tableHeaderAutoHeight.swift

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
 
    // Dynamic sizing for the header view
    if let headerView = tableView.tableHeaderView {
        let height = headerView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize).height
        var headerFrame = headerView.frame
 
        // If we don't have this check, viewDidLayoutSubviews() will get
        // repeatedly, causing the app to hang.
        if height != headerFrame.size.height {
            headerFrame.size.height = height
            headerView.frame = headerFrame
            tableView.tableHeaderView = headerView
        }
    }
}