MotionManagerViewDidLoad.swift

/// This is how often we will get device motion updates
/// 0.03 is more than often enough and is about the rate that the video frame changes!
motionManager.deviceMotionUpdateInterval = 0.03

motionManager.startDeviceMotionUpdates(to: .main) {
    [weak self] (data, error) in
    guard let data = data, error == nil else {
        return
    }

    /// This function will be called every 0.03 seconds
    self?.updateHighlightOrientations(attitude: data.attitude)
}