Untitled

- (void)showLoaderWithMessage:(NSString *)msg {
   if (self.loadingView == nil) {
      MBProgressHUD *hud = [[MBProgressHUD alloc] initWithView:self.view];
      self.loadingView = hud;
      hud.labelText = msg;
      [hud show:YES];
    }
    [self.window addSubview:self.loadingView];
}

- (void)hideLoader {
    [self.loadingView removeFromSuperview];
}

- (void)fetchData {
   [self showLoader:@"Loading..."];
   // Make HTTP call using your prefered framework with delegate = self
   // ...
}

- (void)didFetchData {
   [self hideLoader];
   // Process results...
   [self.tableView reloadData];
}

- (void)didNotFetchData {
   [self hideLoader];
   // Show error
}