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flutter報錯Cannot hit test a render box that has never been laid out

2年前作者：1024小神分類：Toy博客閱讀(22)違法舉報

這篇具有很好參考價值的文章主要介紹了flutter報錯Cannot hit test a render box that has never been laid out。希望對大家有所幫助。如果存在錯誤或未考慮完全的地方，請大家不吝賜教，您也可以點擊"舉報違法"按鈕提交疑問。

出現(xiàn)這個問題的原因可能是因為你把一個ListView或者GridView放到了一個沒有設(shè)置大小的容器里面導(dǎo)致的，所以意思是不能渲染那一個沒有布局過的容器。我這里遇到的錯誤是因為我把GridView放到了一個Container里面，并且我沒有設(shè)置Container寬高。

flutter報錯Cannot hit test a render box that has never been laid out,多端開發(fā),flutter

就導(dǎo)致了那個錯誤：

flutter報錯Cannot hit test a render box that has never been laid out,多端開發(fā),flutter

======== Exception caught by gestures library ======================================================
The following assertion was thrown while handling a pointer data packet:
Cannot hit test a render box that has never been laid out.

The hitTest() method was called on this RenderBox: RenderStack#349bb NEEDS-LAYOUT NEEDS-PAINT
... ?parentData: offset=Offset(0.0, 0.0); id=_ScaffoldSlot.floatingActionButton
... ?constraints: MISSING
... ?size: MISSING
... ?alignment: Alignment.centerRight
... ?textDirection: ltr
... ?fit: loose
Unfortunately, this object's geometry is not known at this time, probably because it has never been laid out. This means it cannot be accurately hit-tested.

If you are trying to perform a hit test during the layout phase itself, make sure you only hit test nodes that have completed layout (e.g. the node's children, after their layout() method has been called).

When the exception was thrown, this was the stack:?
#0 ? ? ?RenderBox.hitTest.<anonymous closure> (package:flutter/src/rendering/box.dart:2442:11)
#1 ? ? ?RenderBox.hitTest (package:flutter/src/rendering/box.dart:2473:6)
#2 ? ? ?RenderBoxContainerDefaultsMixin.defaultHitTestChildren.<anonymous closure> (package:flutter/src/rendering/box.dart:2854:25)
#3 ? ? ?BoxHitTestResult.addWithPaintOffset (package:flutter/src/rendering/box.dart:800:31)
#4 ? ? ?RenderBoxContainerDefaultsMixin.defaultHitTestChildren (package:flutter/src/rendering/box.dart:2849:33)
#5 ? ? ?RenderCustomMultiChildLayoutBox.hitTestChildren (package:flutter/src/rendering/custom_layout.dart:415:12)
#6 ? ? ?RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#7 ? ? ?RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#8 ? ? ?RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#9 ? ? ?RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#10 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#11 ? ? RenderPhysicalModel.hitTest (package:flutter/src/rendering/proxy_box.dart:1990:18)
#12 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#13 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#14 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#15 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#16 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#17 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#18 ? ? RenderIgnorePointer.hitTest (package:flutter/src/rendering/proxy_box.dart:3609:31)
#19 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#20 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#21 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#22 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#23 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#24 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#25 ? ? RenderOffstage.hitTest (package:flutter/src/rendering/proxy_box.dart:3738:31)
#26 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#27 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#28 ? ? _RenderTheaterMixin.hitTestChildren.childHitTest (package:flutter/src/widgets/overlay.dart:856:81)
#29 ? ? BoxHitTestResult.addWithPaintOffset (package:flutter/src/rendering/box.dart:800:31)
#30 ? ? _RenderTheaterMixin.hitTestChildren (package:flutter/src/widgets/overlay.dart:857:22)
#31 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#32 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#33 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#34 ? ? RenderAbsorbPointer.hitTest (package:flutter/src/rendering/proxy_box.dart:3856:17)
#35 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#36 ? ? RenderProxyBoxWithHitTestBehavior.hitTest (package:flutter/src/rendering/proxy_box.dart:172:19)
#37 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#38 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#39 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#40 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#41 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#42 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#43 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#44 ? ? RenderTapRegionSurface.hitTest (package:flutter/src/widgets/tap_region.dart:213:28)
#45 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#46 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#47 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#48 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#49 ? ? RenderProxyBoxMixin.hitTestChildren (package:flutter/src/rendering/proxy_box.dart:117:19)
#50 ? ? RenderBox.hitTest (package:flutter/src/rendering/box.dart:2475:11)
#51 ? ? RenderView.hitTest (package:flutter/src/rendering/view.dart:194:14)
#52 ? ? RendererBinding.hitTestInView (package:flutter/src/rendering/binding.dart:534:16)
#53 ? ? GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:384:7)
#54 ? ? GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:376:5)
#55 ? ? GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:323:7)
#56 ? ? GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:292:9)
#57 ? ? _invoke1 (dart:ui/hooks.dart:186:13)
#58 ? ? PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:424:7)
#59 ? ? _dispatchPointerDataPacket (dart:ui/hooks.dart:119:31)
====================================================================================================

======== Exception caught by gestures library ======================================================
The following assertion was thrown while handling a pointer data packet:
'package:flutter/src/rendering/mouse_tracker.dart': Failed assertion: line 205 pos 12: '!_debugDuringDeviceUpdate': is not true.


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.yml

When the exception was thrown, this was the stack:?
#2 ? ? ?MouseTracker._deviceUpdatePhase (package:flutter/src/rendering/mouse_tracker.dart:205:12)
#3 ? ? ?MouseTracker.updateWithEvent.<anonymous closure> (package:flutter/src/rendering/mouse_tracker.dart:328:7)
#4 ? ? ?MouseTracker._monitorMouseConnection (package:flutter/src/rendering/mouse_tracker.dart:193:9)
#5 ? ? ?MouseTracker.updateWithEvent (package:flutter/src/rendering/mouse_tracker.dart:327:5)
#6 ? ? ?RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:326:20)
#7 ? ? ?GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:413:7)
#8 ? ? ?GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:376:5)
#9 ? ? ?GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:323:7)
#10 ? ? GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:292:9)
#11 ? ? _invoke1 (dart:ui/hooks.dart:186:13)
#12 ? ? PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:424:7)
#13 ? ? _dispatchPointerDataPacket (dart:ui/hooks.dart:119:31)
(elided 2 frames from class _AssertionError)

?所以添加一個寬高就好了：

flutter報錯Cannot hit test a render box that has never been laid out,多端開發(fā),flutter文章來源地址http://www.zghlxwxcb.cn/news/detail-806411.html

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