Flutter 颤振v1.12.13+;热修复程序.5 FocusNode意外行为
我将焦点节点添加到textformfield。在我将flutter版本升级到v1.12.13+热修复程序.5之后,flatterfocusnode出现了意想不到的异常Flutter 颤振v1.12.13+;热修复程序.5 FocusNode意外行为,flutter,flutter-dependencies,Flutter,Flutter Dependencies,我将焦点节点添加到textformfield。在我将flutter版本升级到v1.12.13+热修复程序.5之后,flatterfocusnode出现了意想不到的异常 @override void initState() { super.initState(); focusNode.addListener(() async { if(focusNode.hasFocus) { Navigator.push( context, MaterialPageRoute(
@override
void initState() {
super.initState();
focusNode.addListener(() async {
if(focusNode.hasFocus)
{
Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondRoute()),
);
}
}
}
TextFormField(
style: TextStyle(color: Theme.of(context).brightness==Brightness.dark?Colors.white:Colors.grey),
readOnly: true,
validator: validateField,
focusNode: focusNode,
controller: controller,
);
我单击textformfield打开第二页。但当我关闭第二页时,第二页会自动打开。此行为发生在我将版本升级到v1.12.13+修补程序之后。5
v1.12.13+修补程序5中focusNode的真正用法是什么?您可以复制下面的粘贴运行完整代码
因为从
SecondRoute
返回时TextFormField
仍有foucs
,所以需要执行unfocus
代码片段
focusNode.addListener(() async {
if (focusNode.hasFocus) {
await Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondRoute()),
);
FocusScope.of(context).requestFocus(new FocusNode());
}
});
工作演示
完整代码
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
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> {
int _counter = 0;
final controller = TextEditingController();
FocusNode focusNode = new FocusNode();
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
void initState() {
super.initState();
focusNode.addListener(() async {
if (focusNode.hasFocus) {
await Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondRoute()),
);
FocusScope.of(context).requestFocus(new FocusNode());
}
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextFormField(
style: TextStyle(
color: Theme.of(context).brightness == Brightness.dark
? Colors.white
: Colors.grey),
readOnly: true,
//validator: validateField,
focusNode: focusNode,
controller: controller,
),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
class SecondRoute extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Second Route"),
),
body: Center(
child: RaisedButton(
onPressed: () {
Navigator.pop(context);
},
child: Text('Go back!'),
),
),
);
}
}
导入“包装:颤振/材料.省道”;
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
//此小部件是应用程序的根。
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
int _计数器=0;
最终控制器=文本编辑控制器();
FocusNode FocusNode=新的FocusNode();
void _incrementCounter(){
设置状态(){
_计数器++;
});
}
@凌驾
void initState(){
super.initState();
focusNode.addListener(()异步{
if(focusNode.hasFocus){
等待导航器(
上下文
MaterialPartnerRoute(生成器:(上下文)=>SecondRoute()),
);
FocusScope.of(context).requestFocus(newfocusnode());
}
});
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(widget.title),
),
正文:中(
子:列(
mainAxisAlignment:mainAxisAlignment.center,
儿童:[
TextFormField(
样式:TextStyle(
颜色:Theme.of(context).brightness==brightness.dark
?颜色:白色
:颜色。灰色),
只读:对,
//验证程序:validateField,
focusNode:focusNode,
控制器:控制器,
),
正文(
“您已经按了这么多次按钮:”,
),
正文(
“$”计数器“,
样式:Theme.of(context).textTheme.display1,
),
],
),
),
浮动操作按钮:浮动操作按钮(
按下时:\ u递增计数器,
工具提示:“增量”,
子:图标(Icons.add),
),
);
}
}
类SecondRoute扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(“第二条路线”),
),
正文:中(
孩子:升起按钮(
已按下:(){
Navigator.pop(上下文);
},
child:Text('Go back!'),
),
),
);
}
}
很乐意帮忙。如果这对您有帮助,请将其标记为答案。谢谢