本文介绍了每次抖动时如何更新 SharedPreferences 值的处理方法，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
我正在尝试获取一些保存在 SharedPreferences 中的值.我有一些带有提示文本和底部导航的文本字段.输入到文本字段中的文本将保存到共享首选项.我创建了名为 loadUserData(); 的类.使用 SharedPreferences 在本地保存数据.
I am trying to get some values saved in the SharedPreferences . I have a few textfields with hint text and bottom navigation. Text entered into the textfield will be saved to shared preferences. I created class named loadUserData(); to save data locally using SharedPreferences .
void initState() {
super.initState();
isButtonDisabled = false;
loadUserData();
myFocusNode = FocusNode();
telephoneNode = FocusNode();
adresseNode = FocusNode();
emailNode = FocusNode();
passwordNode = FocusNode();
// future = boxApi.getUser();
// future = loadUserData();
}
loadUserData() async {
SharedPreferences localStorage = await SharedPreferences.getInstance();
var user = jsonDecode(localStorage.getString('user'));
if (user != null) {
setState(() {
name = user['name'];
phone = user['phone'];
adress = user['adress'];
email = user['email'];
});
}
}
在那之后，我尝试从 SharedPreferences 获取数据并将其显示在屏幕上:
After that , I tried to fetch data from SharedPreferences and display it on screen like that :
如您所见，用户可以修改他的姓名、地址...我的问题是当用户修改某些数据时 ==>直到他下次登录时才更新数据.我希望用户可以同时修改和更新新值(不需要离开页面).
as you see the user can modify his name , adress... My problem is when the user modify some data ==> the data not updated until he login next time . I want the user can modify and update the new value at the same time ( don't need leave page) .
这是我的代码;
Widget build(BuildContext context) {
Size size = MediaQuery.of(context).size;
return SafeArea(
/* minimum: const EdgeInsets.only(
top: 20.0, right: 5.0, left: 5.0, bottom: 10.0),*/
child: Center(
child: Scaffold(
resizeToAvoidBottomInset: true,
backgroundColor: Color(0xFFF6F7F8),
body: SingleChildScrollView(
child: Form(
key: _formKey,
child: FutureBuilder(
future: future,
// boxApi.getUser(),
//print(adress);
builder: (context, snapshot) {
// ignore: missing_return
// print(snapshot.data);
switch (snapshot.connectionState) {
case ConnectionState.none:
return Text('no connection');
case ConnectionState.active:
case ConnectionState.waiting:
return Center(
child: CircularProgressIndicator(),
);
break;
case ConnectionState.done:
if (snapshot.hasError) {
return Text('error');
} else if (snapshot.hasData) {
// String price = snapshot.data['body'].;
// print("${snapshot.data}");
return Column(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
children: [
Container(
padding: EdgeInsets.only(top: 16),
width: MediaQuery.of(context).size.width,
height:
MediaQuery.of(context).size.height / 4,
decoration: BoxDecoration(
boxShadow: [
BoxShadow(
color: Colors.white60,
blurRadius: 15.0,
offset: Offset(0.0, 0.75))
],
gradient: LinearGradient(
begin: Alignment(0.5, 0.85),
end: Alignment(0.48, -1.08),
colors: [
const Color(0xFF0B0C3A),
const Color(0xFF010611),
],
stops: [
0.0,
0.5,
],
),
//color: blue,
borderRadius: BorderRadius.only(
bottomRight: Radius.circular(32),
bottomLeft: Radius.circular(32))),
child: Column(
children: [
Row(
children: [
SizedBox(
width: 30,
),
Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text(
"$name",
style: TextStyle(
color: Colors.white,
fontSize: 25,
fontWeight:
FontWeight.bold),
),
SizedBox(
height: 10,
),
Text(
"$phone",
style: TextStyle(
color: Colors.white60,
fontSize: 18,
//fontWeight: FontWeight.w300
),
),
])
],
),
Row(
mainAxisAlignment:
MainAxisAlignment.end,
children: [
Container(
margin: EdgeInsets.symmetric(
vertical: 10),
width: size.width * 0.4,
child: ElevatedButton(
onPressed: () {
if (_nameController.text ==
"" &&
_emailController.text ==
"" &&
_adressController
.text ==
"") {
setState(() =>
isButtonDisabled =
true);
} else {
editUserProfile();
}
},
// editUserProfile();
child: Text('Enregistrer'),
style:
ElevatedButton.styleFrom(
primary: Colors.transparent,
shape:
RoundedRectangleBorder(
borderRadius:
BorderRadius
.circular(
20),
side: BorderSide(
color: Colors
.white)),
),
)),
SizedBox(
width: 20,
),
],
)
],
),
),
Container(
height: MediaQuery.of(context).size.height /
1.5,
// padding: EdgeInsets.only(
// top: 32,
// ),
child: Column(
mainAxisAlignment:
MainAxisAlignment.start,
children: [
Column(
mainAxisAlignment:
MainAxisAlignment.start,
children: [
Container(
width: size.width * 0.94,
child: Column(
mainAxisAlignment:
MainAxisAlignment.start,
children: [
Container(
padding: EdgeInsets.only(
left: 10,
right: 10,
bottom: 20,
top: 20),
child: Column(
mainAxisAlignment:
MainAxisAlignment
.start,
crossAxisAlignment:
CrossAxisAlignment
.start,
children: [
Row(
mainAxisAlignment:
MainAxisAlignment
.spaceBetween,
children: [
Text(
'Votre nom :',
style: TextStyle(
color: Color(
0xFF4053FCF),
fontSize: 16,
fontWeight:
FontWeight
.w600),
),
IconButton(
icon: Icon(
CommunityMaterialIcons
.pencil,
color: Colors
.grey,
),
onPressed: () {
myFocusNode
.requestFocus();
setState(() {
enableup =
true;
});
})
],
),
TextFormField(
controller:
_nameController,
enabled: enableup,
focusNode:
myFocusNode,
enableInteractiveSelection:
false,
keyboardType:
TextInputType
.text,
decoration: InputDecoration(
hintText: "$name",
hintStyle: TextStyle(
color: Colors
.grey,
fontSize:
14.0)),
),
推荐答案
我认为您需要重新加载 Sharedpreference 值.
I think you need to reload the Sharedpreference value.
SharedPreferences localStorage = await SharedPreferences.getInstance();
await localStorage.reload();
这篇关于每次抖动时如何更新 SharedPreferences 值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！