             var constraints = NSLayoutConstraint.constraintsWithVisualFormat("V:[view(\(itemHeight))]", options: nil, metrics: nil, views: viewDict)
             view.addConstraints(constraints)
             
-            if let previous = previousView?
+            if let previous = previousView
             {
                 let leftConstraint = NSLayoutConstraint(item:view,
                     attribute:NSLayoutAttribute.Left,

            self.addConstraint(topConstraint)
            previousView = view
        }
        if let previous = previousView?
        {
            let leftConstraint = NSLayoutConstraint(item:previous,
                attribute:NSLayoutAttribute.Right,

        self.addGestureRecognizer(tapGestureRecogniser)
    }
    
    init() {
        super.init(frame: CGRectZero)
        self.initComponents()
    }
    
