CMHeadphoneMotionManager.DeviceMotionHandler
The type of block callback for handling headphone-motion data.
Declaration
typealias DeviceMotionHandler = (CMDeviceMotion?, (any Error)?) -> VoidDiscussion
The system calls CMDeviceMotionHandler blocks 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:
motionA CMHeadphoneMotionManager object, which encapsulates other objects and a structure representing attitude, rotation rate, gravity, and user acceleration.
errorAn error object representing an error when providing gyroscope data. If an error occurs, you should stop gyroscope 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.