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嵌套在CustomScrollView使用抛出异常
RT: 我在CustomScrollView中的嵌套使用，在自动滚动的过程中会抛出如下异常:
flutter: Another exception was thrown: ScrollController not attached to any scroll views.
不知道你的实际情况，说一下我的解决方案：如果是从网络请求的数据，请加上if...else...判断，在数据回来之前return一个Container @CrazyCoderShi @xuwankang
Widget _widgetPlanList() { final controller = new SwiperController(); return Swiper( controller: controller, // index: _swiperIndex, itemBuilder: _swiperBuilder, itemCount: menuList.length, itemWidth: ScreenUtil().setHeight(750), itemHeight: ScreenUtil().setHeight(1040), scrollDirection: Axis.horizontal, onTap: (index) { print('onTap点击了第$index个'); }, onIndexChanged: (int i) { setState(() { _activeIndex = i; }); print('onIndexChanged点击了第$i个'); }); } 没有注释index:_swiperIndex前，我也是报一样的错误，注释掉就好了
跳转到指定索引：controller.move(index);
同样问题在这里 Performing hot restart... Syncing files to device Redmi Note 7... Restarted application in 1,793ms. I/flutter (15332): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ I/flutter (15332): The following assertion was thrown building NotificationListener<ScrollNotification>: I/flutter (15332): ScrollController not attached to any scroll views. I/flutter (15332): 'package:flutter/src/widgets/scroll_controller.dart': Failed assertion: line 110 pos 12: I/flutter (15332): '_positions.isNotEmpty' I/flutter (15332): I/flutter (15332): Either the assertion indicates an error in the framework itself, or we should provide substantially I/flutter (15332): more information in this error message to help you determine and fix the underlying cause. I/flutter (15332): In either case, please report this assertion by filing a bug on GitHub: I/flutter (15332): https://github.com/flutter/flutter/issues/new?template=BUG.md I/flutter (15332): I/flutter (15332): When the exception was thrown, this was the stack: I/flutter (15332): #2 ScrollController.position (package:flutter/src/widgets/scroll_controller.dart:110:12) I/flutter (15332): #3 PageController.animateToPage (package:flutter/src/widgets/page_view.dart:120:41) I/flutter (15332): #4 _TransformerPageViewState.didUpdateWidget (package:transformer_page_view/transformer_page_view.dart:527:25) I/flutter (15332): #5 StatefulElement.update (package:flutter/src/widgets/framework.dart:3879:58) I/flutter (15332): #6 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:15) I/flutter (15332): #7 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3750:16) I/flutter (15332): #8 Element.rebuild (package:flutter/src/widgets/framework.dart:3565:5) I/flutter (15332): #9 StatelessElement.update (package:flutter/src/widgets/framework.dart:3796:5) I/flutter (15332): #10 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:15) I/flutter (15332): #11 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:4601:32) I/flutter (15332): #12 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4992:17) I/flutter (15332): #13 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:15) I/flutter (15332): #14 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3750:16) I/flutter (15332): #15 Element.rebuild (package:flutter/src/widgets/framework.dart:3565:5) I/flutter (15332): #16 StatefulElement.update (package:flutter/src/widgets/framework.dart:3894:5) I/flutter (15332): #17 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:15) I/flutter (15332): #18 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4883:14) I/flutter (15332): #19 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:15) I/flutter (15332): #20 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4883:14) I/flutter (15332): #21 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:15) I/flutter (15332): #22 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3750:16) I/flutter (15332): #23 Element.rebuild (package:flutter/src/widgets/framework.dart:3565:5) I/flutter (15332): #24 StatelessElement.update (package:flutter/src/widgets/framework.dart:3796:5) I/flutter (15332): #25 Element.updateChild (package:flutter/src/widgets/framework.dart:2753:15) I/flutter (15332): #26 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3750:16) I/flutter (15332): #27 Element.rebuild (package:flutter/src/widgets/framework.dart:3565:5) I/flutter (15332): #28 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2278:33) I/flutter (15332): #29 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:700:20) I/flutter (15332): #30 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:286:5) I/flutter (15332): #31 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1012:15) I/flutter (15332): #32 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:952:9) I/flutter (15332): #33 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:864:5) I/flutter (15332): #37 _invoke (dart:ui/hooks.dart:219:10) I/flutter (15332): #38 _drawFrame (dart:ui/hooks.dart:178:3) I/flutter (15332): (elided 5 frames from class _AssertionError and package dart:async) I/flutter (15332): ════════════════════════════════════════════════════════════════════════════════════════════════════ I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views. I/flutter (15332): Another exception was thrown: ScrollController not attached to any scroll views.
I found the solution!!
Your Swiper must be wrap with StreamBuilder or something that rebuild more than once Swiper.
In my case,
StreamBuilder( stream: slides, initialData: [], builder: (context, AsyncSnapshot snap) { List slideList = snap.data.toList(); return slideList.isNotEmpty ? Swiper( itemBuilder: (BuildContext context, int index) { return Image.network( slideList[index]['image'], fit: BoxFit.fill, ); },
Check the slideList not empty.
If you want to use Swiper in other ScrollView ( like ListView ), consider boxing it using Container OR other Widget that could offer the certain size.
Container(
constraints: BoxConstraints(maxHeight: 200, maxWidth: 200),
child: Swiper()
)
The reason is described at Unbounded constraints.
不知道你的实际情况，说一下我的解决方案：如果是从网络请求的数据，请加上if...else...判断，在数据回来之前return一个Container @CrazyCoderShi @xuwankang
多谢，你的回答解决了我的问题
我是嵌套到ListView里面使用 Container( height: 154.0, child: Swiper() 我使用Container固定高度解决了这个问题
If you want to use Swiper in other ScrollView ( like ListView ), consider boxing it using Container OR other Widget that could offer the certain size.
Container( constraints: BoxConstraints(maxHeight: 200, maxWidth: 200), child: Swiper() )The reason is described at Unbounded constraints.
I have this issue and i realized tha with a heighted Containter it works, but y have a Swipe whith variable heights, do you know to deal with that dinamic height?
