uitableview - Reduce space between header and table view cell in swift

Question

I have table view with custom header and a cell with single section. I want to reduce the space between the header and the 1st cell. I have used heightforrow method as follows:

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        if tableView == tableview1
        {
            return 1
        }
        else
        {
            return 0
        }
    }

This did not have any effect on the spacing. The height of the header is 774.The cell starts from 798 and it is grayed out as shown in the image.

How to reduce the space of it which is shown below.

Answer 1

Try using Float.leastNonzeroMagnitude instead of zero

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    if tableView == tableview1
    {
        return CGFloat(Float.leastNonzeroMagnitude)
    }
    else
    {
        return 0
    }
}