我无法找到一种方法来创建一个输入字段颤振，将打开一个数字键盘，应该采取数字输入。这是可能的颤振材料部件?一些GitHub讨论似乎表明这是一个受支持的功能，但我无法找到任何关于它的文档。
当前回答
TextField小部件需要设置keyboardType: 和inputFormatters: <TextInputFormatter>[FilteringTextInputFormatter。digitsOnly]只接受数字作为输入。
TextField(
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.digitsOnly
], // Only numbers can be entered
),
在DartPad中的例子
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: HomePage(),
theme: ThemeData(primarySwatch: Colors.blue),
);
}
}
class HomePage extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return HomePageState();
}
}
class HomePageState extends State<HomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: Container(
padding: const EdgeInsets.all(40.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("This Input accepts Numbers only"),
SizedBox(height: 20),
TextField(
decoration: InputDecoration(
focusedBorder: OutlineInputBorder(
borderSide:
BorderSide(color: Colors.greenAccent, width: 5.0),
),
enabledBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.red, width: 5.0),
),
hintText: 'Mobile Number',
),
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.digitsOnly
], // Only numbers can be entered
),
SizedBox(height: 20),
Text("You can test be Typing"),
],
)),
);
}
}
其他回答
通过这个选项，你可以严格限制另一个字符的数字。
inputFormatters: [WhitelistingTextInputFormatter.digitsOnly],
keyboardType: TextInputType.number,
使用上述选项，您必须导入此
import 'package:flutter/services.dart';
使用这种选项，用户不能在文本框中粘贴字符
我需要en IntegerFormField与最小/最大的控制。最大的问题是当焦点改变时，oneditingcomplete没有被调用。以下是我的解决方案:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:vs_dart/vs_dart.dart';
class IntegerFormField extends StatefulWidget {
final int value, min, max;
final InputDecoration decoration;
final ValueChanged<TextEditingController> onEditingComplete;
IntegerFormField({@required this.value, InputDecoration decoration, onEditingComplete, int min, int max})
: min = min ?? 0,
max = max ?? maxIntValue,
onEditingComplete = onEditingComplete ?? ((_) {}),
decoration = decoration ?? InputDecoration()
;
@override
_State createState() => _State();
}
class _State extends State<IntegerFormField> {
final TextEditingController controller = TextEditingController();
@override
void initState() {
super.initState();
controller.text = widget.value.toString();
}
@override
void dispose() {
super.dispose();
}
void onEditingComplete() {
{
try {
if (int.parse(controller.text) < widget.min)
controller.text = widget.min.toString();
else if (int.parse(controller.text) > widget.max)
controller.text = widget.max.toString();
else
FocusScope.of(context).unfocus();
} catch (e) {
controller.text = widget.value.toString();
}
widget.onEditingComplete(controller);
}
}
@override
Widget build(BuildContext context) {
return Focus(
child: TextFormField(
controller: controller,
inputFormatters: [FilteringTextInputFormatter.digitsOnly],
keyboardType: TextInputType.number,
decoration: widget.decoration,
),
onFocusChange: (value) {
if (value)
controller.selection = TextSelection(baseOffset: 0, extentOffset: controller.value.text.length);
else
onEditingComplete();
},
);
}
}
TextField小部件需要设置keyboardType: 和inputFormatters: <TextInputFormatter>[FilteringTextInputFormatter。digitsOnly]只接受数字作为输入。
TextField(
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.digitsOnly
], // Only numbers can be entered
),
在DartPad中的例子
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: HomePage(),
theme: ThemeData(primarySwatch: Colors.blue),
);
}
}
class HomePage extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return HomePageState();
}
}
class HomePageState extends State<HomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: Container(
padding: const EdgeInsets.all(40.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("This Input accepts Numbers only"),
SizedBox(height: 20),
TextField(
decoration: InputDecoration(
focusedBorder: OutlineInputBorder(
borderSide:
BorderSide(color: Colors.greenAccent, width: 5.0),
),
enabledBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.red, width: 5.0),
),
hintText: 'Mobile Number',
),
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.digitsOnly
], // Only numbers can be entered
),
SizedBox(height: 20),
Text("You can test be Typing"),
],
)),
);
}
}
仅限号码类型
keyboardType: TextInputType.number
和更多的选择与数字垫
keyboardType: TextInputType.numberWithOptions(decimal: true,signed: false)
以下是Flutter中实际手机键盘的代码:
//Mobile
const TextField(
keyboardType: TextInputType.number,
decoration: InputDecoration(
prefixIcon: Icon(Icons.phone), hintText: 'Mobile'),
),
