Flattern: RenderBox wurde nicht angelegt

83

Ich versuche, eine ListView zu erstellen, aber wenn ich die Klasse list_form.dart importiere, wird dieser Fehler angezeigt. Vielleicht habe ich einige Fehler mit dem Layout gemacht, weil ich diesen Fehler nicht bekomme, wenn ich versuche, es in der Hauptdatei auszuführen.

Dies ist der Fehler:

    I/flutter (12956): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (12956): The following assertion was thrown during performResize():
I/flutter (12956): Vertical viewport was given unbounded height.
I/flutter (12956): Viewports expand in the scrolling direction to fill their container.In this case, a vertical
I/flutter (12956): viewport was given an unlimited amount of vertical space in which to expand. This situation
I/flutter (12956): typically happens when a scrollable widget is nested inside another scrollable widget.
I/flutter (12956): If this widget is always nested in a scrollable widget there is no need to use a viewport because
I/flutter (12956): there will always be enough vertical space for the children. In this case, consider using a Column
I/flutter (12956): instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size
I/flutter (12956): the height of the viewport to the sum of the heights of its children.
I/flutter (12956):
I/flutter (12956): When the exception was thrown, this was the stack:
I/flutter (12956): #0      RenderViewport.performResize.<anonymous closure> (package:flutter/src/rendering/viewport.dart:1133:15)
I/flutter (12956): #1      RenderViewport.performResize (package:flutter/src/rendering/viewport.dart:1186:6)
I/flutter (12956): #2      RenderObject.layout (package:flutter/src/rendering/object.dart:1616:9)
I/flutter (12956): #3      _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #4      RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #5      _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #6      RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #7      _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #8      RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #9      _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #10     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #11     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #12     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #13     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #14     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #15     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #16     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #17     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #18     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #19     RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:738:15)
I/flutter (12956): #20     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #21     RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:738:15)
I/flutter (12956): #22     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #23     RenderPositionedBox.performLayout (package:flutter/src/rendering/shifted_box.dart:381:13)
I/flutter (12956): #24     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #25     MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:141:11)
I/flutter (12956): #26     _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:339:7)
I/flutter (12956): #27     MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:211:7)
I/flutter (12956): #28     RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:355:14)
I/flutter (12956): #29     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #30     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #31     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #32     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #33     _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1192:11)
I/flutter (12956): #34     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #35     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #36     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #37     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #38     _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1192:11)
I/flutter (12956): #39     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #40     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #41     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #42     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #43     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #44     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #45     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #46     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #47     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #48     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #49     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #50     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #51     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #52     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #53     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #54     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #55     RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:2884:13)
I/flutter (12956): #56     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #57     RenderStack.performLayout (package:flutter/src/rendering/stack.dart:520:15)
I/flutter (12956): #58     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #59     __RenderTheatre&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #60     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #61     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #62     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #63     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #64     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #65     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #66     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #67     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #68     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #69     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #70     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #71     RenderView.performLayout (package:flutter/src/rendering/view.dart:147:13)
I/flutter (12956): #72     RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1506:7)
I/flutter (12956): #73     PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:765:18)
I/flutter (12956): #74     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:270:19)
I/flutter (12956): #75     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:674:13)
I/flutter (12956): #76     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:208:5)
I/flutter (12956): #77     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:990:15)
I/flutter (12956): #78     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:930:9)
I/flutter (12956): #79     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:751:7)
I/flutter (12956): #81     _Timer._runTimers (dart:isolate/runtime/libtimer_impl.dart:382:19)
I/flutter (12956): #82     _Timer._handleMessage (dart:isolate/runtime/libtimer_impl.dart:416:5)
I/flutter (12956): #83     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:171:12)
I/flutter (12956): (elided one frame from package dart:async)
I/flutter (12956):
I/flutter (12956): The following RenderObject was being processed when the exception was fired:
I/flutter (12956):   RenderViewport#925a8 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (12956):   creator: Viewport ← _ScrollableScope ← IgnorePointer-[GlobalKey#8e8f7] ← Semantics ← Listener ←
I/flutter (12956):   _GestureSemantics ← RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#67ae5] ←
I/flutter (12956):   _ScrollSemantics-[GlobalKey#17eb8] ← RepaintBoundary ← CustomPaint ← RepaintBoundary ←
I/flutter (12956):   NotificationListener<ScrollNotification> ← ⋯
I/flutter (12956):   parentData: <none> (can use size)
I/flutter (12956):   constraints: BoxConstraints(unconstrained)
I/flutter (12956):   size: MISSING
I/flutter (12956):   axisDirection: down
I/flutter (12956):   crossAxisDirection: right
I/flutter (12956):   offset: ScrollPositionWithSingleContext#c4917(offset: 0.0, range: null..null, viewport: null,
I/flutter (12956):   ScrollableState, AlwaysScrollableScrollPhysics -> ClampingScrollPhysics, IdleScrollActivity#2fecf,
I/flutter (12956):   ScrollDirection.idle)
I/flutter (12956):   anchor: 0.0
I/flutter (12956): This RenderObject had the following descendants (showing up to depth 5):
I/flutter (12956):   RenderSliverPadding#74d62 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (12956):     RenderSliverList#5c56d NEEDS-LAYOUT NEEDS-PAINT
I/flutter (12956): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderViewport#925a8 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderViewport#925a8 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderIgnorePointer#8bbda relayoutBoundary=up11 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderSemanticsAnnotations#209b4 relayoutBoundary=up10 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderPointerListener#a9641 relayoutBoundary=up9 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderSemanticsGestureHandler#9f5b4 relayoutBoundary=up8 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: _RenderScrollSemantics#47944 relayoutBoundary=up7 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderRepaintBoundary#e17a8 relayoutBoundary=up6 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderCustomPaint#a2328 relayoutBoundary=up5 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderRepaintBoundary#02607 relayoutBoundary=up4 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderFlex#79164 relayoutBoundary=up3 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: 'package:flutter/src/rendering/shifted_box.dart': Failed assertion: line 310 pos 12: 'child.hasSize': is not true.
I/flutter (12956): Another exception was thrown: NoSuchMethodError: The method '<=' was called on null.

Dies ist die list_form.dart-Klasse:

import 'package:flutter/material.dart';

class ListForm extends StatefulWidget {
  @override
  ListFormState createState() => new ListFormState();
}

class ListFormState extends State<ListForm> {
    List<String> products = ["Test1", "Test2", "Test3"];
    @override
    Widget build(BuildContext context) {
      return new Container(
        child: new Center(
          child: new Column(
            children: <Widget>[
              new Row(
                children: <Widget>[
                  new ListView.builder(
                    itemCount: products.length,
                    itemBuilder: (BuildContext ctxt, int index) {
                      return new Text(products[index]);
                    }
                  ),
                  new IconButton(
                    icon: Icon(Icons.remove_circle),
                    onPressed: () { },
                  )
                ],
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
              ),
              new TextField(
                decoration: new InputDecoration(
                  hintText: "Prodotto"
                ),
                onSubmitted: (String str) {
                  setState(() {
                    products.add(str);
                  });
                },
              ),
            ]
          )
        )
      );
    }
}

Dies ist die Klasse app_base.dart:

import 'package:flutter/material.dart';
import '../UI/list_form.dart';

class AppBase extends StatefulWidget {
  @override
  State createState() => new AppBaseState();
}

class AppBaseState extends State<AppBase> {
  bool _pressed = true;

  @override
  Widget build(BuildContext context) {
    return new Material(
      color: Colors.greenAccent,
      child: new Scaffold(
        body:
          new ListForm(),
        appBar: AppBar(
          centerTitle: true,
          title: const Text('Skeeper'),
          backgroundColor: Colors.green,
        ),
        floatingActionButton: FloatingActionButton(
          tooltip: 'Test',
          child: new Icon(Icons.add),
          backgroundColor: Colors.green,
          onPressed: () {
              setState(() {
                _pressed = !_pressed;
              });
          },
        ),
      )
    );
  }
}

Machen Sie sich keine Sorgen, wenn unbenutzter Code vorhanden ist. Er ist in Arbeit und dieser Fehler hat mich nur daran gehindert, meine Arbeit fortzusetzen.

dart  flutter  flutter-layout 
— Alessandro Bertozzi
quelle

Antworten:

147

Das Problem ist, dass Sie das ListViewInnere einer Spalte / Zeile platzieren. Der Text in der Ausnahme gibt eine gute Erklärung für den Fehler.

Um den Fehler zu vermeiden, müssen Sie ListViewinnen eine Größe angeben.

Ich schlage Ihnen diesen Code vor, der ein verwendet Expanded, um die horizontale Größe (maximal verfügbar) und das SizedBox(Könnte ein Container sein) für das zu informierenheight:

    new Row(
      children: <Widget>[
        Expanded(
          child: SizedBox(
            height: 200.0,
            child: new ListView.builder(
              scrollDirection: Axis.horizontal,
              itemCount: products.length,
              itemBuilder: (BuildContext ctxt, int index) {
                return new Text(products[index]);
              },
            ),
          ),
        ),
        new IconButton(
          icon: Icon(Icons.remove_circle),
          onPressed: () {},
        ),
      ],
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
    )

,

— Chemamoline
quelle
1
Ich habe "Column" anstelle von "Row" als root verwendet. Nach dem Ändern in "Zeile" wurde der Fehler behoben. Danke für die Hilfe.
— ABHIMANGAL MS
77

Sie können einen solchen Code hinzufügen 

ListView.builder{
   shrinkWrap: true,
}
— Muazharin Alfan
quelle
Kann mir jemand zeigen, wie man dies in einer Vorlage verwendet?
— Kavinda Jayakody
1
shrinkWrap hat bei mir nicht funktioniert, ich habe die @ chemamolins-Lösung verwendet, die zu mir passte.
— Kamlesh
Dies ist eine schlechte Lösung für lange Listen. Aus der Dokumentation : "Das Schrumpfen des Inhalts der Bildlaufansicht ist erheblich teurer als das Erweitern auf die maximal zulässige Größe, da der Inhalt während des Bildlaufs erweitert und verkleinert werden kann. Dies bedeutet, dass die Größe der Bildlaufansicht bei jeder Änderung der Bildlaufposition neu berechnet werden muss ".
— Boldnik
25

Grund für den Fehler:

Columnversucht, sich in der vertikalen Achse auszudehnen, und das auch ListView, daher müssen Sie die Höhe von einschränken ListView.

Lösungen

  1. Verwenden Sie entweder Expandedoder, Flexiblewenn Sie zulassen möchten, dass ListViewder gesamte linke Platz in belegt wird Column.

    Column(
  children: <Widget>[
    Expanded(
      child: ListView(...),
    )
  ],
)

  1. Verwenden SizedBoxSie diese Option, wenn Sie die Größe ListViewauf eine bestimmte Höhe beschränken möchten .

    Column(
  children: <Widget>[
    SizedBox(
      height: 200, // constrain height
      child: ListView(),
    )
  ],
)

  1. Verwenden Sie shrinkWrap, wenn Ihre ListViewnicht zu groß ist.

    Column(
  children: <Widget>[
    ListView(
      shrinkWrap: true, // use it
    )
  ],
)
— CopsOnRoad
quelle
Vielen Dank! Dies ist bei weitem die beste und prägnanteste Antwort! Ich frage mich allerdings, warum ich in meinem Fall mit der gleichen Zusammensetzung von ColumnWrapping a ListVieweinen Fehler erhalte, wenn ich ihn verwende Expanded, aber gut funktioniert, SizedBoxobwohl 🤔
— boldnik
@boldnik Was sind andere Widgets in Ihrem Column, Sie können es tatsächlich als Frage stellen oder einfach ein Gespräch im Chat mit mir beginnen, falls Sie glauben, dass es im Kommentarbereich behandelt werden kann.
— CopsOnRoad
shrinkWrap: true, // dies löst mein Problem
— David B.
2

ich

Ich habe diesen Code verwendet, um das Problem der Anzeige von Elementen in der horizontalen Liste zu beheben.

new Container(
      height: 20,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.end,
        children: <Widget>[
          ListView.builder(
            scrollDirection: Axis.horizontal,
            shrinkWrap: true,
            itemCount: array.length,
            itemBuilder: (context, index){
              return array[index];
            },
          ),
        ],
      ),
    );
— mohammad byervand
quelle
2

Das Platzieren Ihrer Listenansicht in einem flexiblen Widget kann ebenfalls hilfreich sein:

Flexible( fit: FlexFit.tight, child: _buildYourListWidget(..),)
— mein Schlüssel
quelle
1

Schließen Sie Ihre ListView in ein erweitertes Widget ein

 Expanded(child:MyListView())
— MobileMon
quelle
2
es funktioniert nicht, wenn das Expandedeines der Kinder von aColumn
— boldnik
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