Flutter 颤振-点击时动态更改文本输入类型和输入格式
我想在点击时动态更改文本字段的文本输入类型和输入格式设置。但是问题是,一旦文本输入类型完成,它就不会在点击时更改,而标签文本的行为与预期一致 我做了如下的事情Flutter 颤振-点击时动态更改文本输入类型和输入格式,flutter,dart,dynamic,textfield,inputformatter,Flutter,Dart,Dynamic,Textfield,Inputformatter,我想在点击时动态更改文本字段的文本输入类型和输入格式设置。但是问题是,一旦文本输入类型完成,它就不会在点击时更改,而标签文本的行为与预期一致 我做了如下的事情 bool joinlinkname = false; joinchanged() { if (joinlinkname == false) { setState(() { joinlinkname = true; }); } else { setState(() { joinlinkna
bool joinlinkname = false;
joinchanged() {
if (joinlinkname == false) {
setState(() {
joinlinkname = true;
});
} else {
setState(() {
joinlinkname = false;
});
}
}
TextField(
keyboardType: joinlinkname? TextInputType.text : TextInputType.phone,
labelText: joinlinkname ? 'num' : "text",
inputFormatters: [joinlinkname ?
FilteringTextInputFormatter.allow(RegExp('[azAZ09]')):FilteringTextInputFormatter.allow(RegExp('[0-9]')),
],
),
GestureDetector(
onTap: () {
joinchanged();
},
child: Text(joinlinkname ? 'number' : 'text',
style: TextStyle(
color: Colors.blue,
fontSize: 12,
),
),
),
有人能告诉你怎么做吗?你可以在下面复制粘贴运行完整代码
您可以使用
ValueListenableBuilder
和ValueNotifier
您还需要
FocusNode
来控制键盘您可以看到下面的工作演示
代码片段
final ValueNotifier<bool> joinlinkname = ValueNotifier<bool>(false);
...
joinchanged() async {
FocusManager.instance.primaryFocus.unfocus();
joinlinkname.value = !joinlinkname.value;
await Future.delayed(Duration(milliseconds: 500), () {});
myFocusNode.requestFocus();
}
...
ValueListenableBuilder(
builder: (BuildContext context, bool value, Widget child) {
return Column(
children: [
GestureDetector(
onTap: () {
joinchanged();
},
child: Text(
joinlinkname.value ? 'number' : 'text',
style: TextStyle(
color: Colors.blue,
fontSize: 12,
),
),
),
TextField(
focusNode: myFocusNode,
keyboardType: joinlinkname.value
? TextInputType.phone
final ValueNotifier joinlinkname=ValueNotifier(false);
...
joinchanged()异步{
FocusManager.instance.primaryFocus.unfocus();
joinlinkname.value=!joinlinkname.value;
等待未来。延迟(持续时间(毫秒:500),({});
myFocusNode.requestFocus();
}
...
ValueListenableBuilder(
生成器:(BuildContext上下文、bool值、小部件子项){
返回列(
儿童:[
手势检测器(
onTap:(){
joinchanged();
},
子:文本(
joinlinkname.value?'number':'text',
样式:TextStyle(
颜色:颜色,蓝色,
尺寸:12,
),
),
),
文本字段(
focusNode:myFocusNode,
键盘类型:joinlinkname.value
?TextInputType.phone
工作演示
完整代码
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final ValueNotifier<bool> joinlinkname = ValueNotifier<bool>(false);
FocusNode myFocusNode;
@override
void initState() {
super.initState();
myFocusNode = FocusNode();
}
@override
void dispose() {
myFocusNode.dispose();
super.dispose();
}
joinchanged() async {
FocusManager.instance.primaryFocus.unfocus();
joinlinkname.value = !joinlinkname.value;
await Future.delayed(Duration(milliseconds: 500), () {});
myFocusNode.requestFocus();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text(widget.title)),
body: Center(
child: ValueListenableBuilder(
builder: (BuildContext context, bool value, Widget child) {
return Column(
children: [
GestureDetector(
onTap: () {
joinchanged();
},
child: Text(
joinlinkname.value ? 'number' : 'text',
style: TextStyle(
color: Colors.blue,
fontSize: 12,
),
),
),
TextField(
focusNode: myFocusNode,
keyboardType: joinlinkname.value
? TextInputType.phone
: TextInputType.text,
decoration: InputDecoration(
labelText: joinlinkname.value ? 'num' : "text",
),
inputFormatters: [
joinlinkname.value
? FilteringTextInputFormatter.allow(RegExp('[0-9]'))
: FilteringTextInputFormatter.allow(RegExp('[azAZ09]')),
],
),
],
);
},
valueListenable: joinlinkname,
),
),
);
}
}
导入“包装:颤振/材料.省道”;
导入“包:flifter/services.dart”;
void main(){
runApp(MyApp());
}
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
视觉密度:视觉密度。自适应平台密度,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
最终ValueNotifier joinlinkname=ValueNotifier(假);
粘液囊;
@凌驾
void initState(){
super.initState();
myFocusNode=FocusNode();
}
@凌驾
无效处置(){
myFocusNode.dispose();
super.dispose();
}
joinchanged()异步{
FocusManager.instance.primaryFocus.unfocus();
joinlinkname.value=!joinlinkname.value;
等待未来。延迟(持续时间(毫秒:500),({});
myFocusNode.requestFocus();
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(标题:Text(widget.title)),
正文:中(
子项:ValueListenableBuilder(
生成器:(BuildContext上下文、bool值、小部件子项){
返回列(
儿童:[
手势检测器(
onTap:(){
joinchanged();
},
子:文本(
joinlinkname.value?'number':'text',
样式:TextStyle(
颜色:颜色,蓝色,
尺寸:12,
),
),
),
文本字段(
focusNode:myFocusNode,
键盘类型:joinlinkname.value
?TextInputType.phone
:TextInputType.text,
装饰:输入装饰(
labelText:joinlinkname.value?'num':“text”,
),
输入格式化程序:[
joinlinkname.value
?FilteringtExputFormatter.allow(RegExp(“[0-9]”)
:FilteringtExputFormatter.allow(RegExp(“[azAZ09]”)),
],
),
],
);
},
valueListenable:joinlinkname,
),
),
);
}
}
提前感谢大家!!!非常感谢!!!@chunhunghan,也许你也能帮我解决这个问题。。