     private let kMaxHeight:CGFloat = 200
     private let kCellWidth:CGFloat = 50
     private let kFooterHeight:CGFloat = 70
-    private let kAnimationDuration:TimeInterval = 0.3
+    private let kAnimationDuration:TimeInterval = 6
     
     init(controller:CChat)
     {

            "collectionView":collectionView]
        
        let metrics:[String:CGFloat] = [
            "borderHeight":kBorderHeight]
        
        addConstraints(NSLayoutConstraint.constraints(
            withVisualFormat:"H:|-0-[border]-0-|",

            metrics:metrics,
            views:views))
        addConstraints(NSLayoutConstraint.constraints(
            withVisualFormat:"V:|-0-[collectionView(collectionHeight)]",
            options:[],
            metrics:metrics,
            views:views))
