CoreMotion Namespace

The CoreMotion namespace provides access to motion data, including device acceleration and orientation, altitude, compass, and pedometer.

Classes

CMAccelerometerData	An accelerometer event, encapsulates an instance of CMAcceleration
CMAltimeter	Interface to the relative-altitude pressure sensor.
CMAltitudeData	Holds relative-altitude data, generated by the CMAltitudeData class.
CMAttitude	Used to pull spacial information from the device in either quaternion, rotation matrix or with 3D angles (roll, pitch and yaw).
CMDeviceMotion	Encapsulates Attitude, Rotation Rate and Acceleration of the device.
CMDyskineticSymptomResult
CMGyroData	A single measurement of the device rotation rate.
CMLogItem	Base class for CMAccelerometerData, CMDeviceMotion and CMGyroData, it is used to attach a timestamp to these events.
CMMagnetometerData	A reading from the device magnetometer.
CMMotionActivity	A motion update event, including characterization of the likely form (walking, running, automotive).
CMMotionActivityManager	On supported devices, accesses stored motion data and allows monitoring of motion updates.
CMMotionManager	Core class that provides access to the motion services in iOS.
CMPedometer	Generates step-counting data, including number of steps and floors climbed/descended.
CMPedometerData	Holds data relating to walking and floor-climbing. Generated by CMPedometer.
CMPedometerEvent
CMRecordedAccelerometerData	Accelerometer data stored by a CMSensorRecorder.
CMSensorDataList	A system-provided list of objects that contain recorded Core Motion accelerometer data.
CMSensorRecorder	Gathers and retrieves accelerometer data.
CMStepCounter	On supported devices, stores the number of steps the user has taken with the device and allows step-counting to be dynamically tracked.
CMTremorResult

Structs

CMAcceleration	A 3D vector containing acceleration values.
CMCalibratedMagneticField	Encapsulates the accuracy and field strength of the magnetometer after calibration.
CMMagneticField	Represents the 3-axis magnetometer data in microteslas.
CMQuaternion	Represents a Quaternion, used as one of the possible CMAttitude representations.
CMRotationMatrix	Represents a 3x3 rotation matrix.
CMRotationRate	3D rotation rate.

Enums

CMAttitudeReferenceFrame	An enumeration whose values specify the reference frame from which CMAttitude readings are referenced.
CMAuthorizationStatus
CMError	Type for CoreMotion errors.
CMMagneticFieldCalibrationAccuracy	An enumeration whose values specify the quality of the magnetometer calibration.
CMMotionActivityConfidence	An enumeration whose values specify the confidence in a CMMotionActivity.
CMPedometerEventType

Delegates

CMAccelerometerHandler	A delegate signature used to receive events from CMMotionManager
CMDeviceMotionHandler	A delegate signature used to receive events from CMMotionManager
CMGyroHandler	A delegate signature used to receive events from CMMotionManager
CMMagnetometerHandler	A delegate that is the handler for the StartMagnetometerUpdates(NSOperationQueue, CMMagnetometerHandler) method.
CMMotionActivityHandler	The delegate that acts as the handler for QueryActivity(NSDate, NSDate, NSOperationQueue, CMMotionActivityQueryHandler).
CMMotionActivityQueryHandler	The delegate that is the handler for StartActivityUpdates(NSOperationQueue, CMMotionActivityHandler).
CMStepQueryHandler	The delegate for use with QueryStepCount(NSDate, NSDate, NSOperationQueue, CMStepQueryHandler).
CMStepUpdateHandler	The delegate used with StartStepCountingUpdates(NSOperationQueue, nint, CMStepUpdateHandler).

Remarks

The CoreMotion API allows developers to get hardware events from the built-in accelerometer and gyroscopes.