How to get a UITableView's visible sections?

Question

UITableView provides the methods indexPathsForVisibleRows and visibleCells, but how can I get the visible sections?

Answer 1

for (NSUInteger section = 0; section < self.tableView.numberOfSections; ++section) {
    UIView *headerView = [self.tableView headerViewForSection:section];
    if (headerView.window) {
        NSLog(@"its visible");
    }
}