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());
}
======解散键盘后，点击TextField =======
@override
Widget build(BuildContext context) {
return GestureDetector(
onTap: () => FocusScope.of(context).unfocus(), //this will dismiss keyboard
child: Scaffold(
body: SafeArea(
.........
======滚动屏幕时关闭键盘=======
ListView(
keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag, //this will dismiss
children: [
..........
SingleChildScrollView小部件也有这个属性。
对于Flutter版本2或最新版本:
由于颤振2零安全，这是最好的方法:
FocusManager.instance.primaryFocus?.unfocus();
注意:使用旧的方法会导致一些问题，如保持重建状态;
对于颤动版本< 2:
自Flutter v1.7.8+热修复。2、要走的路是:
FocusScope.of(context).unfocus();
评论一下PR:
现在#31909 (be75fb3)已经着陆，您应该使用
FocusScope.of(context).unfocus()代替
FocusScope.of(context).requestFocus(FocusNode())，因为FocusNodes
ChangeNotifiers，并且应该正确地处理。
- >不使用q r e̶̶̶̶̶u e̶s t F c o̶̶̶̶̶u s̶̶(F c o̶̶̶̶̶u s e N o d̶̶̶̶̶̶̶了。
F̶o̶c̶u̶s̶S̶c̶o̶p̶e̶.̶o̶f̶(̶c̶o̶n̶t̶e̶x̶t̶)̶.̶r̶e̶q̶u̶e̶s̶t̶F̶o̶c̶u̶s̶(̶F̶o̶c̶u̶s̶N̶o̶d̶e̶(̶)̶)̶;̶
在flutter文档中阅读有关FocusScope类的更多信息。
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)),
),
);
}
