UITableView is being reset when I use Custom Class

I have a UITableView with 2 text field and a button. If I run the simulator without use custom class, I can see the text fields and button:

But when i use a custom class, my UITable view only display a lot of lines without content:

Here is how I've created my properties:

LoginSceneController.h

#import <UIKit/UIKit.h>

@interface LoginSceneController : UITableViewController

@property (nonatomic, strong) IBOutlet UITextField *email;

@property (nonatomic, strong) IBOutlet UITextField *password;

- (IBAction)doLogin;

@end

LoginSceneController.m

#import "LoginSceneController.h"

@interface LoginSceneController ()

@end

@implementation LoginSceneController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)doLogin {

    NSURL *url = [NSURL URLWithString:@"http://rest-service.guides.spring.io/greeting"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [NSURLConnection sendAsynchronousRequest:request
                                       queue:[NSOperationQueue mainQueue]
                           completionHandler:^(NSURLResponse *response,
                                               NSData *data, NSError *connectionError)
     {
         if (data.length > 0 && connectionError == nil)
         {
             NSDictionary *greeting = [NSJSONSerialization JSONObjectWithData:data
                                                                      options:0
                                                                        error:NULL];
             self.email.text = [[greeting objectForKey:@"id"] stringValue];
             self.password.text = [greeting objectForKey:@"content"];
         }
     }];
}
@end

The problem happens when I use a custom class (or referencing outlet or add a send event on button).

What is wrong?

edit: I think that I need populate my interface using my custom class because the static content is being lost. Is it possible to be the cause of content being lost?