The dequeueReusableHeaderFooterView method in Objective-C is used to efficiently reuse header and footer views in a table view or collection view. It returns a reusable header or footer view object, or creates a new one if none is available for reuse.

Here is an example of how to use dequeueReusableHeaderFooterView in Objective-C:

- (UIView )tableView:(UITableView )tableView viewForHeaderInSection:(NSInteger)section {
    // Try to dequeue a reusable header view
    UITableViewHeaderFooterView *headerView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:@"HeaderViewIdentifier"];

    // If no reusable header view is available, create a new one
    if (headerView == nil) {
        headerView = [[UITableViewHeaderFooterView alloc] initWithReuseIdentifier:@"HeaderViewIdentifier"];

    // Configure the header view
    // ...

    return headerView;

In this example, the dequeueReusableHeaderFooterViewWithIdentifier: method is called on the tableView object to dequeue a reusable header view with the specified identifier. If no reusable header view is available, a new one is created using the initWithReuseIdentifier: method. Finally, the header view is configured and returned.

Please note that the actual implementation may vary depending on your specific use case and requirements.

I hope this helps! Let me know if you have any further questions.