 public class ReadingListHintController: NSObject, ReadingListHintViewControllerDelegate {
 
     private let dataStore: MWKDataStore
-    private let presenter: UIViewController
+    private weak var presenter: UIViewController?
     private let hint: ReadingListHintViewController
     private let hintHeight: CGFloat = 50
     private var theme: Theme = Theme.standard

    }
    
    private lazy var hintFrame: (visible: CGRect, hidden: CGRect) = {
        let visible = CGRect(x: 0, y: presenter.view.bounds.height - hintHeight - presenter.bottomLayoutGuide.length, width: presenter.view.bounds.size.width, height: hintHeight)
        let hidden = CGRect(x: 0, y: presenter.view.bounds.height + hintHeight - presenter.bottomLayoutGuide.length, width: presenter.view.bounds.size.width, height: hintHeight)
        return (visible: visible, hidden: hidden)

    
    func addHint() {
        hint.apply(theme: theme)
        presenter?.addChildViewController(hint)
        hint.view.autoresizingMask = [.flexibleTopMargin, .flexibleWidth]
        presenter?.view.addSubview(hint.view)
        hint.didMove(toParentViewController: presenter)
    }
    
