当我像这样在颤振 2.0.1 中使用 CupertinoScrollbar 时：
return GestureDetector(
onHorizontalDragStart: _onHorizontalDragStart,
onHorizontalDragUpdate: _onHorizontalDragUpdate,
onHorizontalDragEnd: _onHorizontalDragEnd,
child: CupertinoScrollbar(
child: Container(
constraints: BoxConstraints(
minHeight: MediaQuery.of(context).size.height * 0.9,
),
color: Theme.of(context).scaffoldBackgroundColor,
child: Padding(
padding: const EdgeInsets.all(
16.0,
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
InkWell(
onTap: () => CommonUtils.launchUrl(item.link),
child: Padding(
padding: const EdgeInsets.only(bottom: 8.0),
child: Container(
child: Text(
item.title == "" ? "Comment" : item.title,
style: Theme.of(context).textTheme.headline5!.copyWith(
fontWeight: FontWeight.w600,
),
),
),
),
),
if (item.domain != "")
Padding(
padding: const EdgeInsets.only(bottom: 8.0),
child: InkWell(
onTap: () async {
navToChannelDetail();
},
child: Text(
item.domain,
style: Theme.of(context).textTheme.caption!.copyWith(color: Theme.of(context).primaryColor),
)),
),
InkWell(
onTap: () {},
child: RichText(
text: TextSpan(
children: <TextSpan>[
TextSpan(
text: item.author,
style: Theme.of(context).textTheme.caption,
),
TextSpan(
text: " ${String.fromCharCode(8226)} ",
style: Theme.of(context).textTheme.caption,
),
TextSpan(
text: item.ago,
style: Theme.of(context).textTheme.caption,
),
],
),
),
),
if (item.content != "")
Html(
data: item.content,
style: {
"body": Style(
fontSize: FontSize(19.0),
),
},
onLinkTap: (url) => CommonUtils.launchUrl(url),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Row(
children: [
Padding(
padding: const EdgeInsets.only(right: 16.0),
child: Row(
children: [
if (item.isFav == 1)
IconButton(
icon: Icon(Icons.bookmark, color: Theme.of(context).primaryColor),
onPressed: () => touchFav("unfav", FavStatus.UNFAV),
),
if (item.isFav != 1)
IconButton(
icon: Icon(Icons.bookmark),
onPressed: () => touchFav("fav", FavStatus.FAV),
),
Padding(
padding: const EdgeInsets.only(left: 0.0),
child: Text(
"${item.favCount}",
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.caption!.copyWith(
color: Theme.of(context).primaryColor,
),
),
),
],
),
),
Padding(
padding: const EdgeInsets.only(bottom: 0.0),
child: Row(
children: [
if (item.isUpvote == 1)
IconButton(
icon: Icon(Icons.thumb_up, color: Theme.of(context).primaryColor),
onPressed: () => touchUpvote("unupvote", UpvoteStatus.UNUPVOTE),
),
if (item.isUpvote != 1)
IconButton(
icon: Icon(Icons.thumb_up),
onPressed: () => touchUpvote("upvote", UpvoteStatus.UPVOTE),
),
Padding(
padding: const EdgeInsets.only(left: 8.0),
child: Text(
"${item.upvoteCount}",
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.caption!.copyWith(
color: Theme.of(context).primaryColor,
),
),
),
],
),
),
],
),
IconButton(
icon: Icon(
Feather.share_2,
),
onPressed: () => handleShare(id: item.id, title: item.title, postUrl: item.link),
),
],
),
],
),
),
)));
但用户界面不显示滚动条，哪里出了问题，我应该怎么做才能解决它？
错误日志显示：
======== Exception caught by scheduler library =====================================================
The following assertion was thrown during a scheduler callback:
ScrollController not attached to any scroll views.
'package:flutter/src/widgets/scroll_controller.dart':
Failed assertion: line 108 pos 12: '_positions.isNotEmpty'
Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
https://github.com/flutter/flutter/issues/new?template=2_bug.md
When the exception was thrown, this was the stack:
#2 ScrollController.position (package:flutter/src/widgets/scroll_controller.dart:108:12)
#3 RawScrollbarState._maybeTriggerScrollbar.<anonymous closure> (package:flutter/src/widgets/scrollbar.dart:862:27)
#4 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
#5 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1090:9)
#6 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:998:5)
...
====================================================================================================