LocationTracker

Tracker.swift

//
//  Tracker.swift
//  LocationTracker
//
//  Created by Chris Hipgrave on 25/02/2021.
//

import CoreLocation

class Tracker : NSObject, CLLocationManagerDelegate {
    
    static let shared = Tracker()
    
    var locationManager: CLLocationManager?
    
    var updateLabel: (() -> Void)?
    var heading: Double = 0 {
        didSet {
            updateLabel?()
        }
    }
    
    override init() {
        super.init()
        self.locationManager = CLLocationManager()
        self.locationManager?.delegate = self
        self.locationManager?.headingFilter = 0.1
        self.locationManager?.requestAlwaysAuthorization()
    }
    
    func startTracking() {
        locationManager?.startUpdatingHeading()
    }
    
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        if status == .authorizedAlways || status == .authorizedWhenInUse {
            if CLLocationManager.headingAvailable() {
                self.startTracking()
            }
        }
    }
    
    func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) {
        self.heading = newHeading.trueHeading
        print(newHeading.trueHeading)
    }

}

ViewController.swift

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var label: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        Tracker.shared.startTracking()
        Tracker.shared.updateLabel = updateLabel
    }
    
    func updateLabel(){
        label.text = String(describing: Tracker.shared.heading)
    }

}