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());
}
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)),
),
);
}
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)),
),
);
}
你也可以为你的文本域声明一个focusNode，当你完成时，你可以在那个focusNode上调用unfocus方法
然后处理它
class MyHomePage extends StatefulWidget {
MyHomePageState createState() => new MyHomePageState();
}
class MyHomePageState extends State<MyHomePage> {
TextEditingController _controller = new TextEditingController();
/// declare focus
final FocusNode _titleFocus = FocusNode();
@override
void dispose() {
_titleFocus.dispose();
}
@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
_titleFocus.unfocus();
_controller.clear();
});
},
),
body: new Container(
alignment: FractionalOffset.center,
padding: new EdgeInsets.all(20.0),
child: new TextFormField(
controller: _controller,
focusNode: _titleFocus,
decoration: new InputDecoration(labelText: 'Example Text'),
),
),
);
}
}
