xMagneticNorthZVertical
A reference frame where the Z axis is vertical and the X axis points to the magnetic north pole.
Declaration
static var xMagneticNorthZVertical: CMAttitudeReferenceFrame { get }Mentioned in
Discussion
Use this option to determine the attitude of the device relative to magnetic north. For example, you might use this to implement a compass feature in your app. The yaw (Z-axis) value in CMAttitude is 0 when the X axis is aligned with magnetic north.
The device must have a magnetometer and that sensor must be available. If the magnetometer isn’t currently calibrated, Core Motion prompts the person to move the device to calibrate it.