flutter - Flutter：列行[初学者]

Question

我是 Flutter 的新手，目前我尝试编写我的第一个应用程序。我只想实现一个带有文本字段的屏幕——这很有效。现在我想将前两个文本字段并排排列。我尝试使用 Row () 并且没有收到任何错误，但突然模拟器显示我只是一个空白页。

有人可以告诉我我必须改变什么吗？我不知道我做错了什么，因为我没有得到任何错误。

感谢帮助！

import 'package:flutter/material.dart';

class TestEdit extends StatefulWidget {
  @override
  _TestEditState createState() => _TestEditState();
}

class _TestEditState extends State<TestEdit> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        automaticallyImplyLeading: true,
        //`true` if you want Flutter to automatically add Back Button when needed,
        //or `false` if you want to force your own back button every where
        backgroundColor: Colors.white,
        leading: IconButton(
          icon: Icon(Icons.arrow_back, color: Colors.black),
          onPressed: () => Navigator.pop(context, false),
        ),
      ),
      body: Column(
        children: <Widget>[
          Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            //mainAxisSize: MainAxisSize.min,
            //padding: EdgeInsets.symmetric(horizontal: 10, vertical: 10),
            children: <Widget>[
              //Row(children:[

              //crossAxisAlignment: CrossAxisAlignment.start,
              //mainAxisSize: MainAxisSize.min,
              Padding(
                padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
                child: TextField(
                  obscureText: false,
                  decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    labelText: 'InputFirst',
                  ),
                ),
              ),
              Padding(
                padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
                child: TextField(
                  obscureText: false,
                  decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    labelText: 'InputSecond',
                  ),
                ),
              ),
            ],
          ),
          //],
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
        ],
      ),
    );
  }
}

标签： flutterdartflutter-layout

Answer 1

TextField小部件将尝试尽可能多地水平扩展。

所以如果你想把一个TextField放在 a 中Row，你应该用Flexible（或Expanded）小部件包装它。

尝试这个，

class TestEdit extends StatefulWidget {
  @override
  _TestEditState createState() => _TestEditState();
}

class _TestEditState extends State<TestEdit> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        automaticallyImplyLeading: true,
        //`true` if you want Flutter to automatically add Back Button when needed,
        //or `false` if you want to force your own back button every where
        backgroundColor: Colors.white,
        leading: IconButton(
          icon: Icon(Icons.arrow_back, color: Colors.black),
          onPressed: () => Navigator.pop(context, false),
        ),
      ),
      body: Column(
        children: <Widget>[
          Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            //mainAxisSize: MainAxisSize.min,
            //padding: EdgeInsets.symmetric(horizontal: 10, vertical: 10),
            children: <Widget>[
              //Row(children:[

              //crossAxisAlignment: CrossAxisAlignment.start,
              //mainAxisSize: MainAxisSize.min,
              Expanded( //TODO: Wrap with `Expanded` 
                child: Padding(
                  padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
                  child: TextField(
                    obscureText: false,
                    decoration: InputDecoration(
                      border: OutlineInputBorder(),
                      labelText: 'InputFirst',
                    ),
                  ),
                ),
              ),
              Expanded( //TODO: Wrap with Expanded
                child: Padding(
                  padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
                  child: TextField(
                    obscureText: false,
                    decoration: InputDecoration(
                      border: OutlineInputBorder(),
                      labelText: 'InputSecond',
                    ),
                  ),
                ),
              ),
            ],
          ),
          //],
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
          Padding(
            padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
            child: TextField(
              obscureText: false,
              decoration: InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Input',
              ),
            ),
          ),
        ],
      ),
    );
  }
}