当键盘出现时，Flutter在AlertDialog上出现了RenderFlex溢出错误。

Question

我有一个 AlertDialog 小部件，它的行为如下所示：

以下是我的代码：

 showDialog(
    context: context,
    builder: (context) {
      return StatefulBuilder(
        builder: (context, setState) {
          return AlertDialog(
            title: Text(
              "Information sur le client $code",
            ),
            content: Container(
              height: mobileHeight * 0.75,
              width: mobileWidth * 0.9,
            child: Column(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: <Widget>[
                  Row(
                    mainAxisAlignment: MainAxisAlignment.start,
                    children: [
                      Container(
                        child: IconButton(
                          icon: Icon(
                            Icons.edit,
                            color: Colors.blue,
                            size: mobileWidth * 0.05,
                          ),
                          onPressed: () {
                            setState(() => modifyNom = !modifyNom);
                            _textNameController.text = snapshot.data.nom;
                          },
                        ),
                      ),
                      modifyNom
                          ? Flexible(
                              child: TextField(
                                textAlign: TextAlign.center,
                                style: TextStyle(
                                  fontSize: mobileWidth * 0.05,
                                ),
                                controller: _textNameController,
                                decoration: InputDecoration(),
                              ),
                            )
                          : Flexible(
                              child: Text(
                                '${snapshot.data.nom}',
                                style: TextStyle(
                                  fontSize: mobileWidth * 0.05,
                                ),
                              ),
                            ),
                    ],
                  ),
                  Row(
                    children: [
                      Container(
                        child: IconButton(
                          onPressed: () {
                            setState(() => modifyContact = !modifyContact);
                            _textContactController.text = snapshot.data.contact;
                          },
                        ),
                      ),
                      Text(
                        'Contact : ',
                      ),
                      modifyContact
                          ? Flexible(
                              child: TextField(
                                textAlign: TextAlign.center,
                                controller: _textContactController,
                                decoration: InputDecoration(),
                              ),
                            )
                          : Flexible(
                              child: Text(
                                '${snapshot.data.contact}',
                              ),
                            ),
                    ],
                  ),
                ],
              ),
            ),
            actions: [
              FlatButton(
                child: Text("Annuler"),
                onPressed: () {
                  Navigator.of(context).pop(); // dismiss dialog
                },
              ),
            ],
          );
        },
      );

问题在于当我编辑TextField并且键盘弹出时，会出现以下错误：

══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during layout:
A RenderFlex overflowed by 211 pixels on the bottom.

The relevant error-causing widget was:
  Column file:///C:/Users/asmou/AndroidStudioProjects/flutter_app/lib/Alerts/showAlertInfo.dart:49:28

The overflowing RenderFlex has an orientation of Axis.vertical.
The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
black striped pattern. This is usually caused by the contents being too big for the RenderFlex.
Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the
RenderFlex to fit within the available space instead of being sized to their natural size.
This is considered an error condition because it indicates that there is content that cannot be
seen. If the content is legitimately bigger than the available space, consider clipping it with a
ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex,
like a ListView.
The specific RenderFlex in question is: RenderFlex#a3d43 OVERFLOWING:
  needs compositing
  creator: Column ← FutureBuilder<Client> ← ConstrainedBox ← Container ← DefaultTextStyle ← Padding ←
    Flexible ← Column ← IntrinsicWidth ← DefaultTextStyle ← AnimatedDefaultTextStyle ←
    _InkFeatures-[GlobalKey#50b4d ink renderer] ← ⋯
  parentData: <none> (can use size)
  constraints: BoxConstraints(w=283.4, h=173.1)
  size: Size(283.4, 173.1)
  direction: vertical
  mainAxisAlignment: spaceBetween
  mainAxisSize: max
  crossAxisAlignment: center
  verticalDirection: down
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- Asmoun

Answer 1

使用ListView或SingleChildScrollView包装Container Widget。

     showDialog(
    context: context,
    builder: (context) {
      return StatefulBuilder(
        builder: (context, setState) {
          return AlertDialog(
            title: Text(
              "Information sur le client $code",
            ),
            content: SingleChildScrollView(
              child: Container(
              height: mobileHeight * 0.75,
              width: mobileWidth * 0.9,
            child: Column(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: <Widget>[
                  Row(
                    mainAxisAlignment: MainAxisAlignment.start,
                    children: [
                      Container(
                        child: IconButton(
                          icon: Icon(
                            Icons.edit,
                            color: Colors.blue,
                            size: mobileWidth * 0.05,
                          ),
                          onPressed: () {
                            setState(() => modifyNom = !modifyNom);
                            _textNameController.text = snapshot.data.nom;
                          },
                        ),
                      ),
                      modifyNom
                          ? Flexible(
                              child: TextField(
                                textAlign: TextAlign.center,
                                style: TextStyle(
                                  fontSize: mobileWidth * 0.05,
                                ),
                                controller: _textNameController,
                                decoration: InputDecoration(),
                              ),
                            )
                          : Flexible(
                              child: Text(
                                '${snapshot.data.nom}',
                                style: TextStyle(
                                  fontSize: mobileWidth * 0.05,
                                ),
                              ),
                            ),
                    ],
                  ),
                  Row(
                    children: [
                      Container(
                        child: IconButton(
                          onPressed: () {
                            setState(() => modifyContact = !modifyContact);
                            _textContactController.text = snapshot.data.contact;
                          },
                        ),
                      ),
                      Text(
                        'Contact : ',
                      ),
                      modifyContact
                          ? Flexible(
                              child: TextField(
                                textAlign: TextAlign.center,
                                controller: _textContactController,
                                decoration: InputDecoration(),
                              ),
                            )
                          : Flexible(
                              child: Text(
                                '${snapshot.data.contact}',
                              ),
                            ),
                    ],
                  ),
                ],
              ),
            ),
          ),
            actions: [
              FlatButton(
                child: Text("Annuler"),
                onPressed: () {
                  Navigator.of(context).pop(); // dismiss dialog
                },
              ),
            ],
          );
        },
      );

- Mr. ZeroOne

Answer 2

我的整个脚手架主体是一个Column小部件，在使用AlertDialogs时也遇到了类似的渲染溢出错误；

基于Flutter错误信息提示...或者使用可滚动容器而不是Flex，如ListView - 我将Column替换为ListView，现在在使用AlertDialog时不再出现渲染溢出错误。 build()内部；

return Scaffold(
      body: ListView( // formerly a Column()
        // your remaining UI
      ),
    ),

- tommytucker7182