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CMDeviceMotionHandler

The type of block callback for handling device-motion data.

Declaration

typealias CMDeviceMotionHandler = (CMDeviceMotion?, (any Error)?) -> Void

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Discussion

Blocks of type CMDeviceMotionHandler are called when there is device-motion data to process. You pass the block into startDeviceMotionUpdates(to:withHandler:) as the second argument. Blocks of this type return no value but take two arguments:

motion

A CMDeviceMotion object, which encapsulates other objects and a structure representing attitude, rotation rate, gravity, and user acceleration.

error

An error object representing an error encountered in providing device-motion data. If an error occurs, you should stop device-motion data 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 Device Motion Updates