Instance Method

startMagnetometerUpdates(to:withHandler:)

Starts magnetometer updates on an operation queue and with a specified handler.

Declaration

func startMagnetometerUpdates(to queue: OperationQueue, withHandler handler: @escaping CMMagnetometerHandler)

Parameters

queue

An operation queue provided by the caller. Because the processed events might arrive at a high rate, using the main operation queue is not recommended.

handler

A block that is invoked with each update to handle new magnetometer data. The block must conform to the CMMagnetometerHandler type.

Discussion

You must call stopMagnetometerUpdates() when you no longer want your app to process magnetometer updates.

See Also

Managing Magnetometer Updates

var magnetometerUpdateInterval: TimeInterval

The interval, in seconds, at which the system delivers magnetometer data to the block handler.

func startMagnetometerUpdates()

Starts magnetometer updates without a block handler.

func stopMagnetometerUpdates()

Stops magnetometer updates.

var magnetometerData: CMMagnetometerData?

The latest sample of magnetometer data.

typealias CMMagnetometerHandler

The type of block callback for handling magnetometer data.