             backgroundView.style = backgroundStyle
         }
     }
-    /// Color of the separator at the bottom of the navigation bar.
+    /// Color of the separator at the bottom of the system bar.
     ///
     /// Defaults to `UIColor.white.withAlphaComponent(0.5)`.
     public var separatorColor: UIColor = UIColor.white.withAlphaComponent(0.5) {

            return
        }
        guard let viewController = nextViewControllerInResponderChain() else {
            fatalError("TMNavigationBar could not find view controller to use for layout guides.")
        }
        hasExtendedEdges = true
        viewController.view.layoutIfNeeded()

    // MARK: Init
    
    public required init?(coder aDecoder: NSCoder) {
        fatalError("Use init(for:viewController:)")
    }
    
    /// Create a system bar.
    ///
    /// - Parameter bar: Bar to embed in the system bar.
    public required init(for bar: TMBar) {
        self.bar = bar
        super.init(frame: .zero)
