Implementing "Swipe" in Unreal Engine for IOS.

I’m currently making a game for IOS devices, and i’ve got to make the camera move. Basically i’ve set up a simple system with two button when i click on the right button it moves me 90 degrees,but i want it more complicated.
I want to have the camera move every time i swipe the screen, if i swipe it left i want the camera to move left and the longer the swipe the further i want the camera to move. But i really have no idea where to start at.
The pre-defined swipe left to right action under action mappings(i believe) doesn’t work .