gistfile1.m

//NSString *string = [NSString stringWithFormat:@"%@weather.php?format=json", BaseURLString];
        NSString *string = [NSString stringWithFormat:@"%@sessions", BaseURLString];
        NSURL *url = [NSURL URLWithString:string];
        NSURLRequest *request = [NSURLRequest requestWithURL:url];
        
        // 2
        NSDictionary *params = @{@"email": email,
                                 @"password": password};
        
        AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
        operation.responseSerializer = [AFJSONResponseSerializer serializer];
        
        [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
            
            // 3
            //self.weather = (NSDictionary *)responseObject;
            //self.title = @"JSON Retrieved";
            //[self.tableView reloadData];
            
            NSLog(@"%@", responseObject);
            //[self popViewControllerAnimated:YES];
            [self.navigationController popViewControllerAnimated:YES];
            
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            
            // 4
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Weather"
                                                                message:[error localizedDescription]
                                                               delegate:nil
                                                      cancelButtonTitle:@"Ok"
                                                      otherButtonTitles:nil];
            [alertView show];
        }];
        
        // 5
        [operation start];