小编ahm*_*man的帖子

我正在尝试使用此代码在颤振应用程序中构建滚动滑块来构建约束：

var cardAspectRatio = 12.0 / 16.0;
var widgetAspectRatio = cardAspectRatio * 1.2;

AspectRatio (
aspectRatio: widgetAspectRatio,
  child: LayoutBuilder(builder: (context, constraints) {
    var width = constraints.maxWidth;
    var height = constraints.maxHeight;
})

为了给它它的宽度和高度约束，但由此产生的错误表明框约束是无界的：

I/flutter ( 6957): RenderAspectRatio has unbounded constraints.
I/flutter ( 6957): This RenderAspectRatio was given an aspect ratio of 
                   0.8999999999999999 but was given both unbounded
I/flutter ( 6957): constraints: BoxConstraints(unconstrained)
I/flutter ( 6957): size: MISSING
I/flutter ( 6957): aspectRatio: 0.9

我该如何解决这个问题？

这个断言现在跟着我因为某种原因使用不同的代码，搜索它，发现flutter团队现在还没有解决它，我们有什么可以做的吗？

v`I/flutter ( 5598): Another exception was thrown: 
'package:flutter/src/animation/animations.dart': Failed assertion: line 
376 pos 15: 'parent != null': is not true.
I/chatty  ( 5598): uid=10085(com.example.gam3ity_aa) 1.ui identical 21 
lines
I/flutter ( 5598): Another exception was thrown: 
'package:flutter/src/animation/animations.dart': Failed assertion: line 
376 pos 15: 'parent != null': is not true.
I/flutter ( 5598): Another exception was thrown: 
'package:flutter/src/animation/animations.dart': Failed assertion: line 
376 pos 15: 'parent != null': is not true.
I/chatty  ( 5598): uid=10085(com.example.gam3ity_aa) 1.ui identical 10 
lines
I/flutter ( 5598): …