How to enable swipe to delete on custom UITableViewCell Objective-C

Question

I need to add the "swipe to delete" feature on my UITableView, I tried with the following code:

- (UITableViewCellEditingStyle)tableView:(UITableView *)aTableView
           editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
    return UITableViewCellEditingStyleDelete;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [indexProdotti removeObjectAtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    } else {
        NSLog(@"Unhandled editing style! %ld", (long)editingStyle);
    }
}

The problem is that there is only a limited space I have to swipe in order to show the delete button, the rest of the cell if swiped gives no result.. Am I missing something in my implementation?