demo中NestedScrollView 必现error

[BurnieLiu]

demo中NestedScrollView 必现error

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════════ Exception caught by rendering library ═════════════════════════════════
The following assertion was thrown during performLayout():
RenderBox.size accessed beyond the scope of resize, layout, or permitted parent access. RenderBox can always access its own size, otherwise, the only object that is allowed to read RenderBox.size is its parent, if they have said they will. It you hit this assert trying to access a child's size, pass "parentUsesSize: true" to that child's layout().
'package:flutter/src/rendering/box.dart':
Failed assertion: line 2009 pos 13: 'debugDoingThisResize || debugDoingThisLayout || _computingThisDryLayout ||
(RenderObject.debugActiveLayout == parent && size._canBeUsedByParent)'

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

The relevant error-causing widget was
CustomScrollView
When the exception was thrown, this was the stack
#2 RenderBox.size.
#3 RenderBox.size
#4 Element.size
#5 IndicatorNotifier.position=
#6 IndicatorNotifier._updateBySimulation
#7 _ERScrollPhysics.createBallisticSimulation
#8 ScrollPhysics.createBallisticSimulation
#9 _NestedScrollPosition.goBallistic
#10 BallisticScrollActivity.applyNewDimensions
#11 ScrollPosition.applyNewDimensions
#12 _NestedScrollPosition.applyNewDimensions
#13 _ExtendedNestedScrollPosition.applyNewDimensions
#14 ScrollPosition.applyContentDimensions
#15 _ExtendedNestedScrollPosition.applyContentDimensions
#16 RenderViewport.performLayout
#17 RenderObject._layoutWithoutResize
#18 PipelineOwner.flushLayout
#19 RendererBinding.drawFrame
#20 WidgetsBinding.drawFrame
#21 RendererBinding._handlePersistentFrameCallback
#22 SchedulerBinding._invokeFrameCallback
#23 SchedulerBinding.handleDrawFrame
#24 SchedulerBinding._handleDrawFrame
#25 _invoke (dart:ui/hooks.dart:148:13)
#26 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:318:5)
#27 _drawFrame (dart:ui/hooks.dart:115:31)
(elided 2 frames from class _AssertionError)
The following RenderObject was being processed when the exception was fired: RenderViewport#8dca2 NEEDS-LAYOUT NEEDS-PAINT
RenderObject: RenderViewport#8dca2 NEEDS-LAYOUT NEEDS-PAINT
needs compositing
parentData: (can use size)
constraints: BoxConstraints(0.0<=w<=430.0, 0.0<=h<=705.0)
layer: OffsetLayer#32cf2
engine layer: OffsetEngineLayer#ad6b4
handles: 2
offset: Offset(0.0, 227.0)
size: Size(430.0, 705.0)
axisDirection: down
crossAxisDirection: right
offset: _ExtendedNestedScrollPosition#ec8f3(inner, offset: -126.0, range: 0.0..1695.0, viewport: 705.0)
anchor: 0.0
center child: RenderSliverList#45f26 relayoutBoundary=up1 NEEDS-PAINT
needs compositing
parentData: paintOffset=Offset(0.0, 126.0) (can use size)
constraints: SliverConstraints(AxisDirection.down, GrowthDirection.forward, ScrollDirection.idle, scrollOffset: 0.0, remainingPaintExtent: 579.0, overlap: -126.0, crossAxisExtent: 430.0, crossAxisDirection: AxisDirection.right, viewportMainAxisExtent: 705.0, remainingCacheExtent: 829.0, cacheOrigin: 0.0)
geometry: SliverGeometry(scrollExtent: 2400.0, paintExtent: 579.0, maxPaintExtent: 2400.0, hasVisualOverflow: true, cacheExtent: 829.0)
scrollExtent: 2400.0
paintExtent: 579.0
maxPaintExtent: 2400.0
hasVisualOverflow: true
cacheExtent: 829.0
currently live children: 0 to 6
child with index 0: RenderIndexedSemantics#c4012 relayoutBoundary=up2
needs compositing
parentData: index=0; layoutOffset=0.0 (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#324
Rect.fromLTRB(0.0, 129.0, 430.0, 249.0)
tags: RenderViewport.twoPane
size: Size(430.0, 120.0)
index: 0
child: RenderRepaintBoundary#b7d89 relayoutBoundary=up3
needs compositing
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
layer: OffsetLayer#9f467
engine layer: OffsetEngineLayer#10f60
handles: 2
offset: Offset(0.0, 129.0)
size: Size(430.0, 120.0)
metrics: 98.1% useful (1 bad vs 53 good)
diagnosis: this is an outstandingly useful repaint boundary and should definitely be kept
child: RenderSemanticsAnnotations#20a77 relayoutBoundary=up4
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#325
Rect.fromLTRB(0.0, 0.0, 430.0, 120.0)
semantic boundary
size: Size(430.0, 120.0)
child with index 1: RenderIndexedSemantics#19235 relayoutBoundary=up2
needs compositing
parentData: index=1; layoutOffset=120.0 (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#322
Rect.fromLTRB(0.0, 249.0, 430.0, 369.0)
tags: RenderViewport.twoPane
size: Size(430.0, 120.0)
index: 1
child: RenderRepaintBoundary#0566c relayoutBoundary=up3
needs compositing
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
layer: OffsetLayer#02058
engine layer: OffsetEngineLayer#b8493
handles: 2
offset: Offset(0.0, 249.0)
size: Size(430.0, 120.0)
metrics: 98.2% useful (1 bad vs 54 good)
diagnosis: this is an outstandingly useful repaint boundary and should definitely be kept
child: RenderSemanticsAnnotations#dc292 relayoutBoundary=up4
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#323
Rect.fromLTRB(0.0, 0.0, 430.0, 120.0)
semantic boundary
size: Size(430.0, 120.0)
child with index 2: RenderIndexedSemantics#b63f3 relayoutBoundary=up2
needs compositing
parentData: index=2; layoutOffset=240.0 (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#320
Rect.fromLTRB(0.0, 369.0, 430.0, 489.0)
tags: RenderViewport.twoPane
size: Size(430.0, 120.0)
index: 2
child: RenderRepaintBoundary#baf8b relayoutBoundary=up3
needs compositing
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
layer: OffsetLayer#985e3
engine layer: OffsetEngineLayer#05478
handles: 2
offset: Offset(0.0, 369.0)
size: Size(430.0, 120.0)
metrics: 98.2% useful (1 bad vs 55 good)
diagnosis: this is an outstandingly useful repaint boundary and should definitely be kept
child: RenderSemanticsAnnotations#3d6f8 relayoutBoundary=up4
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#321
Rect.fromLTRB(0.0, 0.0, 430.0, 120.0)
semantic boundary
size: Size(430.0, 120.0)
child with index 3: RenderIndexedSemantics#d7ac9 relayoutBoundary=up2
needs compositing
parentData: index=3; layoutOffset=360.0 (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#318
Rect.fromLTRB(0.0, 489.0, 430.0, 609.0)
tags: RenderViewport.twoPane
size: Size(430.0, 120.0)
index: 3
child: RenderRepaintBoundary#82035 relayoutBoundary=up3
needs compositing
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
layer: OffsetLayer#afbd3
engine layer: OffsetEngineLayer#192b9
handles: 2
offset: Offset(0.0, 489.0)
size: Size(430.0, 120.0)
metrics: 98.2% useful (1 bad vs 56 good)
diagnosis: this is an outstandingly useful repaint boundary and should definitely be kept
child: RenderSemanticsAnnotations#47e1c relayoutBoundary=up4
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#319
Rect.fromLTRB(0.0, 0.0, 430.0, 120.0)
semantic boundary
size: Size(430.0, 120.0)
child with index 4: RenderIndexedSemantics#322af relayoutBoundary=up2
needs compositing
parentData: index=4; layoutOffset=480.0 (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#316
Rect.fromLTRB(0.0, 609.0, 430.0, 705.0)
tags: RenderViewport.twoPane
size: Size(430.0, 120.0)
index: 4
child: RenderRepaintBoundary#6a835 relayoutBoundary=up3
needs compositing
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
layer: OffsetLayer#7337b
engine layer: OffsetEngineLayer#16538
handles: 2
offset: Offset(0.0, 609.0)
size: Size(430.0, 120.0)
metrics: 98.1% useful (1 bad vs 53 good)
diagnosis: this is an outstandingly useful repaint boundary and should definitely be kept
child: RenderSemanticsAnnotations#1c282 relayoutBoundary=up4
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#317
Rect.fromLTRB(0.0, 0.0, 430.0, 96.0)
semantic boundary
size: Size(430.0, 120.0)
child with index 5: RenderIndexedSemantics#a9eba relayoutBoundary=up2
needs compositing
parentData: index=5; layoutOffset=600.0 (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#312
Rect.fromLTRB(0.0, 729.0, 430.0, 849.0)
tags: RenderViewport.twoPane
flags: isHidden
HIDDEN
size: Size(430.0, 120.0)
index: 5
child: RenderRepaintBoundary#b32ad relayoutBoundary=up3
needs compositing
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
layer: OffsetLayer#21914 DETACHED
engine layer: OffsetEngineLayer#8edc7
handles: 1
offset: Offset(0.0, 680.7)
size: Size(430.0, 120.0)
metrics: 87.5% useful (1 bad vs 7 good)
diagnosis: this is a useful repaint boundary and should be kept
child: RenderSemanticsAnnotations#d4ecb relayoutBoundary=up4
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#313
Rect.fromLTRB(0.0, 0.0, 430.0, 120.0)
flags: isHidden
HIDDEN
semantic boundary
size: Size(430.0, 120.0)
child with index 6: RenderIndexedSemantics#f2f01 relayoutBoundary=up2 NEEDS-PAINT
needs compositing
parentData: index=6; layoutOffset=720.0 (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#326
Rect.fromLTRB(0.0, 849.0, 430.0, 955.0)
tags: RenderViewport.twoPane
flags: isHidden
HIDDEN
size: Size(430.0, 120.0)
index: 6
child: RenderRepaintBoundary#2b445 relayoutBoundary=up3 NEEDS-PAINT
needs compositing
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
size: Size(430.0, 120.0)
usefulness ratio: no metrics collected yet (never painted)
child: RenderSemanticsAnnotations#22b39 relayoutBoundary=up4 NEEDS-PAINT
parentData: (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
semantics node: SemanticsNode#327
Rect.fromLTRB(0.0, 0.0, 430.0, 106.0)
flags: isHidden
HIDDEN
semantic boundary
size: Size(430.0, 120.0)
child 1: _FooterLocatorRenderSliver#3b1e5 relayoutBoundary=up1
needs compositing
parentData: paintOffset=Offset(0.0, 705.0) (can use size)
constraints: SliverConstraints(AxisDirection.down, GrowthDirection.forward, ScrollDirection.idle, scrollOffset: 0.0, remainingPaintExtent: 0.0, crossAxisExtent: 430.0, crossAxisDirection: AxisDirection.right, viewportMainAxisExtent: 705.0, remainingCacheExtent: 0.0, cacheOrigin: 0.0)
geometry: SliverGeometry(scrollExtent: 0.0, paintExtent: 0.0, maxPaintExtent: 0.0)
scrollExtent: 0.0
paintExtent: 0.0
maxPaintExtent: 0.0
child: RenderConstrainedBox#1b7de relayoutBoundary=up2
needs compositing
parentData: paintOffset=Offset(0.0, -0.0) (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
size: Size(430.0, 0.0)
additionalConstraints: BoxConstraints(w=Infinity, h=0.0)
child: RenderStack#fd517
needs compositing
parentData: (can use size)
constraints: BoxConstraints(w=430.0, h=0.0)
size: Size(430.0, 0.0)
alignment: AlignmentDirectional.topStart
textDirection: ltr
fit: loose
child 1: RenderConstrainedBox#24e75 relayoutBoundary=up1
needs compositing
parentData: top=0.0; right=0.0; left=0.0; offset=Offset(0.0, 0.0) (can use size)
constraints: BoxConstraints(w=430.0, 0.0<=h<=Infinity)
size: Size(430.0, 70.0)
additionalConstraints: BoxConstraints(0.0<=w<=Infinity, h=70.0)
════════════════════════════════════════════════════════════════════════════════
flutter: [<'Tab0'>] is visible
flutter: [<'Tab0'>] is visible
...

[weichongchong]

我遇到了同样的问题