after removing the tableheader from a UITableView, there is a gap left

Question

I have a UITableView with a filter button. If the button is pressed, it may happen, that the table is empty. To inform the user, I am adding a tableheader view in that case. If there are rows to show, I set the header back to nil.

Update: I am not talking about section header, I am talking about the table header.

Everything works as expected, but if the tableheader is removed, I see a gap over the table, that hasn't been there before. Any idea how to get rid if it?

This is the code:

if( _sections.count == 0 ) {
    UIView *tableHeader = [self getTableHeader]; // make a view
    self.tableView.tableHeaderView = tableHeader;
}
else {
    self.tableView.tableHeaderView = nil;
    [self.tableView reloadData]; // I added this as a test - no luck
}

This is how it looks before filtering everything away:

This is the "empty" case:

This is, if I remove the filter again:

Answer 1

have you tried setting the header height to 0.0f when section != 0 in: - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section

Edit:
I think the solution that you're looking for is replacing self.tableView.tableHeaderView = nil; with: self.tableView.tableHeaderView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, self.tableView.bounds.size.width, 0.01f)]; found in Why is there extra padding at the top of my UITableView with style UITableViewStyleGrouped in iOS7 by Mr. T