Bagaimana cara menutup keyboard di layar?

Saya mengumpulkan input pengguna dengan a TextFormFielddan ketika pengguna menekan tanda FloatingActionButtonbahwa mereka sudah selesai, saya ingin menutup keyboard di layar.

Bagaimana cara membuat keyboard hilang secara otomatis?

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());
}

Pada Flutter v1.7.8 + hotfix.2, cara yang harus dilakukan adalah:

FocusScope.of(context).unfocus()

Komentar PR tentang itu:

Sekarang # 31909 (be75fb3) telah mendarat, Anda harus menggunakan FocusScope.of(context).unfocus()bukan FocusScope.of(context).requestFocus(FocusNode()), karena FocusNodes adalah ChangeNotifiers, dan harus dibuang dengan benar.

-> JANGAN gunakan ̶r̶e̶q̶u̶e̶s̶t̶F̶o̶c̶u̶s̶(̶F̶o̶c̶u̶s̶N̶o̶d̶e̶(̶)̶lagi.

 F̶o̶c̶u̶s̶S̶c̶o̶p̶e̶.̶o̶f̶(̶c̶o̶n̶t̶e̶x̶t̶)̶.̶r̶e̶q̶u̶e̶s̶t̶F̶o̶c̶u̶s̶(̶F̶o̶c̶u̶s̶N̶o̶d̶e̶(̶)̶)̶;̶

Catatan: Jawaban ini sudah ketinggalan zaman. Lihat jawabannya untuk Flutter versi terbaru .

Anda dapat menutup keyboard dengan menghilangkan fokus TextFormFielddan memberikannya ke yang tidak digunakan FocusNode:

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

Solusi dengan FocusScope tidak berhasil untuk saya. Saya menemukan yang lain:

import 'package:flutter/services.dart';

SystemChannels.textInput.invokeMethod('TextInput.hide');

Itu memecahkan masalah saya.

Untuk Flutter 1.17.3 (saluran stabil per Juni 2020), gunakan

FocusManager.instance.primaryFocus.unfocus();

Tidak ada solusi di atas yang tidak berhasil untuk saya.

Flutter menyarankan ini - Letakkan widget Anda di dalam GestureDetector baru () di mana ketukan akan menyembunyikan keyboard dan onTap menggunakan FocusScope.of (konteks) .requestFocus (new FocusNode ())

class Home extends StatelessWidget {
@override
  Widget build(BuildContext context) {
    var widget = new MaterialApp(
        home: new Scaffold(
            body: new Container(
                height:500.0,
                child: new GestureDetector(
                    onTap: () {
                        FocusScope.of(context).requestFocus(new FocusNode());
                    },
                    child: new Container(
                        color: Colors.white,
                        child:  new Column(
                            mainAxisAlignment:  MainAxisAlignment.center,
                            crossAxisAlignment: CrossAxisAlignment.center,

                            children: [
                                new TextField( ),
                                new Text("Test"),                                
                            ],
                        )
                    )
                )
            )
        ),
    );

    return widget;
}}

Kode berikut membantu saya menyembunyikan keyboard

   void initState() {
   SystemChannels.textInput.invokeMethod('TextInput.hide');
   super.initState();
   }

Contoh implementasi .unfocus () untuk menyembunyikan keyboard secara otomatis saat menggulir daftar

FocusScope.of(context).unfocus();

Anda dapat menemukannya di

https://github.com/flutter/flutter/issues/36869#issuecomment-518118441

Terima kasih untuk szotp

GestureDetector(
          onTap: () {
            FocusScope.of(context).unfocus();
          },
          child:Container(
    alignment: FractionalOffset.center,
    padding: new EdgeInsets.all(20.0),
    child: new TextFormField(
      controller: _controller,
      decoration: new InputDecoration(labelText: 'Example Text'),
    ),
  ), })

coba ini pada gerakan ketuk

Karena di Flutter semuanya adalah widget, saya memutuskan untuk membungkus SystemChannels.textInput.invokeMethod('TextInput.hide');dan FocusScope.of(context).requestFocus(FocusNode());pendekatan dalam modul utilitas singkat dengan widget dan mixin di dalamnya.

Dengan widget, Anda dapat menggabungkan widget apa pun (sangat nyaman jika menggunakan dukungan IDE yang bagus) dengan KeyboardHiderwidget:

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(),
    );
  }
}

Dengan mixin, Anda dapat memicu persembunyian keyboard dari status atau widget apa pun pada interaksi apa pun:

class SimpleWidget extends StatefulWidget {
  @override
  _SimpleWidgetState createState() => _SimpleWidgetState();
}

class _SimpleWidgetState extends State<SimpleWidget> with KeyboardHiderMixin {
  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      onPressed: () {
        // Hide the keyboard:
        hideKeyboard();
        // Do other stuff, for example:
        // Update the state, make an HTTP request, ...
      },
    );
  }
}

Cukup buat keyboard_hider.dartfile dan widget dan mixin siap digunakan:

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

/// Mixin that enables hiding the keyboard easily upon any interaction or logic
/// from any class.
abstract class KeyboardHiderMixin {
  void hideKeyboard({
    BuildContext context,
    bool hideTextInput = true,
    bool requestFocusNode = true,
  }) {
    if (hideTextInput) {
      SystemChannels.textInput.invokeMethod('TextInput.hide');
    }
    if (context != null && requestFocusNode) {
      FocusScope.of(context).requestFocus(FocusNode());
    }
  }
}

/// A widget that can be used to hide the text input that are opened by text
/// fields automatically on tap.
///
/// Delegates to [KeyboardHiderMixin] for hiding the keyboard on tap.
class KeyboardHider extends StatelessWidget with KeyboardHiderMixin {
  final Widget child;

  /// Decide whether to use
  /// `SystemChannels.textInput.invokeMethod('TextInput.hide');`
  /// to hide the keyboard
  final bool hideTextInput;
  final bool requestFocusNode;

  /// One of hideTextInput or requestFocusNode must be true, otherwise using the
  /// widget is pointless as it will not even try to hide the keyboard.
  const KeyboardHider({
    Key key,
    @required this.child,
    this.hideTextInput = true,
    this.requestFocusNode = true,
  })  : assert(child != null),
        assert(hideTextInput || requestFocusNode),
        super(key: key);

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      behavior: HitTestBehavior.opaque,
      onTap: () {
        hideKeyboard(
          context: context,
          hideTextInput: hideTextInput,
          requestFocusNode: requestFocusNode,
        );
      },
      child: child,
    );
  }
}

Anda dapat menggunakan unfocus()metode dari FocusNodekelas.

import 'package:flutter/material.dart';

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

class MyHomePageState extends State<MyHomePage> {
  TextEditingController _controller = new TextEditingController();
  FocusNode _focusNode = new FocusNode(); //1 - declare and initialize variable

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(),
      floatingActionButton: new FloatingActionButton(
        child: new Icon(Icons.send),
        onPressed: () {
            _focusNode.unfocus(); //3 - call this method here
        },
      ),
      body: new Container(
        alignment: FractionalOffset.center,
        padding: new EdgeInsets.all(20.0),
        child: new TextFormField(
          controller: _controller,
          focusNode: _focusNode, //2 - assign it to your TextFormField
          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());
}

Sepertinya pendekatan berbeda untuk versi berbeda. Saya menggunakan Flutter v1.17.1 dan yang di bawah ini berfungsi untuk saya.

onTap: () {
    FocusScopeNode currentFocus = FocusScope.of(context);
    if (!currentFocus.hasPrimaryFocus && currentFocus.focusedChild != null) {
       currentFocus.focusedChild.unfocus();
    }
}

_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>[/*...*/],
    ),
    ),
 );
}

coba gunakan pengontrol pengeditan teks. di awal,

    final myController = TextEditingController();
     @override
  void dispose() {
    // Clean up the controller when the widget is disposed.
    myController.dispose();
    super.dispose();
  }

dan di acara pers,

onPressed: () {
            commentController.clear();}

ini akan menutup keybord.