Creating Leaflet layer that can be toggled in layer control from CartoDB viz.json?

How do I create a leaflet layer that can be toggled in the layer control from a cartodb viz.json? I have read that the cartodb.createlayer does not create a leaflet layer. It seems you can add the cartodb table, but of course that takes away the whole point of using cartodb for easy visualization. This seems like a basic function, I am a novice in terms of coding so maybe I am missing something.