iOS geolocation, Code works differently when initialization and declaration happen together - ios

Question

In iOS geolocation, the code works if the locationManager is declared and initialized separately, however it does not work if it is declared and initialized at the same time. Why is it so? The following is the working code sample:-
var locationManager : CLLocationManager!
func initLocManager() {
locationManager=CLLocationManager()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.activityType = .automotiveNavigation
locationManager.distanceFilter = 10.0
}
func retrieveLocation(){
initLocManager()
locationManager.requestAlwaysAuthorization()
locationManager.startUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
for location in locations {
print("Long \(location.coordinate.longitude)")
print("Lati \(location.coordinate.latitude)")
}
}
whereas the following code does not work:-
var locationManager = CLLocationManager()
func initLocManager() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.activityType = .automotiveNavigation
locationManager.distanceFilter = 10.0
}
func retrieveLocation(){
initLocManager()
locationManager.requestAlwaysAuthorization()
locationManager.startUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
for location in locations {
print("Long \(location.coordinate.longitude)")
print("Lati \(location.coordinate.latitude)")
}
}

Answer 1

Another way:
Create new file with this code:
import UIKit
import CoreLocation
class LocationManager: CLLocationManager, CLLocationManagerDelegate {
static let shared = LocationManager()
public var currentLocation = CLLocation() {
didSet {
NotificationCenter.default.post(name: NSNotification.Name(rawValue: LocationManager.LocationUpdatedNotification), object: self, userInfo: nil)
}
}
static let LocationUpdatedNotification: String = "LocationUpdate"
private override init() {
super.init()
self.delegate = self
self.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
self.activityType = .automotiveNavigation
self.distanceFilter = 10.0
self.requestAlwaysAuthorization()
self.startUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let lastLocation = locations.last {
currentLocation = lastLocation
}
}
}
In AppDelegate.swift
_ = LocationManager.shared // Add this line to func didFinishLaunchingWithOptions
Now you can get current user location using this code:
LocationManager.shared.currentLocation
Also you can subscribe for LocationUpdate notification anywhere in your project.