ios - 在每个 View Controller 中显示用户名 jsondata

Question

1. 我目前正在使用 Objective-C 开发 IOS 应用程序。我遇到的问题是，我需要在每个 View Controller 中显示 jsondata 中的用户名。 (就像facebook一样，当您登录时，您的全名/用户名将显示在上面)

2. 我正在使用 Github 中的 sbjson v3.1.1 框架在我的应用程序中执行用户身份验证。如何从 jsondata 调用用户名数据？ (我的 jsondata 数组中有 1、userid、密码和用户名)

3.这是我的身份验证代码。

@try {

    if([[txtLogin text] isEqualToString:@""] || [[txtPassword text] isEqualToString:@""] ) {
        [self alertStatus:@"Please enter both Username and Password" :@"Login Failed!"];
    } else {
        NSString *post =[[NSString alloc] initWithFormat:@"userid=%@&pass=%@",[txtLogin text],[txtPassword text]];
        NSLog(@"PostData: %@",post);

        NSURL *url=[NSURL URLWithString:@"http://192.168.1.14:8888/itrack/mobile/login.php?"];

        NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

        NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

        NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
        [request setURL:url];
        [request setHTTPMethod:@"POST"];
        [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
        [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
        [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
        [request setHTTPBody:postData];

        //[NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[url host]];

        NSError *error = [[NSError alloc] init];
        NSHTTPURLResponse *response = nil;
        NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

        NSLog(@"Response code: %d", [response statusCode]);
        if ([response statusCode] >=200 && [response statusCode] <300)
        {
            NSString *responseData = [[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
            NSLog(@"Response ==> %@", responseData);

            SBJsonParser *jsonParser = [SBJsonParser new];
            NSDictionary *jsonData = (NSDictionary *) [jsonParser objectWithString:responseData error:nil];
            NSLog(@"%@",jsonData);
            NSInteger success = [(NSNumber *) [jsonData objectForKey:@"login"] integerValue];
            NSLog(@"%d",success);

          //  NSString *test = (NSString *) [jsonData objectForKey:@"username"];


            if(success == 1)
            {
                NSLog(@"Login SUCCESS");
                [self alertStatus:@"Logged in Successfully." :@"Login Success!"];

                homepageVC *controller = [self.storyboard   instantiateViewControllerWithIdentifier:@"homeEN"];
                [self presentViewController:controller animated:YES completion:nil];

                //redirect to homepage
               // UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"main" bundle:nil];
                //UIViewController *newView = [mainStoryboard instantiateViewControllerWithIdentifier:@"login"];
                //[self presentViewController:newView animated:YES completion:nil];


            } else {

                NSString *error_msg = (NSString *) [jsonData objectForKey:@"err"];
                [self alertStatus:error_msg :@"Login Failed!"];
            }

        } else {
            if (error) NSLog(@"Error: %@", error);
            [self alertStatus:@"Connection Failed" :@"Login Failed!"];
        }
    }
}
@catch (NSException * e) {
    NSLog(@"Exception: %@", e);
    [self alertStatus:@"Login Failed." :@"Login Failed!"];
}
}

Answer 1

其中一种方法是将用户名存储在 NSUserDefaults 中，然后在每个其他 View Controller 中检索。这样，如果用户名 key 不为零，那么您就知道该用户确实进行了身份验证。

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:"TheName" forKey:@"username"];
// you can store any other properties if neeeded
[defaults synchronize]; // to save the data into NSUserDefaults

要在任何其他 View Controller 中检索用户名，即使应用已重新启动也是如此

 NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
 NSString *userName = [defaults objectForKey:@"userName"];

让我知道这是否适用于您的情况。