        ),
                      ),
                    ],
                  )
              ),
            ]
        )
     );
  }
}

展望未来，我建议使用drtfmt来帮助实现代码格式的一致性。我注意到缩进不一致，并且尾随逗号也不一致。在学习语言时，使用扩展名，短子和格式化程序将真正有帮助！祝你好运！

如何使列可滚动？扑朔迷离

1 个答案: