目标：我需要让此列可滚动（垂直）。
预期：此列可滚动。
实际：我的控制台出现错误，我的应用程序是空白屏幕。
值得一提的是，我确实在 Stack Overflow 上阅读了其他 BoxConstraints 问题。
不幸的是，它没有用。
最终，我有一个包含不同身高孩子的专栏。子项的组合高度大于视口高度。
我使用 SingleChildScrollview 并按照以下说明进行操作：
https://api.flutter.dev/flutter/widgets/SingleChildScrollView-class.html
LayoutBuilder、ConstrainedBox、BoxConstraints 和 IntrinsicHeight 都被使用了，但我仍然得到那个错误。
我的手机目前是白屏（右上角有“Debug”）。
所以这是我的理解：
SingleChildScrollView 通过授予无限高度使内容可滚动。
Column 自然占据了其父级的全部高度。
2 组合意味着一个 Column 将一直延伸到永远，或者直到应用程序崩溃。
LayoutBuilder 用于获取视口的大小。
ConstrainedBox 用于设置 Column 的 MINIMUM 高度。这对我说，Column 不能小于给定的高度，但可以大到无穷大。
“魔术”发生在 IntrinsicHeight 上，它强制列与其内容一样大。这就是阻止列走向无穷大的原因。
尽管如此，我仍然遇到错误。
我希望有人能帮帮忙; 以下是我的代码：
padding: EdgeInsets.all(15),
color: Colors.white,
child: LayoutBuilder(
builder:
(BuildContext context, BoxConstraints viewportConstraints) {
return SingleChildScrollView(
child: ConstrainedBox(
constraints: BoxConstraints(
minHeight: viewportConstraints.maxHeight,
),
child: IntrinsicHeight(
child: Column(
children: <Widget>[
Column(
children: [
Text(),
RaisedButton(),
Text(),
],
),
Column(
children: [
Text(),
RaisedButton(),
Text(),
],
),
Column(
children: [
Text(),
RaisedButton(),
Text(),
],
),
抛出的错误是这样的：
══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during performLayout():
BoxConstraints forces an infinite height.
These invalid constraints were provided to RenderIntrinsicHeight's layout() function by the
following function, which probably computed the invalid constraints in question:
RenderConstrainedBox.performLayout (package:flutter/src/rendering/proxy_box.dart:270:13)
The offending constraints were:
BoxConstraints(0.0<=w<=330.0, h=Infinity)
The relevant error-causing widget was:
ConstrainedBox
有这样一条有趣的线：
The following RenderObject was being processed when the exception was fired: RenderConstrainedBox#d1ae8 relayoutBoundary=up15 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
creator: ConstrainedBox ← _SingleChildViewport ← IgnorePointer-[GlobalKey#f983f] ← Semantics ←
_PointerListener ← Listener ← _GestureSemantics ←
RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#d70da] ← _PointerListener ← Listener
← _ScrollableScope ← _ScrollSemantics-[GlobalKey#d055d] ← ⋯
parentData: <none> (can use size)
constraints: BoxConstraints(0.0<=w<=330.0, 0.0<=h<=Infinity)
**size: MISSING**
additionalConstraints: BoxConstraints(0.0<=w<=Infinity, h=Infinity)
提前感谢所有提供帮助的人！