将输入字段小部件提取到一个自定义小部件中，该小部件包装在填充或带有填充的容器中(假设间隔对称)。

在每个子列之间设置大小不同的盒子(如其他回答中建议的那样)是不实际或不可维护的。如果你想改变间距，你必须改变每个大小的盒子小部件。

// An input field widget as an example column child
class MyCustomInputWidget extends StatelessWidget {
  const MyCustomInputWidget({Key? key})
      : super(key: key);

  @override
  Widget build(BuildContext context) {
    // wrapping text field in container
    return Container(
      // here is the padding :)
      padding: EdgeInsets.symmetric(vertical: 10),
      child: TextField(...)
    );
  }
}

.．.然后父类中的列

column(
  children: <Widget>[
    MyCustomInputWidget(),
    SizedBox(height: 10),
    MyCustomInputWidget(),
  ],
),

显然，您希望自定义小部件具有某种构造函数来处理不同的字段参数。

默认情况下没有高度， 您可以将列包装到容器中，并将特定高度添加到容器中。 然后你可以像下面这样使用:

Container(
   width: double.infinity,//Your desire Width
   height: height,//Your desire Height
   child: Column(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: <Widget>[
         Text('One'),
         Text('Two')
      ],
   ),
),

这是另一个涉及for循环的选项。

Column(
  children: <Widget>[
    for (var i = 0; i < widgets.length; i++)
      Column(
        children: [
          widgets[i], // The widget you want to create or place goes here.
          SizedBox(height: 10) // Any kind of padding or other widgets you want to put.
        ])
  ],
),

列小部件没有自己的高度，它只是随着我们在子小部件中添加的内容而展开。 如果你需要在多个小部件之间保持相同的空间，

Container(
   width: double.infinity,
   height: height,
   child: Column(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: <Widget>[
         Text('One'),
         Text('Two'),
         Text('Three'),
         Text('Four')
      ],
   ),
),

或者使用SizeBox、Spacer或widget在它们之间添加自定义空间， 像这样

Column(
   children: <Widget>[
         Text('One'),
         SizedBox(height: 20), 
         Text('Two'),
         SizedBox(height: 40), 
         Text('Three'),
         SizedBox(height: 30), 
         Text('Four')
   ],
 ),

你可以试试这个:

import 'package:flutter/material.dart';

class CustomColumn extends Column {
  CustomColumn({
    Key? key,
    MainAxisAlignment mainAxisAlignment = MainAxisAlignment.start,
    MainAxisSize mainAxisSize = MainAxisSize.max,
    CrossAxisAlignment crossAxisAlignment = CrossAxisAlignment.center,
    TextDirection? textDirection,
    VerticalDirection verticalDirection = VerticalDirection.down,
    TextBaseline? textBaseline,
    List children = const [],
    EdgeInsetsGeometry? rowPadding,
  }) : super(
          children: children.map((e) => Padding(padding : rowPadding ?? EdgeInsets.only(bottom:12), child : e)).toList(),
          key: key,
          mainAxisAlignment: mainAxisAlignment,
          mainAxisSize: mainAxisSize,
          crossAxisAlignment: crossAxisAlignment,
          textDirection: textDirection,
          verticalDirection: verticalDirection,
          textBaseline: textBaseline,
        );
}

并调用

CustomColumn(children: [
                    item1,
                    item2,
                    item3,
                  ])

受https://stackoverflow.com/a/70993832/14298786的启发，在List<Widget>上使用扩展来添加sizebox:

extension on List<Widget> {
  List<Widget> insertBetweenAll(Widget widget) {
    var result = List<Widget>.empty(growable: true);
    for (int i = 0; i < length; i++) {
      result.add(this[i]);
      if (i != length - 1) {
        result.add(widget);
      }
    }
    return result;
  }
}

像这样使用:

Column(children: [
  Widget1(),
  Widget2(),
  Widget3(),
].insertBetweenAll(SizedBox(height: 20)))