This is an abstract class for doing motion effects on your application. When subclassing, you must at least implement the UIMotionEffect.ComputeKeyPathsAndRelativeValues method which returns a dictionary of changes that contain a list of keypaths along with the new value that will be applied to the view that this effect is attached to.

In general, you will want to use the UIKit.UIInterpolatingMotionEffect class which provides a way of interpolating the device tilt values to a linear value.

This class maps the hardware tilt into the range -1 to 1.