颤振：行内的列中的分隔符（）不出现答案

【问题标题】：FLUTTER: Divider() in Column inside a Row does not appear颤振：行内的列中的分隔符（）不出现
【发布时间】：2022-07-21 23:46:49
【问题描述】：

我需要在行内的列中放置一个分隔符，但没有出现分隔符。我看到一些关于不应使用 Row 的问题，但就我而言，我需要 Row。这是最简单的代码，我需要显示分隔符

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}
class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}
class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});
  final String title;
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: [
            Column(
              children: const [
                Text('up'),
                Divider(
                  color: Colors.black,
                  thickness: 2,
                ),
                Text('bottom'),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

【问题讨论】：

标签： flutter dart flutter-layout

【解决方案1】：

用SizedBox() 扭曲你的Divider()：

 SizedBox(
                  width: MediaQuery.of(context).size.width,
                  child: Divider(
                    color: Colors.black,
                    thickness: 2,
                  ),
                ),

完整的可运行sn-p：

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp();
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({required this.title});
  final String title;
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: [
            Column(
              children: [
                Text('up'),
                SizedBox(
                  width: MediaQuery.of(context).size.width,
                  child: Divider(
                    color: Colors.black,
                    thickness: 2,
                  ),
                ),
                Text('bottom'),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

【讨论】：