每次抖动时如何更新 SharedPreferences 值

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();