我正努力只用我的应用程序中的表进行视图。
我试图创建一个带有表的容器，如下所示：
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text(report['name'])),
body: Container(
child: Table(children: [
TableRow(children: [
Text("r1"),
Text("r2"),
Text("r3")
]),
TableRow(children: [
Text("c1"),
Text("c2"),
Text("c3")
])
])
)
);
}
但是我收到一个很长的错误，不知道该怎么办。有想法吗？
I/flutter ( 5913): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter ( 5913): The following assertion was thrown during performLayout():
I/flutter ( 5913): 'package:flutter/src/rendering/table.dart': Failed assertion: line 882 pos 16: 'tableWidth >=
I/flutter ( 5913): targetWidth': is not true.
I/flutter ( 5913):
I/flutter ( 5913): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter ( 5913): more information in this error message to help you determine and fix the underlying cause.
I/flutter ( 5913): In either case, please report this assertion by filing a bug on GitHub:
I/flutter ( 5913): https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter ( 5913):
I/flutter ( 5913): When the exception was thrown, this was the stack:
I/flutter ( 5913): #2 RenderTable._computeColumnWidths (package:flutter/src/rendering/table.dart:882:16)
I/flutter ( 5913): #3 RenderTable.performLayout (package:flutter/src/rendering/table.dart:1000:33)
I/flutter ( 5913): #4 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #5 MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:142:11)
I/flutter ( 5913): #6 _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:339:7)
I/flutter ( 5913): #7 MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:212:7)
I/flutter ( 5913): #8 RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:356:14)
I/flutter ( 5913): #9 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #10 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #11 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #12 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #13 _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1188:11)
I/flutter ( 5913): #14 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #15 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #16 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #17 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #18 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #19 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #20 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #21 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #22 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #23 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #24 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #25 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #26 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #27 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #28 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #29 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #30 RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:2881:13)
I/flutter ( 5913): #31 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #32 RenderStack.performLayout (package:flutter/src/rendering/stack.dart:510:15)
I/flutter ( 5913): #33 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #34 __RenderTheatre&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #35 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #36 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #37 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #38 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #39 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #40 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #41 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #42 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #43 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #44 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter ( 5913): #45 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter ( 5913): #46 RenderView.performLayout (package:flutter/src/rendering/view.dart:147:13)
I/flutter ( 5913): #47 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1509:7)
I/flutter ( 5913): #48 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:768:18)
I/flutter ( 5913): #49 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:281:19)
I/flutter ( 5913): #50 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:677:13)
I/flutter ( 5913): #51 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:219:5)
I/flutter ( 5913): #52 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:990:15)
I/flutter ( 5913): #53 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:930:9)
I/flutter ( 5913): #54 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:751:7)
I/flutter ( 5913): #56 _Timer._runTimers (dart:isolate/runtime/libtimer_impl.dart:382:19)
I/flutter ( 5913): #57 _Timer._handleMessage (dart:isolate/runtime/libtimer_impl.dart:416:5)
I/flutter ( 5913): #58 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:171:12)
I/flutter ( 5913): (elided 3 frames from class _AssertionError and package dart:async)
I/flutter ( 5913):
I/flutter ( 5913): The following RenderObject was being processed when the exception was fired:
I/flutter ( 5913): RenderTable#20b29 relayoutBoundary=up1 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): creator: Table ← Container ← MediaQuery ← LayoutId-[<_ScaffoldSlot.body>] ← CustomMultiChildLayout
I/flutter ( 5913): ← AnimatedBuilder ← DefaultTextStyle ← AnimatedDefaultTextStyle ← _InkFeatures-[GlobalKey#5a2a3
I/flutter ( 5913): ink renderer] ← NotificationListener<LayoutChangedNotification> ← PhysicalModel ←
I/flutter ( 5913): AnimatedPhysicalModel ← ⋯
I/flutter ( 5913): parentData: offset=Offset(0.0, 0.0); id=_ScaffoldSlot.body (can use size)
I/flutter ( 5913): constraints: BoxConstraints(0.0<=w<=1024.0, 0.0<=h<=640.0)
I/flutter ( 5913): size: MISSING
I/flutter ( 5913): default column width: FlexColumnWidth(1.0)
I/flutter ( 5913): table size: 7×2
I/flutter ( 5913): column offsets: unknown
I/flutter ( 5913): row offsets: []
I/flutter ( 5913): This RenderObject had the following descendants (showing up to depth 5):
I/flutter ( 5913): RenderParagraph#f5a27 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#eb645 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#d2e6f NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#69137 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#69e3f NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#9a868 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#6acd5 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#3af4f NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#6bc48 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#16992 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#18f98 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#d593f NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#1d8f7 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): RenderParagraph#e0527 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5913): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter ( 5913): Another exception was thrown: RenderBox was not laid out: RenderTable#20b29 relayoutBoundary=up1 NEEDS-PAINT
I/flutter ( 5913): Another exception was thrown: 'package:flutter/src/rendering/table.dart': Failed assertion: line 1127 pos 12: '_rowTops.length == rows + 1': is not true.
答案 0 :(得分：0)
您需要保留在表格单元格中 像这样-
TableRow(
children: [
TableCell(
child:Column(
children:<widget>[
Text("r1"),
Text("r2"),
Text("r3")
]
)
)
]),