     
     var items = [String]()
     
-    var isShown = false
-    
     // configuration
     var animationDuration: NSTimeInterval = 0.5
     var maskBackgroundColor: UIColor = .blackColor()

    }
    
    func toggleMenu() {
        isShown = !isShown
        if isShown {
            showMenu()
        } else {
            hideMenu()

    }
    
}
