文本字段中的单词后未添加空格（颤振）答案

【问题标题】：Space is not adding after word in textfield (Flutter)文本字段中的单词后未添加空格（颤振）
【发布时间】：2021-10-09 06:52:18
【问题描述】：

我是 Flutter 的新手，我的应用程序中有一个文本字段，当我输入空格时，它不会添加到文本字段中。我已经用 ListTile 敲击了我的文本字段和按钮...这个问题是因为 ListTile 吗？如果是，那么 ListTile 的替代方案是什么，或者如果不是这种情况，那么究竟是什么问题？我的代码如下：

class _HomeState extends State<Home> {

  class _HomeState extends State<Home> {

  TextEditingController _enterDataField = TextEditingController();
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
        appBar: AppBar(
          title: new Text("Read/Write"),
          backgroundColor: Colors.blueAccent,
          centerTitle: true,
        ),
        body: new Container(
            padding: EdgeInsets.all(13.4),
            alignment: Alignment.center,

            child: new ListTile(
              title: new TextField(
                keyboardType: TextInputType.multiline,
                controller: _enterDataField,

                decoration: new InputDecoration(
                  prefixIcon: Icon(Icons.message),
                  border: OutlineInputBorder(),
                  labelText: 'Write Something',
                ),
              ),

                subtitle: TextButton(
                  style: ButtonStyle(
                    foregroundColor: MaterialStateProperty.all<Color>(Colors.blue),
                  ),
                  onPressed: () {
                    writeData(_enterDataField.text);
                  },

                  child: new Column(
                    children: [
                      new Text('Save Data'),
                      new Padding(padding: EdgeInsets.all(14.0)),
                      new FutureBuilder(
                      future: readData(),
                      builder: (BuildContext context, AsyncSnapshot<String?> data) {
                            if(data.hasData!=null)
                              {
                               return new Text(
                                   data.data.toString(),
                               style: new TextStyle(color: Colors.blueAccent),
                               );
                              }
                            else
                              {
                                return new Text('No Data Saved');
                              }
                      }

                      )],
                  ),
                )


            )
        ));
  }
}




Future<String?> get _localPath async
  {
    final directory = await getApplicationDocumentsDirectory();
    return directory.path;
  }

  Future<File> get _localFile async
  {
    final path =await _localPath;
    return new File('$path/data.txt');
  }

  Future<File> writeData(String? message) async
  {
    final file =await _localFile;
     return file.writeAsString('$message');
  }

  Future<String?> readData() async
  {
    try
    {
    final file =await _localFile;
    String? data = await file.readAsString();
    return data;
    }
    catch(e)
    {
      return "Nothing Saved Yet!";
    }
}

【问题讨论】：

分享更多关于 readData() 和 writeData() 的细节。
@RohitChaursiya 这些是未来的功能，我已经添加...请检查
请检查以下代码。

标签： android ios flutter dart flutter-layout

【解决方案1】：

TextField(
  keyboardType: TextInputType.multiline,
  maxLength: null,
  maxLines: null,
)

【讨论】：

【解决方案2】：

这里我已经尝试解决了。检查下面的代码。


class _HomeState extends State<Home> {
  TextEditingController _enterDataField = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
        appBar: AppBar(
          title: new Text("Read/Write"),
          backgroundColor: Colors.blueAccent,
          centerTitle: true,
        ),
        body: new Container(
            padding: EdgeInsets.all(13.4),
            alignment: Alignment.center,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                ListTile(
                    title: TextField(
                      keyboardType: TextInputType.multiline,
                      controller: _enterDataField,
                      decoration: new InputDecoration(
                        prefixIcon: Icon(Icons.message),
                        border: OutlineInputBorder(),
                        labelText: 'Write Something',
                      ),
                      minLines: 1,
                      maxLines: 10,
                    ),
                    subtitle: TextButton(
                      style: ButtonStyle(
                        foregroundColor:
                            MaterialStateProperty.all<Color>(Colors.blue),
                      ),
                      onPressed: () {
                        setState(() {
                          writeData(_enterDataField.text);
                          readData();
                        });
                      },
                      child: new Text('Save Data'),
                    )),
                Padding(padding: EdgeInsets.all(14.0)),
                FutureBuilder(
                    future: readData(),
                    builder:
                        (BuildContext context, AsyncSnapshot<String?> data) {
                      if (data.hasData != null) {
                        return new Text(
                          data.data.toString(),
                          style: new TextStyle(color: Colors.blueAccent),
                        );
                      } else {
                        return new Text('No Data Saved');
                      }
                    })
              ],
            )));
  }
}

Future<String?> get _localPath async {
  final directory = await getApplicationDocumentsDirectory();
  return directory.path;
}

Future<File> get _localFile async {
  String path = await _localPath as String;

  return File('$path/data.txt');
}

Future<File> writeData(String? message) async {
  final file = await _localFile;
  return file.writeAsString('$message');
}

Future<String?> readData() async {
  try {
    final file = await _localFile;
    String? data = await file.readAsString();
    return data;
  } catch (e) {
    return "Nothing Saved Yet!";
  }
}

【讨论】：