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,
                  ])

如果在列、行、listView等中有太多的子元素，并且必须在应用程序的许多地方执行相同的操作，那么添加多个大小的框将变得乏味。

你可以使用下面的utils来封装添加这些大小的盒子的逻辑:

List<Widget> addHorizontalSpaceBetweenElements(double space, List<Widget> widgets) {
  return _addSpaceBetweenElements(widgets, () => SizedBox(width: space));
}

List<Widget> addVerticalSpaceBetweenElements(double space, List<Widget> widgets) {
  return _addSpaceBetweenElements(widgets, () => SizedBox(height: space));
}

List<Widget> _addSpaceBetweenElements(List<Widget> widgets, ValueGetter<SizedBox> sizedBoxGetter) {
  if (widgets.isEmpty || widgets.length == 1) {
    return widgets;
  }
  List<Widget> spacedWidgets = [widgets.first];
  for (var i = 1; i < widgets.length - 1; i++) {
    spacedWidgets.add(sizedBoxGetter());
    spacedWidgets.add(widgets[i]);
  }
  spacedWidgets.add(sizedBoxGetter());
  spacedWidgets.add(widgets.last);
  return spacedWidgets;
}

你可以这样使用它们:

Column(
  children: addVerticalSpaceBetweenElements(5, [
    Text(),
    Text(),
  Row(children: addHorizontalSpaceBetweenElements(5, [
    Text(),
    Text(),
  ])),
  ]));

你可以用不同的方法来解决这个问题。

如果使用行/列，则必须使用mainAxisAlignment: MainAxisAlignment.spaceEvenly 如果你使用Wrap Widget，你必须使用runSpacing: 5, spacing: 10日, 在任何地方都可以使用SizeBox()

你可以在小部件之间放置一个具有特定高度的sizebox，如下所示:

Column(
  children: <Widget>[
    FirstWidget(),
    SizedBox(height: 100),
    SecondWidget(),
  ],
),

为什么宁愿这样包装小部件在填充?可读性!有更少的可视化样板，更少的缩进和代码遵循典型的阅读顺序。

Column(children: <Widget>[
   Container(margin: EdgeInsets.only(top:12, child: yourWidget)),
   Container(margin: EdgeInsets.only(top:12, child: yourWidget))
]);

有很多方法可以做到这一点，我在这里列出了一些。

Use SizedBox and provide some height: Column( children: <Widget>[ Widget1(), SizedBox(height: 10), // <-- Set height Widget2(), ], ) Use Spacer Column( children: <Widget>[ Widget1(), Spacer(), // <-- Spacer Widget2(), ], ) Use Expanded Column( children: <Widget>[ Widget1(), Expanded(child: SizedBox.shrink()), // <-- Expanded Widget2(), ], ) Set mainAxisAlignment Column( mainAxisAlignment: MainAxisAlignment.spaceAround, // <-- alignments children: <Widget>[ Widget1(), Widget2(), ], ) Use Wrap Wrap( direction: Axis.vertical, spacing: 20, // <-- Spacing between children children: <Widget>[ Widget1(), Widget2(), ], )