保持登录选项iPhone应用程序

Question

我需要在我的iPhone应用程序中实现“保持登录状态”或“记住我”复选框。我如何实现这一点？我如何存储用户ID？

帮助表示高度赞赏，

感谢， VKS

Answer 1

@VKS

• -(void)autologin:(id)sender 
  { 
      ischecked =!ischecked; 
      UIButton *check = (UIButton*)sender; 
      if(ischecked == NO) 
       [check setImage:[UIImage imageNamed:@"checkbox1.png"] forState:UIControlStateNormal]; 
      else 
       [check setImage:[UIImage imageNamed:@"checkbox-pressed.png"] forState:UIControlStateNormal]; 
  } 
  

• if(ischecked == YES) 
  { 
      NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults]; 
  
      [standardUserDefaults setObject:mainDelegate.uName forKey:@"username"]; 
      [standardUserDefaults setObject:mainDelegate.uPassword forKey:@"password"]; 
  
      [standardUserDefaults synchronize]; 
  } 
  

和用于检索密码/用户名

• if(isChecked == YES) 
  { 
      NSUserDefaults *standard = [NSUserDefaults standardUserDefaults]; 
      NSString *pass = [standard objectforkey:@"password"]; 
      NSString *user = [standard objectforkey:@"username"]; 
  } 
  if ([pass == nil] || [user == nil]) 
  { 
      // Show the alert view that user is not valid. 
  } 
  else 
  { 
      // User is valid. 
  } 
  

Answer 2

检查复选框是否被选中，如果选中，那么

  NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults]; 

     [standardUserDefaults setObject:mainDelegate.uName forKey:@"username"]; 
     [standardUserDefaults setObject:mainDelegate.uPassword forKey:@"password"]; 

     [standardUserDefaults synchronize]; 

这将节省您的变量，而登录检查所保存NSUserDefaults的。

 if (standardUserDefaults) { 

     //Here check for the values if there are any values then use the same and login 
     } 

检查谷歌上的任何NSUserDefaults教程，您将获得示例代码。

Answer 3

由于NSUserDefaults不安全，我建议使用iOS keychain持久保存密码。

看这里：http://iosdevelopertips.com/core-services/using-keychain-to-store-username-and-password.html