public void registWithTarget (System.Object target, Action<CADisplayLink> selOnUpdate, Action<CADisplayLink> selOnGUI){ NSLooper looper = new NSLooper (); looper.target = target; looper.selOnUpdate = selOnUpdate; looper.selOnGUI = selOnGUI; _loopers.Add (looper); _looperCount ++; } public void invalidate(System.Object target){