Is it possible to track touch inputs without a view?

Background:
I wan't to track how far the user have scrolled up/down in a listView. Sadly the position of the scrollbar is not exposed so I got an idea that I possible could track the coordinate of the touch on the screen and where it releases and calculate the distance. All my views is written in Portable Library so the best would be If I could write some helpermethod in iOS-library that I could request the touch-location in from the Portable library. Any help is welcome!