保存登录凭据Xcode [英] Saving login credentials Xcode

问题描述

我正在实现一个应用程序，第一个视图是登录视图。它包含3个文本字段帐户名，用户名和密码。我想让应用程序保存登录信息，以便每次打开应用程序时都不让用户写入。并在他/她退出时删除。

I am implementing an application, the first view is the login view. it contains 3 textfields Account name, Username and password. i want to let the application to save the login information in order not to let the user write them each time he/she opens the application. And to be deleted when he/she logs out.

怎么做？以及如何读取/写入文件？

how to do that? and how to read/write on a file?

谢天谢地

推荐答案

To Save:

    [[NSUserDefaults standardUserDefaults] setValue:AccountTxtField.text forKey:@"Account"];
    [[NSUserDefaults standardUserDefaults] setValue:UserTxtField.text forKey:@"Username"];
    [[NSUserDefaults standardUserDefaults] setValue:passwordTxtField.text forKey:@"password"];
    [[NSUserDefaults standardUserDefaults] synchronize];

To Read:

    NSString * _Account = [[NSUserDefaults standardUserDefaults] stringForKey:@"Account"];
    NSString * _UserName = [[NSUserDefaults standardUserDefaults] stringForKey:@"Username"];
    NSString * _password = [[NSUserDefaults standardUserDefaults] stringForKey:@"password"];

logOut：set all value is null。

logOut : set all value is null.

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