Setting tableHeaderView height dynamically

Question

My application creates a UITableViewController that contains a custom tableHeaderView which may have an arbitrary height. I\'ve been struggling with a way to set this header

Answer 1

Determining the header's frame size using

header.systemLayoutSizeFitting(UILayoutFittingCompressedSize)

as suggested in the answers above didn't work for me when my header view consisted of a single multiline label. With the label's line break mode set to wrap, the text just gets cut off:

Instead, what did work for me was using the width of the table view and a height of 0 as the target size:

header.systemLayoutSizeFitting(CGSize(width: tableView.bounds.width, height: 0))

Putting it all together (I prefer to use an extension):

extension UITableView {
    func updateHeaderViewHeight() {
        if let header = self.tableHeaderView {
            let newSize = header.systemLayoutSizeFitting(CGSize(width: self.bounds.width, height: 0))
            header.frame.size.height = newSize.height
        }
    }
}

And call it like so:

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    tableView.updateHeaderViewHeight()
}