flutter - Flutter：如何使我的对话框可滚动？

Question

我只是颤振的新手，现在我的对话框中有问题。问题是我的对话框由于文本而溢出。所以，现在我想让它可滚动，以便仍然可以查看文本。我已经在上面放了一个“SingleChildScrollView”，但仍然不起作用请帮忙。

我的代码：

_viewingRequest(dynamic data) async {
return showDialog(
    barrierDismissible: false,
    context: _scaffoldKey.currentContext,
    builder: (context) {
      return SingleChildScrollView(
        child: AlertDialog(
          contentPadding: EdgeInsets.only(left: 25, right: 25),
          title: Center(child: Text("Information")),
          shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.all(Radius.circular(20.0))),
          content: Container(
            height: 200,
            width: 300,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: <Widget>[
                SizedBox(
                  height: 20,
                ),
                Text(
                    'Name of requestor: ${data['Name_ofUser']}'
                ),
                Text(
                  'Description:',
                ),
                Text(
                  '${data['Help_Description']}',
                ),
                Text(
                  'Type of help needed: ${data['Help_TypeNeeded']}',
                )
              ],
            ),
          ),
          actions: <Widget>[
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Container(
                  width: MediaQuery.of(context).size.width * 0.20,
                  child: RaisedButton(
                    child: new Text(
                      'Fund',
                      style: TextStyle(color: Colors.white),
                    ),
                    color: Color(0xFF121A21),
                    shape: new RoundedRectangleBorder(
                      borderRadius: new BorderRadius.circular(30.0),
                    ),
                    onPressed: () {
                      saveIssue();
                      Navigator.of(context).pop();
                    },
                  ),
                ),
                SizedBox(
                  width: MediaQuery.of(context).size.width * 0.01,
                ),
                Padding(
                  padding: const EdgeInsets.only(right: 70.0),
                  child: Container(
                    width: MediaQuery.of(context).size.width * 0.20,
                    child: RaisedButton(
                      child: new Text(
                        'Cancel',
                        style: TextStyle(color: Colors.white),
                      ),
                      color: Color(0xFF121A21),
                      shape: new RoundedRectangleBorder(
                        borderRadius: new BorderRadius.circular(30.0),
                      ),
                      onPressed: () {
                        Navigator.of(context).pop();
                      },
                    ),
                  ),
                ),
                SizedBox(
                  height: MediaQuery.of(context).size.height * 0.02,
                ),
              ],
            )
          ],
        ),
      );
    });
 }

我的用户界面：

我的用户界面链接

标签： flutterdart

Answer 1

将 SingleChildScrollView 的位置更改为 Column 的顶部可以正常工作

return AlertDialog(
            contentPadding: EdgeInsets.only(left: 25, right: 25),
            title: Center(child: Text("Information")),
            shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.all(Radius.circular(20.0))),
            content: Container(
              height: 200,
              width: 300,
              child: SingleChildScrollView(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: <Widget>[
                    SizedBox(
                      height: 20,
                    ),
                    Text(
                        'Name of requestor: }'
                    ),
                    Text(
                      'Description:' * 20,
                    ),
                    Text(
                      'Help_Description',
                    ),
                    Text(
                      'Type of help needed:Help_TypeNeeded',
                    )
                  ],
                ),
              ),
            ),

完整的测试代码

import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';

void main() {
  runApp(MyStatelessApp());
}

class MyStatelessApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Dialog Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: StatelessWidgetDemo(),
    );
  }
}

class StatelessWidgetDemo extends StatefulWidget {
  @override
  _StatelessWidgetDemoState createState() => _StatelessWidgetDemoState();
}

class _StatelessWidgetDemoState extends State<StatelessWidgetDemo> {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
        child: Scaffold(
            appBar: AppBar(
              title: Text('Dialog Demo'),
            ),
            body: Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  RaisedButton(
                    onPressed: () {
                      _showTestDialog();
                    },
                    child: Text('Show Test Dialog'),
                  ),
                  SizedBox(
                    height: 20,
                  ),
                  RaisedButton(
                    onPressed: () {
                      _showCupertinoDialog();
                    },
                    child: Text('Show Cupertino Dialog'),
                  ),
                  SizedBox(
                    height: 20,
                  ),
                  RaisedButton(
                    onPressed: () {
                      _showSimpleDialog();
                    },
                    child: Text('Show Simple Dialog'),
                  )
                ],
              ),
            )));
  }

  void _showTestDialog() {
    showDialog(
        context: context,
        barrierDismissible: false,
        //context: _scaffoldKey.currentContext,
        builder: (context) {
          return AlertDialog(
            contentPadding: EdgeInsets.only(left: 25, right: 25),
            title: Center(child: Text("Information")),
            shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.all(Radius.circular(20.0))),
            content: Container(
              height: 200,
              width: 300,
              child: SingleChildScrollView(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: <Widget>[
                    SizedBox(
                      height: 20,
                    ),
                    Text(
                        'Name of requestor: }'
                    ),
                    Text(
                      'Description:' * 20,
                    ),
                    Text(
                      'Help_Description',
                    ),
                    Text(
                      'Type of help needed:Help_TypeNeeded',
                    )
                  ],
                ),
              ),
            ),
            actions: <Widget>[
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  Container(
                    width: MediaQuery.of(context).size.width * 0.20,
                    child: RaisedButton(
                      child: new Text(
                        'Fund',
                        style: TextStyle(color: Colors.white),
                      ),
                      color: Color(0xFF121A21),
                      shape: new RoundedRectangleBorder(
                        borderRadius: new BorderRadius.circular(30.0),
                      ),
                      onPressed: () {
                        //saveIssue();
                        Navigator.of(context).pop();
                      },
                    ),
                  ),
                  SizedBox(
                    width: MediaQuery.of(context).size.width * 0.01,
                  ),
                  Padding(
                    padding: const EdgeInsets.only(right: 70.0),
                    child: Container(
                      width: MediaQuery.of(context).size.width * 0.20,
                      child: RaisedButton(
                        child: new Text(
                          'Cancel',
                          style: TextStyle(color: Colors.white),
                        ),
                        color: Color(0xFF121A21),
                        shape: new RoundedRectangleBorder(
                          borderRadius: new BorderRadius.circular(30.0),
                        ),
                        onPressed: () {
                          Navigator.of(context).pop();
                        },
                      ),
                    ),
                  ),
                  SizedBox(
                    height: MediaQuery.of(context).size.height * 0.02,
                  ),
                ],
              )
            ],
          );
        });
  }

  void _showMaterialDialog() {
    showDialog(
        context: context,
        builder: (context) {
          return AlertDialog(
            title: Text('Material Dialog'),
            content: Text('This is the content of the material dialog'),
            actions: <Widget>[
              FlatButton(
                  onPressed: () {
                    _dismissDialog();
                  },
                  child: Text('Close')),
              FlatButton(
                onPressed: () {
                  print('HelloWorld!');
                  _dismissDialog();
                },
                child: Text('HelloWorld!'),
              )
            ],
          );
        });
  }

  _dismissDialog() {
    Navigator.pop(context);
  }

  void _showCupertinoDialog() {
    showDialog(
        context: context,
        builder: (context) {
          return CupertinoAlertDialog(
            title: Text('Cupertino Dialog'),
            content: Text('This is the content of the cupertino dialog'),
            actions: <Widget>[
              FlatButton(
                  onPressed: () {
                    _dismissDialog();
                  },
                  child: Text('Close')),
              FlatButton(
                onPressed: () {
                  print('HelloWorld!');
                  _dismissDialog();
                },
                child: Text('HelloWorld!'),
              )
            ],
          );
        });
  }

  void _showSimpleDialog() {
    showDialog(
        context: context,
        builder: (context) {
          return SimpleDialog(
            title: Text('Chosse an Option'),
            children: <Widget>[
              SimpleDialogOption(
                onPressed: () {
                  _dismissDialog();
                },
                child: const Text('Option 1'),
              ),
              SimpleDialogOption(
                onPressed: () {
                  _dismissDialog();
                },
                child: const Text('Option 2'),
              ),
              SimpleDialogOption(
                onPressed: () {
                  _dismissDialog();
                },
                child: const Text('Option 3'),
              ),
              SimpleDialogOption(
                onPressed: () {
                  _dismissDialog();
                },
                child: const Text('Option 4'),
              ),
            ],
          );
        });
  }
}