How to change height of grouped UITableView header?

Question

I know how to change the height of the section headers in the table view. But I am unable to find any solution to change the default spacing before the first section.

Answer 1

In Swift 4

Remove extra top padding in grouped tableview.

Here height is given 1 as minimal height for the section header because you cannot give 0 as tableview will take it default top margin if assigned zero height.

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    return 1
}

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    return UIView()
}