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CMMagnetometerHandler

The type of block callback for handling magnetometer data.

Declaration

typealias CMMagnetometerHandler = (CMMagnetometerData?, (any Error)?) -> Void

Discussion

Blocks of type CMMagnetometerHandler are called when there is magnetometer data to process. You pass the block into the startMagnetometerUpdates(to:withHandler:) method as the second argument. Blocks of this type return no value but take two arguments:

magnetometerData

An object that encapsulates a CMMagneticField structure with fields holding magnetic-field values for the three axes of movement.

error

An error object representing an error encountered in providing magnetometer data. If an error occurs, you should stop magnetometer updates and inform the user of the problem. If there is no error, this argument is nil. Core Motion errors are of the CMErrorDomain domain and the CMError type.

See Also

Managing Magnetometer Updates