我有一个列小部件与两个TextField小部件作为孩子，我想在他们之间有一些空间。
我已经尝试过mainAxisAlignment: mainAxisAlignment。但结果不是我想要的。
当前回答
在这种情况下，大小框将不起作用，手机处于横向模式。
body: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Expanded(
child: Container(
margin: EdgeInsets.all(15.0),
decoration: BoxDecoration(
color: Color(0xFF1D1E33),
borderRadius: BorderRadius.circular(10.0),
),
),
),
Expanded(
child: Container(
margin: EdgeInsets.all(15.0),
decoration: BoxDecoration(
color: Color(0xFF1D1E33),
borderRadius: BorderRadius.circular(10.0),
),
),
),
Expanded(
child: Container(
margin: EdgeInsets.all(15.0),
decoration: BoxDecoration(
color: Color(0xFF1D1E33),
borderRadius: BorderRadius.circular(10.0),
),
),
),
],
)
其他回答
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(),
])),
]));
如果你不想包装填充与每个小部件或重复大小框。
试试这个:
Column(
children: [
Widget(),
Widget(),
Widget(),
Widget(),
]
.map((e) => Padding(
child: e,
padding: const EdgeInsets.symmetric(vertical: 10),
))
.toList(),
),
这将扭曲所有的小部件与填充没有重复。
在这种情况下，大小框将不起作用，手机处于横向模式。
body: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Expanded(
child: Container(
margin: EdgeInsets.all(15.0),
decoration: BoxDecoration(
color: Color(0xFF1D1E33),
borderRadius: BorderRadius.circular(10.0),
),
),
),
Expanded(
child: Container(
margin: EdgeInsets.all(15.0),
decoration: BoxDecoration(
color: Color(0xFF1D1E33),
borderRadius: BorderRadius.circular(10.0),
),
),
),
Expanded(
child: Container(
margin: EdgeInsets.all(15.0),
decoration: BoxDecoration(
color: Color(0xFF1D1E33),
borderRadius: BorderRadius.circular(10.0),
),
),
),
],
)
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(), ], )
