Flattern Listview Bildlauffähige Zeile
new ListView(
children: [
new SizedBox(
height: 100.0,
child: ListView(
scrollDirection: Axis.horizontal,
children: <Widget>[
new Text("hi"),
new Text("hi"),
new Text("hi"),
],
),
),
],
),
Benutzte ich die Große Box und scheint immer noch der Fehler.
Dies ist mein widget-Baum:
SingleChildScrollView -> Spalte -> Kinder
Performing hot reload... flutter: ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════ flutter: The following assertion was thrown during performResize(): flutter: Vertical viewport was given unbounded height. flutter: Viewports expand in the scrolling direction to fill their container.In this case, a vertical flutter: viewport was given an unlimited amount of vertical space in which to expand. This situation flutter: typically happens when a scrollable widget is nested inside another scrollable widget. flutter: If this widget is always nested in a scrollable widget there is no need to use a viewport because flutter: there will always be enough vertical space for the children. In this case, consider using a Column flutter: instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size flutter: the height of the viewport to the sum of the heights of its children. flutter: flutter: When the exception was thrown, this was the stack: flutter: #0 RenderViewport.performResize.<anonymous closure> (package:flutter/src/rendering/viewport.dart:944:15) flutter:
#1 RenderViewport.performResize (package:flutter/src/rendering/viewport.dart:997:6) flutter: #2 RenderObject.layout (package:flutter/src/rendering/object.dart:1555:9) flutter: #3
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #4 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #5
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #6 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #7
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #8 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #9
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #10 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #11
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #12 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #13 RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:738:15) flutter: #14 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #15 RenderPadding.performLayout (package:flutter/src/rendering/shifted_box.dart:199:11) flutter: #16 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #17 _RenderSingleChildViewport.performLayout (package:flutter/src/widgets/single_child_scroll_view.dart:479:13) flutter: #18 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #19
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #20 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #21
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #22 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #23
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #24 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #25
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #26 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #27
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #28 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #29 RenderPositionedBox.performLayout (package:flutter/src/rendering/shifted_box.dart:381:13) flutter: #30 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #31 MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:141:11) flutter: #32
_ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:399:7) flutter: #33 MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:211:7) flutter: #34 RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:355:14) flutter: #35 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #36
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #37 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #38
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #39
_RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1143:11) flutter: #40 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #41
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #42 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #43
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #44 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #45
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #46 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #47 RenderStack.performLayout (package:flutter/src/rendering/stack.dart:520:15) flutter: #48 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #49
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #50 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #51
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #52 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #53
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #54 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #55
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #56 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #57
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #58 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #59
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #60 RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:2809:13) flutter: #61 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #62 RenderStack.performLayout (package:flutter/src/rendering/stack.dart:520:15) flutter: #63 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #64
__RenderTheatre&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #65 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #66
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #67 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #68
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #69 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #70
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #71 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #72
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #73 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #74
_RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:109:13) flutter: #75 RenderObject.layout (package:flutter/src/rendering/object.dart:1570:7) flutter: #76 RenderView.performLayout (package:flutter/src/rendering/view.dart:125:13) flutter: #77 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1445:7) flutter: #78 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:709:18) flutter: #79
_WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:270:19) flutter: #80
_WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:627:13) flutter: #81
_WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:208:5) flutter: #82
_WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:990:15) flutter: #83
_WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:930:9) flutter: #84
_WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:751:7) flutter:
#86 _Timer._runTimers (dart:isolate/runtime/libtimer_impl.dart:382:19) flutter: #87
_Timer._handleMessage (dart:isolate/runtime/libtimer_impl.dart:416:5) flutter: #88 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:165:12) flutter: (elided one frame from package dart:async) flutter: flutter: The following RenderObject was being processed when the exception was fired: flutter: RenderViewport#c5015 NEEDS-LAYOUT NEEDS-PAINT flutter: creator: Viewport ← _ScrollableScope ← IgnorePointer-[GlobalKey#58446] ← Semantics ← Listener ← flutter: _GestureSemantics ← RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#efcf9] ← flutter: _ExcludableScrollSemantics-[GlobalKey#1ff3b] ← Scrollable ← ListView ← Column ← Padding ← ⋯ flutter: parentData: <none> (can use size) flutter: constraints: BoxConstraints(0.0<=w<=335.0,
0.0<=h<=Infinity) flutter: size: MISSING flutter: axisDirection: down flutter: crossAxisDirection: right flutter: offset: ScrollPositionWithSingleContext#05c53(offset: 0.0, range: null..null, viewport: null, flutter: ScrollableState, AlwaysScrollableScrollPhysics -> BouncingScrollPhysics, IdleScrollActivity#31dab, flutter: ScrollDirection.idle) flutter: anchor: 0.0 flutter: This RenderObject had the following descendants (showing up to depth 5): flutter: RenderSliverPadding#912f7 NEEDS-LAYOUT NEEDS-PAINT flutter: RenderSliverList#41182 NEEDS-LAYOUT NEEDS-PAINT flutter: RenderRepaintBoundary#8a6de NEEDS-LAYOUT NEEDS-PAINT flutter: RenderConstrainedBox#4bfc3 NEEDS-LAYOUT NEEDS-PAINT flutter:
_RenderExcludableScrollSemantics#0976e NEEDS-LAYOUT NEEDS-PAINT flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════ flutter: Another exception was thrown: RenderBox was not laid out: RenderViewport#c5015 NEEDS-LAYOUT NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out: RenderViewport#c5015 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out: RenderIgnorePointer#a987c relayoutBoundary=up14 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out: RenderSemanticsAnnotations#9bd09 relayoutBoundary=up13 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out: RenderPointerListener#12af7 relayoutBoundary=up12 NEEDS-PAINT Reloaded 1 of 493 libraries in 603ms. flutter: Another exception was thrown: RenderBox was not laid out: RenderSemanticsGestureHandler#27e1a relayoutBoundary=up11 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out:
_RenderExcludableScrollSemantics#85fc5 relayoutBoundary=up10 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out: RenderFlex#19bee relayoutBoundary=up9 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out: RenderPadding#e802a relayoutBoundary=up8 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out:
_RenderSingleChildViewport#5d1aa relayoutBoundary=up7 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out: RenderIgnorePointer#f73b8 relayoutBoundary=up6 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out: RenderSemanticsAnnotations#610b2 relayoutBoundary=up5 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out: RenderPointerListener#cbdf9 relayoutBoundary=up4 NEEDS-PAINT flutter: Another exception was thrown: RenderBox was not laid out: RenderSemanticsGestureHandler#37577 relayoutBoundary=up3 NEEDS-PAINT flutter: Another exception was thrown: 'package:flutter/src/rendering/shifted_box.dart': Failed assertion: line 310 pos 12: 'child.hasSize': is not true. flutter: Another exception was thrown: RenderBox was not laid out:
_RenderSingleChildViewport#5d1aa relayoutBoundary=up7 NEEDS-P
Arzt Zusammenfassung (um zu sehen, alle details, laufen, flattern, Doktor -v):
[✓] Flattern (Channel beta v0.4.4, unter Mac OS X 10.13.1 17B1003, locale en-HK)
[✓] Android-toolchain - Entwicklung für Android-Geräte (Android SDK 26.0.2)
[✓] iOS toolchain - Entwicklung für iOS-Geräte (Xcode 9.2)
[✓] Android Studio (version 3.1)
[✓] Die angeschlossenen Geräte (3 verfügbar)
- Ist dies Ihre volle Funktion? Das snippet Sie bereitgestellt, funktioniert ohne Fehler auf meinem Rechner.
- lassen Sie mich die volle bauen
- für jedes listview, shrinkWrap: true
Du musst angemeldet sein, um einen Kommentar abzugeben.
Versuchen, diesen code,
Können Sie implementieren, scrollbaren Zeile flattern mit folgenden code
und für bildlauffähige Spalte ändern Sie einfach "Zeile" durch "Spalte"
finden Sie in der Ausgabe hier
Können Sie mit dem Erweiterten widget-wrap-Ihre
listView
.Erweiterte widget sagt der Bildschirm zu ermöglichen, wie viel Platz das widget nehmen will.
Oder Sie können auch schreiben
shrinkWrap:true
in IhremListView
widget (funktioniert in vielen Fällen).Einer horizontalen
ListView
wird vertikal erweitern, zu besetzen, die Höhe des übergeordneten Elements ein. Es passiert zu sein, dass in diesem Fall die Eltern-ist eine vertikaleListView
, die unendliche Höhe. Sie müssen, begrenzen Sie die Höhe Ihrer innerenListView
.Wahrscheinlich der einfachste Weg, dies zu tun, ist durch ein
SizedBox
widget.EDIT:
Das problem ist tatsächlich verursacht durch die vertikale
ListView
, weil es das Kind einerColumn
. Der Grund ist ähnlich wie oben, einListView
wird erweitert, um die Höhe des übergeordneten Elements und eineColumn
hat unbegrenzter Höhe.Dieses snippet zeigt das symptom.
Die Lösung ist in diesem Fall abhängig von Ihrem setup. Könnten Sie wickeln Sie es um eine
SizedBox
wieder. Man könnte die Spalte Elemente, die Teil IhresListView
. Oder Sie könnte auch dieListView
für eineColumn
.SizedBox
gelöst ist das Problem bei meiner Maschine.ListView
imContainer
mit fester Höhe, wirkt er wie einSizedBox
.Wickeln Sie die 'ListView' mit 'Erweitert' widget.
Der Grund ist, Sie nicht verwenden ein Listview innerhalb einer Listview in flattern, so dass Sie haben, um eins von Ihnen, entweder die Spalte oder Zeile, je nach Bedarf .
)
Dies würde befriedigen Ihre Anforderung nach mir .
Müssen Sie wickeln Sie Ihre horizontale
ListView
innenSizedBox
widget. Haben Sie einen Blick auf diese Probe-code:Dies mag wie eine faule Antwort, aber haben Sie versucht, dabei eine
$ flutter clean
?Wenn ich dies mit der Verwendung von standard-Textbausteinen gegeben, wenn Sie öffnen einen neuen flattern Projekt läuft es Prima, mit dem gleichen code gab, dass Sie Fragen.
Ich weiß, dies ist eine ältere Frage, aber ich hoffe, jemand findet das nützlich.
Dies ist, was ich benutzt habe;
Und dies ist, was ich habe;
verwenden Sie diese
So können Sie dies auch tun:
durch das einwickeln von Ihren
ListView
imContainer
WidgetKönnen Sie versuchen, diese, sowie für horizontale und vertikale Bildläufe.