Описание тега core-motion

Core Motion is a framework within Apple's iOS SDK used to access all kind of motion sensor data. Introduced in version 4.0 it is the recommended way of accessing gyroscope or accelerometer data, and since version 5.0 magnetometer (compass) data as well.

Citing from Event Handling Guide for iOS:

Core Motion is a system framework that obtains motion data from sensors on a device and presents that data to applications for processing. The handling of the sensor data and the application of related algorithms occurs on Core Motion’s own thread. The items of hardware that detect and originate these motion events are the accelerometer and the gyroscope. (The gyroscope is currently available only on iPhone 4.) Core Motion publishes an Objective-C programmatic interface that enables applications to receive device-motion data of various types, which they can then process in appropriate ways.

Core Motion is replacing the older UIAccelerometer framework wich is still available but deprecated in version 5.x.