本文介绍了颤振键盘完成按钮导致文本字段内容消失的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在表格中有2个文本字段.当我在第二个文本字段中单击键盘上的完成按钮时，键盘将隐藏并且两个文本字段都为空.当我手动关闭键盘时，同样的情况也会丢失，文本字段的内容也会丢失.似乎每次发生时屏幕都会刷新.为什么会这样?
I have 2 textfields in a form. When i click on done button on keyboard in the second text field , keyboard hides and both the text fields get empty. The same happes when i closes the keyboard manually, then also the content of the textfields get lost.It looks like the screen gets refresh evertime this happens. why is it so?
@override
Widget build(BuildContext context) {
TextEditingController nameTextFieldController = TextEditingController();
TextEditingController emailTextFieldController = TextEditingController();
FocusNode emailFocusNode = new FocusNode();
// TODO: implement build
return WillPopScope(
onWillPop: () {
moveToLastScreen();
},
child: Scaffold(
appBar: AppBar(
title: Text("Signup"),
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: () {
moveToLastScreen();
}),
),
body: Form(
key: _formKey,
child: Container(
child: ListView(
padding: EdgeInsets.only(top: 20, left: 35, right: 35),
children: <Widget>[
Center(
child: GestureDetector(
onTap: () {
imageSelectorGalary();
},
child: new Container(
width: 100.0,
height: 100.0,
child: _image == null
? new Image.asset(
'images/profilepic.png',
fit: BoxFit.fitWidth,
)
: new CircleAvatar(
backgroundImage: new FileImage(_image),
radius: 200.0,
)))),
Text(
"NAME",
style: TextStyle(fontWeight: FontWeight.bold),
),
Padding(
padding: EdgeInsets.only(top: 5, bottom: 10),
child: TextFormField(
inputFormatters:[
LengthLimitingTextInputFormatter(10),
],
onFieldSubmitted: (String value){
FocusScope.of(context).requestFocus(emailFocusNode);
},
keyboardType: TextInputType.text,
controller: nameTextFieldController,
validator: (String value) {
if (value.isEmpty) {
return 'Please enter the name';
}
},
decoration: InputDecoration(
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(5.0)),
contentPadding: EdgeInsets.only(
top: 15, bottom: 15, left: 20, right: 20))),
),
Text(
"EMAIL ID",
style: TextStyle(fontWeight: FontWeight.bold),
),
Padding(
padding: EdgeInsets.only(top: 5, bottom: 10),
child: TextFormField(
controller: emailTextFieldController,
focusNode: emailFocusNode ,
onFieldSubmitted: (String value){
FocusScope.of(context).requestFocus(new FocusNode());
},
validator: (String value){
if(value.isEmpty){
return "Please enter your email-id";
}
},
decoration: InputDecoration(
contentPadding: EdgeInsets.only(
top: 15, bottom: 15, left: 20, right: 20),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(5.0))),
),
),
Text(
"CITY AND AREA",
style: TextStyle(fontWeight: FontWeight.bold),
),
GestureDetector(
onTap: () {
CityAreasDialog cityAreasDialog =
new CityAreasDialog();
cityAreasDialog.information(context);
},
child: Container(
margin: EdgeInsets.only(top: 5, bottom: 10),
padding: EdgeInsets.only(left: 20, right: 20),
decoration: new BoxDecoration(
border: new Border.all(color: CustomColors.grey),
borderRadius: BorderRadius.all(Radius.circular(
5.0) // <--- border radius here
)),
child: Container(
padding: EdgeInsets.only(top: 10, bottom: 10),
child: Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween,
children: <Widget>[
Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: <Widget>[
Text("Select Your City"),
Text(
"and area",
style: TextStyle(
color: Colors.grey, fontSize: 10),
)
],
),
Icon(
Icons.arrow_drop_down,
color: Colors.black,
)
],
)),
)),
Container(
margin: EdgeInsets.only(top: 20, left: 10, right: 10),
child: RaisedButton(
onPressed: () {
debugPrint("Next Click");
onSignup();
},
child: new Text(
"NEXT",
),
))
],
),
)),
));
}
推荐答案
此问题是因为每次重新构建窗口小部件时，您都在创建新的 TextEditingController .因此，要解决此问题，请将这些变量 nameTextFieldController ， emailTextFieldController 移至构建方法之外.
This issue is because you are creating new TextEditingController every time your widget is rebuilt.So to fix this issue, move these variables nameTextFieldController ,emailTextFieldController outside your build method.
赞:
TextEditingController nameTextFieldController = TextEditingController();
TextEditingController emailTextFieldController = TextEditingController();
@override
Widget build(BuildContext context) {
...
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