I am learning to write an app using the gyroscope sensor in iOS. Are there classes for dealing with the gyroscope similar to UIAcceleration/UIAccelerometer/UIAccelerometerDe
For gyroscope data, you'll need to use CoreMotion. Get started by reading the relevant section of the Event Handling Guide for iOS. You'll need to work with two classes: CMGyroData which encapsulates gyroscope event data, and CMMotionManager which is used to register for gyroscope events.
More information can be found in this question's selected answer: Apple gyroscope sample code