嗨，我试图建立一个登录屏幕的Flutter，但我得到以下错误时，打开它。
找不到材质小部件文本域小部件需要材质小部件祖先

import 'package:flutter/material.dart';

 Widget LoginPage() {
    return new Container(
      height: MediaQuery.of(context).size.height,
      decoration: BoxDecoration(
        color: Colors.white,
        image: DecorationImage(
          colorFilter: new ColorFilter.mode(
              Colors.black.withOpacity(0.05), BlendMode.dstATop),
          image: AssetImage('assets/images/mountains.jpg'),
          fit: BoxFit.cover,
        ),
      ),
      child: new Column(
        children: <Widget>[
          Container(
            padding: EdgeInsets.all(120.0),
            child: Center(
              child: Icon(
                Icons.headset_mic,
                color: Colors.redAccent,
                size: 50.0,
              ),
            ),
          ),
          new Row(
            children: <Widget>[
              new Expanded(
                child: new Padding(
                  padding: const EdgeInsets.only(left: 40.0),
                  child: new Text(
                    "EMAIL",
                    style: TextStyle(
                      fontWeight: FontWeight.bold,
                      color: Colors.redAccent,
                      fontSize: 15.0,
                    ),
                  ),
                ),
              ),
            ],
          ),
          new Container(
            width: MediaQuery.of(context).size.width,
            margin: const EdgeInsets.only(left: 40.0, right: 40.0, top: 10.0),
            alignment: Alignment.center,
            decoration: BoxDecoration(
              border: Border(
                bottom: BorderSide(
                    color: Colors.redAccent,
                    width: 0.5,
                    style: BorderStyle.solid),
              ),
            ),
            padding: const EdgeInsets.only(left: 0.0, right: 10.0),
            child: new Row(
              crossAxisAlignment: CrossAxisAlignment.center,
              mainAxisAlignment: MainAxisAlignment.start,
              children: <Widget>[
                new Expanded(
                  child: TextField(
                    obscureText: true,
                    textAlign: TextAlign.left,
                    decoration: InputDecoration(
                      border: InputBorder.none,
                      hintText: 'samarthagarwal@live.com',
                      hintStyle: TextStyle(color: Colors.grey),
                    ),
                  ),
                ),
              ],
            ),
          ),
          Divider(
            height: 24.0,
          ),
          new Row(
            children: <Widget>[
              new Expanded(
                child: new Padding(
                  padding: const EdgeInsets.only(left: 40.0),
                  child: new Text(
                    "PASSWORD",
                    style: TextStyle(
                      fontWeight: FontWeight.bold,
                      color: Colors.redAccent,
                      fontSize: 15.0,
                    ),
                  ),
                ),
              ),
            ],
          ),
          new Container(
            width: MediaQuery.of(context).size.width,
            margin: const EdgeInsets.only(left: 40.0, right: 40.0, top: 10.0),
            alignment: Alignment.center,
            decoration: BoxDecoration(
              border: Border(
                bottom: BorderSide(
                    color: Colors.redAccent,
                    width: 0.5,
                    style: BorderStyle.solid),
              ),
            ),
            padding: const EdgeInsets.only(left: 0.0, right: 10.0),
            child: new Row(
              crossAxisAlignment: CrossAxisAlignment.center,
              mainAxisAlignment: MainAxisAlignment.start,
              children: <Widget>[
                new Expanded(
                  child: TextField(
                    obscureText: true,
                    textAlign: TextAlign.left,
                    decoration: InputDecoration(
                      border: InputBorder.none,
                      hintText: '*********',
                      hintStyle: TextStyle(color: Colors.grey),
                    ),
                  ),
                ),
              ],
            ),
          ),
          Divider(
            height: 24.0,
          ),
          new Row(
            mainAxisAlignment: MainAxisAlignment.end,
            children: <Widget>[
              Padding(
                padding: const EdgeInsets.only(right: 20.0),
                child: new FlatButton(
                  child: new Text(
                    "Forgot Password?",
                    style: TextStyle(
                      fontWeight: FontWeight.bold,
                      color: Colors.redAccent,
                      fontSize: 15.0,
                    ),
                    textAlign: TextAlign.end,
                  ),
                  onPressed: () => {},
                ),
              ),
            ],
          ),
          new Container(
            width: MediaQuery.of(context).size.width,
            margin: const EdgeInsets.only(left: 30.0, right: 30.0, top: 20.0),
            alignment: Alignment.center,
            child: new Row(
              children: <Widget>[
                new Expanded(
                  child: new FlatButton(
                    shape: new RoundedRectangleBorder(
                      borderRadius: new BorderRadius.circular(30.0),
                    ),
                    color: Colors.redAccent,
                    onPressed: () => {},
                    child: new Container(
                      padding: const EdgeInsets.symmetric(
                        vertical: 20.0,
                        horizontal: 20.0,
                      ),
                      child: new Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: <Widget>[
                          new Expanded(
                            child: Text(
                              "LOGIN",
                              textAlign: TextAlign.center,
                              style: TextStyle(
                                  color: Colors.white,
                                  fontWeight: FontWeight.bold),
                            ),
                          ),
                        ],
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),
          new Container(
            width: MediaQuery.of(context).size.width,
            margin: const EdgeInsets.only(left: 30.0, right: 30.0, top: 20.0),
            alignment: Alignment.center,
            child: Row(
              children: <Widget>[
                new Expanded(
                  child: new Container(
                    margin: EdgeInsets.all(8.0),
                    decoration: BoxDecoration(border: Border.all(width: 0.25)),
                  ),
                ),
                Text(
                  "OR CONNECT WITH",
                  style: TextStyle(
                    color: Colors.grey,
                    fontWeight: FontWeight.bold,
                  ),
                ),
                new Expanded(
                  child: new Container(
                    margin: EdgeInsets.all(8.0),
                    decoration: BoxDecoration(border: Border.all(width: 0.25)),
                  ),
                ),
              ],
            ),
          ),
          new Container(
            width: MediaQuery.of(context).size.width,
            margin: const EdgeInsets.only(left: 30.0, right: 30.0, top: 20.0),
            child: new Row(
              children: <Widget>[
                new Expanded(
                  child: new Container(
                    margin: EdgeInsets.only(right: 8.0),
                    alignment: Alignment.center,
                    child: new Row(
                      children: <Widget>[
                        new Expanded(
                          child: new FlatButton(
                            shape: new RoundedRectangleBorder(
                              borderRadius: new BorderRadius.circular(30.0),
                            ),
                            color: Color(0Xff3B5998),
                            onPressed: () => {},
                            child: new Container(
                              child: new Row(
                                mainAxisAlignment: MainAxisAlignment.center,
                                children: <Widget>[
                                  new Expanded(
                                    child: new FlatButton(
                                      padding: EdgeInsets.only(
                                        top: 20.0,
                                        bottom: 20.0,
                                      ),
                                      child: new Row(
                                        mainAxisAlignment:
                                        MainAxisAlignment.spaceEvenly,
                                        children: <Widget>[
                                          Icon(
                                            const IconData(0xea90,
                                                fontFamily: 'icomoon'),
                                            color: Colors.white,
                                            size: 15.0,
                                          ),
                                          Text(
                                            "FACEBOOK",
                                            textAlign: TextAlign.center,
                                            style: TextStyle(
                                                color: Colors.white,
                                                fontWeight: FontWeight.bold),
                                          ),
                                        ],
                                      ),
                                    ),
                                  ),
                                ],
                              ),
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
                new Expanded(
                  child: new Container(
                    margin: EdgeInsets.only(left: 8.0),
                    alignment: Alignment.center,
                    child: new Row(
                      children: <Widget>[
                        new Expanded(
                          child: new FlatButton(
                            shape: new RoundedRectangleBorder(
                              borderRadius: new BorderRadius.circular(30.0),
                            ),
                            color: Color(0Xffdb3236),
                            onPressed: () => {},
                            child: new Container(
                              child: new Row(
                                mainAxisAlignment: MainAxisAlignment.center,
                                children: <Widget>[
                                  new Expanded(
                                    child: new FlatButton(
                                      padding: EdgeInsets.only(
                                        top: 20.0,
                                        bottom: 20.0,
                                      ),
                                      child: new Row(
                                        mainAxisAlignment:
                                        MainAxisAlignment.spaceEvenly,
                                        children: <Widget>[
                                          Icon(
                                            const IconData(0xea88,
                                                fontFamily: 'icomoon'),
                                            color: Colors.white,
                                            size: 15.0,
                                          ),
                                          Text(
                                            "GOOGLE",
                                            textAlign: TextAlign.center,
                                            style: TextStyle(
                                                color: Colors.white,
                                                fontWeight: FontWeight.bold),
                                          ),
                                        ],
                                      ),
                                    ),
                                  ),
                                ],
                              ),
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
              ],
            ),
          )
        ],
      ),
    );
  }

有人知道怎么解决吗？

6条答案

按热度按时间

axzmvihb1#

错误指出**TextField小部件需要一个Material小部件祖先。只需将整个loginWidget Package **到Scaffold中即可解决此问题。

Widget LoginPage() {
   return new Scaffold(body: *your whole code*)
}

赞(0）回复(0）举报 2023-01-18

cngwdvgl2#

只需使用这样的材质 Package 您的小部件：

@override
Widget build(BuildContext context) {
  return Material(
    child: YourAwesomeWidget(),
}

w8f9ii693#

由于大多数小部件要求材质小部件作为其父小部件
您最好在小工具树的顶部使用Material()或Scaffold()小工具，然后继续编写代码。

@override
Widget build(BuildContext context) {
  return Material(
    child: body(),
}

或

@override
Widget build(BuildContext context) {
  return Scaffold(
    child: body(),
}

z0qdvdin4#

用Scaffold或MaterialApp Package loginpage函数

Widget LoginPage() {
  return new Scaffold(
    body: Container(
      *the rest of your code*
    ),
  );
}

Widget LoginPage() {
  return new MaterialApp(
    home: Container(
      *the rest of your code*
    ),
  );
}

8yparm6h5#

我也遇到了同样的问题。始终记得输入Scaffold，记住它必须作为创建页面的父组件包含在其中，之后，您将插入所有您想要的小部件，但如果您要创建一个新页面，则必须添加MaterialApp之后的Scaffold是第二个组件。

bmp9r5qi6#

当我尝试在CupertinoDialogAlert中显示TextFormField作为我的content小部件时，我遇到了这个错误。我的修复方法是将内容 Package 在Card中，标高为0，颜色为透明。content是作为小部件传递的参数。因此，它实际上可以是任何类型的小部件。我注意到，如果我传递一个文本小部件，它会失去居中，所以我也是通过编程来完成的。

return CupertinoAlertDialog(
          title: title,
          content: Card(
              elevation: 0,
              color: Colors.transparent,
              child: (content is Text)
                  ? content
                  : Text(content.toString(), textAlign: TextAlign.center)),
          actions: actions);

flutter 找不到材质小部件文本域小部件需要材质小部件祖先

6条答案

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