如何在Flutter中删除TextField底部的空格？ [英] How to remove Space at the bottom of TextField in flutter?

问题描述

我不知道为什么 TextField底部有空格在文本和蓝线之间。

I can't figure out why there is space at the bottom of TextField between the text and the blue line.

这是我的代码：

Future<Null> _selectNoteType (BuildContext context) async {

  switch (await showDialog<Null>(

      context: context,
      builder: (BuildContext context) {

        return new SimpleDialog(

          title: const Text('Select Note Type'),
          children: <Widget>[

            Padding(
              padding: const EdgeInsets.only(left: 8.0, right: 8.0),
              child: new TextField(
                keyboardType: TextInputType.text,
                maxLines: 1,
                style: new TextStyle(
                  color: Colors.black,
                  fontSize: 20.0
                ),
              ),
            ),

            new SimpleDialogOption(
                onPressed: () {},
                child: const Text('Text')
              ),

            new SimpleDialogOption(
              onPressed: () {},
              child: const Text('Checklist')
            ),
          ],
        );
      }
  )) {}
}

推荐答案

您可以对<$ c $的 decoration：属性使用折叠的 InputDecoration c> TextField 。

You can use a collapsed InputDecoration for the decoration: property of the TextField.

  Future<Null> _selectNoteType(BuildContext context) async {

    InputDecoration decoration = const InputDecoration.collapsed()
      ..applyDefaults(Theme.of(context).inputDecorationTheme);

    switch (await showDialog<Null>(
        context: context,
        builder: (BuildContext context) {
          return new SimpleDialog(
            title: const Text('Select Note Type'),
            children: <Widget>[
              Padding(
                padding: const EdgeInsets.only(left: 8.0, right: 8.0),
                child: new TextField(
                  decoration: decoration,
                  keyboardType: TextInputType.text,
                  maxLines: 1,
                  style: new TextStyle(color: Colors.black, fontSize: 20.0),
                ),
              ),
              new SimpleDialogOption(
                  onPressed: () {}, child: const Text('Text')),
              new SimpleDialogOption(
                  onPressed: () {}, child: const Text('Checklist')),
            ],
          );
        })) {
    }
  }

但是您必须知道使用折叠的 InputDecoration 的后果。从文档中：

But you must know the consequences of using a collapsed InputDecoration. From the documentation:

  /// Whether the decoration is the same size as the input field.
  ///
  /// A collapsed decoration cannot have [labelText], [errorText], an [icon].
  ///
  /// To create a collapsed input decoration, use [InputDecoration..collapsed].
  final bool isCollapsed;

对于 InputDecoration.collapse（）构造函数：

  /// Defines an [InputDecorator] that is the same size as the input field.
  ///
  /// This type of input decoration does not include a border by default.
  ///
  /// Sets the [isCollapsed] property to true.
  const InputDecoration.collapsed({

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