在列小部件内容中使用 SingleChildScrollview 不滚动

Question

Widget build(BuildContext context) {
    return Scaffold(
      resizeToAvoidBottomInset: false,
      backgroundColor: Colors.white,
      body: Container(
        child: Column(
          children: <Widget>[
            Stack(
              fit: StackFit.loose,
              children: <Widget>[
                HeadersVC(),
                Container(
                  margin: EdgeInsets.only(top: 40.0),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.start,
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: <Widget>[
                      FlatButton(
                        splashColor: Colors.transparent,
                        highlightColor: Colors.transparent,
                        onPressed: () {
                          Navigator.pop(context);
                        },
                        child: Icon(
                          Icons.arrow_back,
                          size: 30,
                          color: Colors.white,
                        ),
                      ),
                      Text(
                        widget.headertitleladderPre,
                        style: TextStyle(
                            fontSize: 22.0,
                            color: Colors.white,
                            fontWeight: FontWeight.bold),
                      ),
                    ],
                  ),
                )
              ],
            ),
            SingleChildScrollView(
              padding: EdgeInsets.only(top: 20.0, left: 30.0, right: 30.0),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: <Widget>[
                  Padding(
                    padding: EdgeInsets.only(top: 10.0),
                  ),
                  //******************************************** Date Picker  */
                  TextFormField(
                    onTap: () async {
                      FocusScope.of(context).requestFocus(new FocusNode());
                      _selectDate(context);
                    },
                    decoration: InputDecoration(
                        enabledBorder: UnderlineInputBorder(
                            borderSide:
                                BorderSide(color: Colors.black26, width: 1.5)),
                        contentPadding: EdgeInsets.only(left: 0.0, right: 0.0),
                        labelText: formatDate(formatedDate),
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black),
                        suffixIcon: new Padding(
                          padding: const EdgeInsets.only(
                              top: 0.0, left: 0.0, right: 0.0, bottom: 0.0),
                          child: SizedBox(
                            height: 15,
                            child: Icon(
                              Icons.calendar_today,
                              color: Colors.red,
                            ),
                          ),
                        )),
                  ),
                  Padding(
                    padding: EdgeInsets.only(left: 0.0, top: 10.0),
                  ),
                  //******************************************** DropDown Button  */
                  Container(
                    child: DropdownButton(
                      underline: Container(
                        height: 1.0,
                        decoration: const BoxDecoration(
                            border: Border(
                                bottom: BorderSide(
                                    color: Colors.black26, width: 1.5))),
                      ),
                      value: _selectedladleno,
                      items: _dropDownladleItems,
                      onChanged: changedDropDownItem,
                      isExpanded: true,
                      isDense: false,
                      icon: Icon(
                        Icons.arrow_drop_down,
                        color: Colors.red,
                      ),
                      iconSize: 30,
                      elevation: 12,
                      style: TextStyle(
                        fontSize: 15,
                      ),
                    ),
                  ),
                  //******************************************** Radio Button  */
                  ButtonBar(
                    alignment: MainAxisAlignment.start,
                    buttonPadding: EdgeInsets.only(left: 0.0),
                    children: <Widget>[
                      Radio(
                        groupValue: _character,
                        onChanged: (SingingCharacter value) {
                          setState(() {
                            _character = value;
                            print(_character);
                          });
                        },
                        value: SingingCharacter.New,
                        activeColor: Colors.red,
                      ),
                      Text(
                        "New",
                        style: TextStyle(fontSize: 13.0),
                      ),
                      Radio(
                        groupValue: _character,
                        onChanged: (SingingCharacter value) {
                          setState(() {
                            _character = value;
                            print(_character);
                          });
                        },
                        value: SingingCharacter.Repair,
                        activeColor: Colors.red,
                      ),
                      Text(
                        "Repair",
                        style: TextStyle(fontSize: 13.0),
                      ),
                      Radio(
                        groupValue: _character,
                        onChanged: (SingingCharacter value) {
                          setState(() {
                            _character = value;
                            print(_character.toString());
                          });
                        },
                        value: SingingCharacter.OnlyMachineChange,
                        activeColor: Colors.red,
                      ),
                      Text(
                        "Machine Change",
                        style: TextStyle(fontSize: 13.0),
                      ),
                    ],
                  ),
                  //******************************************** Machine Number  */
                  TextFormField(
                    decoration: InputDecoration(
                        labelText: "Machine Number *",
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black)),
                  ),
                  TextFormField(
                    decoration: InputDecoration(
                        labelText: "Well Block Party *",
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black)),
                  ),
                  TextFormField(
                    decoration: InputDecoration(
                        labelText: "Well Block Party *",
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black)),
                  ),
                  TextFormField(
                    decoration: InputDecoration(
                        labelText: "Well Block Party *",
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black)),
                  ),
                  TextFormField(
                    decoration: InputDecoration(
                        labelText: "Well Block Party *",
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black)),
                  ),
                  TextFormField(
                    decoration: InputDecoration(
                        labelText: "Well Block Party *",
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black)),
                  ),
                  TextFormField(
                    decoration: InputDecoration(
                        labelText: "Well Block Party *",
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black)),
                  ),
                  TextFormField(
                    decoration: InputDecoration(
                        labelText: "Well Block Party *",
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black)),
                  ),
                  TextFormField(
                    decoration: InputDecoration(
                        labelText: "Well Block Party *",
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black)),
                  ),
                  TextFormField(
                    decoration: InputDecoration(
                        labelText: "Well Block Party *",
                        labelStyle: TextStyle(
                            fontFamily: "Montserrat", color: Colors.black)),
                  )
                ],
              ),
            )
          ],
        ),
      ),
    );
  }

I got Error Something Like this :

Performing hot reload... ⣟flutter: ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════ flutter: The following assertion was thrown during layout: flutter: A RenderFlex overflowed by 158 pixels on the bottom. flutter: flutter: The relevant error-causing widget was: flutter: Column file:///Users/baps/Projects/Flutter%20Projects/TRLApp/trlapp/lib/ladlePreheating.dart:64:16 flutter: flutter: The overflowing RenderFlex has an orientation of Axis.vertical. flutter: The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and flutter: black striped pattern. This is usually caused by the contents being too big for the RenderFlex. flutter: Consider applying a flex factor (eg using an Expanded widget) to force the children of the flutter: RenderFlex to fit within the available space instead of being sized to their natural size. flutter: This is considered an error condition because it indicates that there is content that cannot be flutter: seen. If the content is legitimately bigger than the available space, consider clipping it with a flutter: ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex, flutter: like a ListView. flutter: The specific RenderFlex in question is: RenderFlex#4bdfd relayoutBoundary=up1 OVERFLOWING: flutter: needs compositing flutter: creator: Column ← Container ← _BodyBuilder ← MediaQuery ← LayoutId-[<_ScaffoldSlot.body>] ← flutter: CustomMultiChildLayout ← AnimatedBuilder ← DefaultTextStyle ← AnimatedDefaultTextStyle ← flutter: _InkFeatures-[GlobalKey#9c17c ink renderer] ← NotificationListener ← flutter: PhysicalModel ← ⋯ flutter: parentData: offset=Offset(0.0, 0.0); id=_ScaffoldSlot.body (can use size) flutter: constraints: BoxConstraints(0.0<=w<=414.0, 0.0<=h<=736.0) flutter: size: Size(414.0, 736.0) flutter: direction: vertical flutter: mainAxisAlignment: start flutter: mainAxisSize: max flutter: crossAxisAlignment: center flutter: verticalDirection: down flutter: ◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤ flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════

Answer 1

Missed to Expand the ScrollView as Column container would not know how much space it needs to take and due to that, it calculates the size which is more than of screen size.

So Just place Expanded in to it:

...
Expanded(
                child: SingleChildScrollView(
                  padding:...

Answer 2

SingleChildScrollView should be Wrapped around Column :

Scaffold(
  resizeToAvoidBottomInset: false,
  backgroundColor: Colors.white,
  body: Container(
    child: SingleChildScrollView( // <--- Put it here.
        child: Column( // <--- Your Column.

Answer 3

Solution: You need to use SingleChildScrollView before column .If you want to keep separated stack part ,you can use CustomScrollView . CustomScrollView

  Widget build(BuildContext context) {
return Scaffold(
    resizeToAvoidBottomInset: false,
    backgroundColor: Colors.white,
    body: SingleChildScrollView(
      padding: EdgeInsets.only(top: 20.0, left: 30.0, right: 30.0),
      child: Container(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            Stack(
              fit: StackFit.loose,
              children: <Widget>[
                Container(
                  margin: EdgeInsets.only(top: 40.0),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.start,
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: <Widget>[
                      FlatButton(
                        splashColor: Colors.transparent,
                        highlightColor: Colors.transparent,
                        onPressed: () {
                          Navigator.pop(context);
                        },
                        child: Icon(
                          Icons.arrow_back,
                          size: 30,
                          color: Colors.white,
                        ),
                      ),
                      Text(
                        "headertitleladderPre",
                        style: TextStyle(
                            fontSize: 22.0,
                            color: Colors.white,
                            fontWeight: FontWeight.bold),
                      ),
                    ],
                  ),
                )
              ],
            ),
            Padding(
              padding: EdgeInsets.only(top: 10.0),
            ),
            //******************************************** Date Picker  */
            TextFormField(
              onTap: () async {},
              decoration: InputDecoration(
                  enabledBorder: UnderlineInputBorder(
                      borderSide:
                          BorderSide(color: Colors.black26, width: 1.5)),
                  contentPadding: EdgeInsets.only(left: 0.0, right: 0.0),
                  labelText: "formatedDate",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black),
                  suffixIcon: new Padding(
                    padding: const EdgeInsets.only(
                        top: 0.0, left: 0.0, right: 0.0, bottom: 0.0),
                    child: SizedBox(
                      height: 15,
                      child: Icon(
                        Icons.calendar_today,
                        color: Colors.red,
                      ),
                    ),
                  )),
            ),
            Padding(
              padding: EdgeInsets.only(left: 0.0, top: 10.0),
            ),
            //******************************************** DropDown Button  */
            Container(
              child: DropdownButton<String>(
                value: dropdownValue,
                icon: Icon(Icons.arrow_downward),
                iconSize: 24,
                elevation: 16,
                style: TextStyle(color: Colors.deepPurple),
                underline: Container(
                  height: 2,
                  color: Colors.deepPurpleAccent,
                ),
                onChanged: (String newValue) {},
                items: <String>['One', 'Two', 'Free', 'Four']
                    .map<DropdownMenuItem<String>>((String value) {
                  return DropdownMenuItem<String>(
                    value: value,
                    child: Text(value),
                  );
                }).toList(),
              ),
            ),
            //******************************************** Radio Button  */
            ButtonBar(
              alignment: MainAxisAlignment.start,
              buttonPadding: EdgeInsets.only(left: 0.0),
              children: <Widget>[
                Text("Radio Here"),
                Text(
                  "New",
                  style: TextStyle(fontSize: 13.0),
                ),
                Text("One More Radio Here"),
                Text(
                  "Repair",
                  style: TextStyle(fontSize: 13.0),
                ),
                Text("One More Radio Here"),
                Text(
                  "Machine Change",
                  style: TextStyle(fontSize: 13.0),
                ),
              ],
            ),
            //******************************************** Machine Number  */
            TextFormField(
              decoration: InputDecoration(
                  labelText: "Machine Number *",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black)),
            ),
            TextFormField(
              decoration: InputDecoration(
                  labelText: "Well Block Party *",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black)),
            ),
            TextFormField(
              decoration: InputDecoration(
                  labelText: "Well Block Party *",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black)),
            ),
            TextFormField(
              decoration: InputDecoration(
                  labelText: "Well Block Party *",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black)),
            ),
            TextFormField(
              decoration: InputDecoration(
                  labelText: "Well Block Party *",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black)),
            ),
            TextFormField(
              decoration: InputDecoration(
                  labelText: "Well Block Party *",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black)),
            ),
            TextFormField(
              decoration: InputDecoration(
                  labelText: "Well Block Party *",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black)),
            ),
            TextFormField(
              decoration: InputDecoration(
                  labelText: "Well Block Party *",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black)),
            ),
            TextFormField(
              decoration: InputDecoration(
                  labelText: "Well Block Party *",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black)),
            ),
            TextFormField(
              decoration: InputDecoration(
                  labelText: "Well Block Party *",
                  labelStyle: TextStyle(
                      fontFamily: "Montserrat", color: Colors.black)),
            )
          ],
        ),
      ),
    ));

}

Answer 4

Avoid Using

child: ConstrainedBox( constraints: BoxConstraints()),

In side SingleChildScrollView when i remove this widget rendering error is gone.

Sample Code of my layout.

@override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: kBackgroundColorGray,
      appBar: commonAppBar,
        body: SafeArea(
          child: SingleChildScrollView(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [

             ],
            ),
          ),
        )
    );
  }