如何解除屏幕上的键盘?

我用TextFormField收集用户输入，当用户按下FloatingActionButton表示他们已经完成时，我想解散屏幕上的键盘。

如何让键盘自动消失?

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  MyHomePageState createState() => new MyHomePageState();
}

class MyHomePageState extends State<MyHomePage> {
  TextEditingController _controller = new TextEditingController();

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(),
      floatingActionButton: new FloatingActionButton(
        child: new Icon(Icons.send),
        onPressed: () {
          setState(() {
            // send message
            // dismiss on screen keyboard here
            _controller.clear();
          });
        },
      ),
      body: new Container(
        alignment: FractionalOffset.center,
        padding: new EdgeInsets.all(20.0),
        child: new TextFormField(
          controller: _controller,
          decoration: new InputDecoration(labelText: 'Example Text'),
        ),
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new MyHomePage(),
    );
  }
}

void main() {
  runApp(new MyApp());
}

当前回答

_dismissKeyboard(BuildContext context) {
   FocusScope.of(context).requestFocus(new FocusNode());
}

@override
Widget build(BuildContext context) {

return new GestureDetector(
    onTap: () {
    this._dismissKeyboard(context);
    },
    child: new Container(
    color: Colors.white,
    child: new Column(
        children: <Widget>[/*...*/],
    ),
    ),
 );
}

2019-08-14 13:19:14

其他回答

如果你的键盘仍然不会关闭，不要忘记添加focusNode到TextField。上面的信息很有帮助，但是忘记添加focusNode让我有点困扰。这里有一个例子。

TextField(
          focusNode: FocusNode(),
          textController: _controller,
          autoFocus: false,
          textStyle: TextStyle(fontSize: 14),
          onFieldSubmitted: (text) {},
          onChanged: (text) {},
          hint: 'Enter the code',
          hintColor: CustomColors.mediumGray,
          suffixAsset: _voucherController.text.length == 7
              ? Assets.ic_approved_voucher
              : null,
          isIcon: false,
          isObscure: false,
          maxLength: 7,
        )



closeKeyboard(BuildContext context) {
    var currentFocus = FocusScope.of(context);
    if (!currentFocus.hasPrimaryFocus) {
      currentFocus.unfocus();
    }
  }

  @override
  Widget build(BuildContext context) {
    _keyboardVisible = MediaQuery.of(context).viewInsets.bottom != 0;
    size = MediaQuery.of(context).size;
    return GestureDetector(
      onTap: () {
        closeKeyboard(context);
      },
      child: Scaffold(
        backgroundColor: Colors.white,
        body: Container(
            width: double.maxFinite,
            height: double.maxFinite,
            child: _buildUI(vm)),
      ),
    );
  }

2021-10-04 13:22:34

注意:这个答案已经过时了。有关Flutter的新版本，请参阅答案。

你可以通过把TextFormField的焦点拿走，并把它给一个未使用的FocusNode来解散键盘:

FocusScope.of(context).requestFocus(FocusNode());

2017-07-09 00:44:06

_dismissKeyboard(BuildContext context) {
   FocusScope.of(context).requestFocus(new FocusNode());
}

@override
Widget build(BuildContext context) {

return new GestureDetector(
    onTap: () {
    this._dismissKeyboard(context);
    },
    child: new Container(
    color: Colors.white,
    child: new Column(
        children: <Widget>[/*...*/],
    ),
    ),
 );
}

2019-08-14 13:19:14

这可能会简化情况。下面的代码只在键盘打开时才会工作

if(FocusScope.of(context).isFirstFocus) {
 FocusScope.of(context).requestFocus(new FocusNode());
}

2020-11-06 06:45:20

在Flutter中，一切都是一个小部件，我决定包装FocusScope.of(context).unfocus();在一个简短的实用程序小部件中实现。

只需创建KeyboardHider小部件:

import 'package:flutter/widgets.dart';

/// A widget that upon tap attempts to hide the keyboard.
class KeyboardHider extends StatelessWidget {
  /// Creates a widget that on tap, hides the keyboard.
  const KeyboardHider({
    required this.child,
    Key? key,
  }) : super(key: key);

  /// The widget below this widget in the tree.
  final Widget child;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      behavior: HitTestBehavior.opaque,
      onTap: () => FocusScope.of(context).unfocus(),
      child: child,
    );
  }
}

现在，您可以用KeyboardHider小部件包装任何小部件(在使用好的IDE时非常方便)，然后当您点击某个东西时，键盘将自动关闭。它与表单和其他可点击区域一起工作得很好。

class SimpleWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return KeyboardHider(
      /* Here comes a widget tree that eventually opens the keyboard,
       * but the widget that opened the keyboard doesn't necessarily
       * takes care of hiding it, so we wrap everything in a
       * KeyboardHider widget */
      child: Container(),
    );
  }
}

2019-04-17 12:16:49

如何解除屏幕上的键盘?

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