无论如何要在flutter中使用sharedPreferences启用“记住我"功能? [英] Anyway to enable 'remember me' function using sharedPreferences in flutter?

问题描述

当前，如果用户成功登录一次，我将启用保持登录"功能.但是，我仍然要选中记住我"复选框，以为用户保存成功登录信息.谁能帮我这个忙吗?

Currently, I have enabled 'keep logging in' function if the user log in once successfully. However, I still want to make a 'remember me' checkbox to save the success login information for user. Can anyone please help me with this?

需要:一个复选框，如果用户成功登录一次，该复选框使用户能够存储电子邮件和密码.

Need: a checkbox that enables the user to store email and password if the user logged in once successfully.

代码如下所示:

  signIn(String email, pass) async {
    SharedPreferences sharedPreferences = await SharedPreferences.getInstance();
    String url = ServerDetails.ip +
        ':' +
        ServerDetails.port +
        ServerDetails.api +
        'login';
    Map<String, String> headers = {"Content-type": "application/json"};
    var data = jsonEncode({
      'email': email,
      'password': pass,
      'token': FirebaseNotifications.fcmtoken
    });
    var jsonResponse = null;
    var response = await http.post(url, headers: headers, body: data);

    if (response.statusCode == 200) {
      jsonResponse = json.decode(response.body);
      if (jsonResponse != null) {
        setState(() {
          _isLoading = false;
        });
        sharedPreferences.setString("token", jsonResponse['token']);
        sharedPreferences.setString(
            "token_expire_date", jsonResponse['token_expire_date']);
        Navigator.of(context).pushAndRemoveUntil(
            MaterialPageRoute(builder: (BuildContext context) => MainPage()),
            (Route<dynamic> route) => false);
      }
    } else {
      setState(() {
        _isLoading = false;
      });
      Widget okButton = FlatButton(
          child: Text("OK"),
          onPressed: () {
            Navigator.push(
                context, MaterialPageRoute(builder: (context) => MainPage()));
          });
      setState(() {
        AlertDialog alert = AlertDialog(
          title: Text("Error message"),
          content: Text("Oops! The password is wrong or the email is invalid."),
          actions: [
            okButton,
          ],
        );
        showDialog(
          context: context,
          builder: (BuildContext context) {
            return alert;
          },
        );
      });
      print(response.headers);
      print(response.body);
    }
  }

推荐答案

当然，您可以为记住我创建一个简单的复选框.在登录按钮中，您可以检查是否选中了此复选框.如果是这样，您可以设置电子邮件&共享首选项中的密码.

Of course, you can create a simple checkbox for remember me. In the login button, you can check if this checkbox is checked. If it is, you can set email & password in shared_preferences.

下次，当用户再次出现时，您可以从shared_preferences自动获得这些字段.

Next time, when the user comes again you can get these fields automatically from shared_preferences.

此处是一个例子.

这篇关于无论如何要在flutter中使用sharedPreferences启用“记住我"功能?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IT屋！