 //MARK: Public Methods
 public extension SAInboxViewController {
     public func setHeaderViewHidden(hidden: Bool, animated: Bool) {
-        headerViewHeightConstraint?.constant = hidden ? 0 : SAInboxViewController.kHeaderViewHeight
+        headerViewHeightConstraint?.constant = hidden ? 0 : SAInboxViewController.HeaderViewHeight
         if animated {
             UIView.animateWithDuration(0.25) {
                 self.view.layoutIfNeeded()

    
    //MARK: - Staitc properties
    public static let appearance = Appearance()
    private static let kHeaderViewHeight: CGFloat = 64
    
    //MARK: - Instance properties
    public let headerView = HeaderView()

                headerView.setTitle(title)
            }
        }
    }
    private var scrollPosition: CGPoint = CGPointZero
    private var headerViewHeightConstraint: NSLayoutConstraint?
    public var enabledViewControllerBasedAppearance :Bool = false
    public let appearance = Appearance()
