android - 有没有办法在 flutter 中为 DropdownButton 添加标签？

Question

我正在尝试获得这种设计:1
[标签]:[下拉列表]
[标签]:[文本字​​段]
[标签]:[下拉列表]

我已经能够使用此代码实现下拉菜单:

  List<String> _locations = ['Cita', 'Junta', 'Proyecto', 'Examen', 'Otro']; // Option 2
  String _selectedLocation; // Option 2

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Crear Evento'),
      ),
      body: Center(
        child: Container(
          width: double.infinity,
          height: 400,
          padding: EdgeInsets.symmetric(horizontal: 20),
          alignment: Alignment.center,
          child: Column(
            children: <Widget>[
              new Text('Categoría'),
              DropdownButton(
                hint: Text('Categoría'), // Not necessary for Option 1
                value: _selectedLocation,
                onChanged: (newValue) {
                  setState(() {
                    _selectedLocation = newValue;
                  });
                },
                items: _locations.map((location) {
                  return DropdownMenuItem(
                    child: new Text(location),
                    value: location,
                  );
                }).toList(),
              ),
            ],
          ),
        ),
      ),
    );

但是，此输出不是我想要的方式，因为输出格式为:2
[标签]

PS.: 我知道这不是一个正确的标签，因为它只是一个文本，如果有人能帮助我，那就太好了，在此先感谢。

Answer 1

如果我得到了您想要的正确结果，您将需要使用 Row (了解更多 here )来执行此操作，如下例所示，使用您的代码:

List<String> _locations = ['Cita', 'Junta', 'Proyecto', 'Examen', 'Otro']; // Option 2
  String _selectedLocation; // Option 2

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Crear Evento'),
      ),
      body: Center(
        child: Container(
          width: double.infinity,
          height: 400,
          padding: EdgeInsets.symmetric(horizontal: 20),
          alignment: Alignment.center,
          child: Column(
            children: <Widget>[
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  Text('Categoría'),
                  Container(width: 8),
                  DropdownButton(
                    hint: Text('Categoría'), // Not necessary for Option 1
                    value: _selectedLocation,
                    onChanged: (newValue) {
                      setState(() {
                        _selectedLocation = newValue;
                      });
                    },
                    items: _locations.map((location) {
                      return DropdownMenuItem(
                        child: new Text(location),
                        value: location,
                      );
                    }).toList(),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );

产生这个: