I was playing with a simple iOS toggle and the new color class. It takes away quite a bit of the complexity of prototyping this control (which is super detailed and a nice exercise to get right). Thanks Andrew for the initial toggle prototype, you shared a while ago. Here are the .framer files → http://share.framerjs.com/70nki138zrt9/
PS: The file turned out a bit more dynamic then I intended it to be. You can set the toggleSize (#3) and everything grows / shrinks along nicely.