Height for tableView.headerView(forSection: 0) is nil

Question

I'm trying to change the height of the header view as the user scrolls following this tutorial . However, when I try to access self.songsTable.headerView(forSection: 0)?.frame.size.height (so I can update the height of the header view), the value is nil and the debugger tells me "header view has no height". I created my header view programmatically using heightForHeaderInSection and viewForHeaderInSection .

Code

class SongsViewController {
var currentHeaderHeight: CGFloat = 136

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        //Throws error
        guard let currentHeaderHeight = self.songsTable.headerView(forSection: 0)?.frame.size.height else {
            print("header view has no height")
            return
        }
    }

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

    public func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let headerView = UIView()
        headerView.frame = CGRect(x: 0, y: 0, width: Screen.width, height: maxHeaderHeight)
        return headerView
    }
}

Answer 1

This may just be missing in your code snippet, but have you set up your viewController as the TableViewDataSource?

class SongsViewController: UIViewController, UITableViewDataSource {

    override func viewDidLoad() {
        super.viewDidLoad()
        songsTable.dataSource = self
    }

    // ... the rest of your code ...
}