Flutter:带有 TextField/TextFormField 的 Bottom Sheet

Question

在我们的应用程序的一部分中，我希望在 BottomSheet 中有一个简单的表单，就像下面的代码一样。不幸的是，当我输入它时，我得到了一个错误

The following assertion was thrown during performLayout(): AnInputDecorator, which is typically created by a TextField, cannot havean unbounded width. This happens when the parent widget does notprovide a finite width constraint. For example, if the InputDecoratoris contained by a Row, then its width must be constrained. An Expandedwidget or a SizedBox can be used to constrain the width of theInputDecorator or the TextField that contains it.'package:flutter/src/material/input_decorator.dart': Failed assertion:line 881 pos 7: 'layoutConstraints.maxWidth < double.infinity'

我实现的代码:

  void _settingModalBottomSheet(context){
    showModalBottomSheet(
        context: context,
        elevation: 8.0,
        builder: (BuildContext bc){
          return Directionality(
            textDirection: TextDirection.rtl,
            child: ConstrainedBox(
              constraints: BoxConstraints(
                minHeight: 250.0
              ),
              child: Container(
                padding: EdgeInsets.fromLTRB(0.0,10.0,0.0,10.0),
                child: new Wrap(
                  children: <Widget>[
                    Padding(
                      padding: const EdgeInsets.all(8.0),
                      child: Center(
                        child: Text(
                          'please fill this form',
                          style: TextStyle(
                            fontSize: 13.0,
                          ),
                        ),
                      ),
                    ),
                    Divider(),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      crossAxisAlignment: CrossAxisAlignment.center,
                      children: <Widget>[
                        Column(
                          children: <Widget>[
                            Text('item 1'),
                            Container(
                              child: TextField(),
                            )
                          ],
                        ),
                        Column(
                          children: <Widget>[
                            Text('item 2'),
                            Container(
                              child: TextField(),
                            )
                          ],
                        ),

                      ],
                    ),
                  ],
                ),
              ),
            ),
          );
        }
    );
  }

Answer 1

您必须为 TextField 提供特定宽度，只需在您的 Container 中提供 width 或包装您的 Column 在 Expanded 中。

解决方案一

Container(
  width: 100, // do it in both Container
  child: TextField(),
),

---

方案二

Row(
  mainAxisAlignment: MainAxisAlignment.center,
  crossAxisAlignment: CrossAxisAlignment.center,
  children: <Widget>[
    Expanded( // wrap your Column in Expanded
      child: Column(
        children: <Widget>[
          Text('item 1'),
          Container(child: TextField()),
        ],
      ),
    ),
    Expanded( // wrap your Column in Expanded
      child: Column(
        children: <Widget>[
          Text('item 2'),
          Container(child: TextField()),
        ],
      ),
    ),
  ],
),