Error when invoke requestWhenInUseAuthorization for location permissions - swift

Question

I'm trying to retrieve the user's location in the app using a location manager; as explained in Apple's documentation I created the following method:
func startReceivingLocationChanges() {
let authorizationStatus = CLLocationManager.authorizationStatus()
if authorizationStatus != .authorizedWhenInUse && authorizationStatus != .authorizedAlways {
locationManager.requestWhenInUseAuthorization()
startReceivingLocationChanges()
return
}
if !CLLocationManager.locationServicesEnabled() {
displayError(withTitle: "Location Not Available", withDescription: "Enable Location Services at Settings > Privacy > Location Services", sender: self)
return
}
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.distanceFilter = 100.0 // In meters.
locationManager.pausesLocationUpdatesAutomatically = true
locationManager.activityType = .other
locationManager.delegate = self
locationManager.startUpdatingLocation()
}
But When I launch the app, this crash showing the error "Thread 1: EXC_BAD_ACCESS (code=2, address=0x16f0a7f60)" near the line:
locationManager.requestWhenInUseAuthorization()
I specify that I added the relative "Privacy - Location Always and When In Use Usage Description" and "Privacy - Location When In Use Usage Description" keys inside the info.plist.
Does anyone know what causes the issue? Thanks.

Answer 1

There are couple of mistakes in your code like recursion in case user don’t give the permission for when in use so look at my code. Assuming you had added "Privacy - Location Always and When In Use Usage Description" and "Privacy - Location When In Use Usage Description" keys inside the info.plist. Below code works perfect without any issue and apple recommended.
import Foundation
import CoreLocation
typealias LocateMeCallback = (_ location: CLLocation?) -> Void
class LocationTracker: NSObject {
static let shared = LocationTracker()
var locationManager: CLLocationManager = {
let locationManager = CLLocationManager()
locationManager.activityType = .automotiveNavigation
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
locationManager.distanceFilter = 10
return locationManager
}()
var locateMeCallback: LocateMeCallback?
var currentLocation: CLLocation?
var isCurrentLocationAvailable: Bool {
return currentLocation != nil
}
func enableLocationServices() {
locationManager.delegate = self
switch CLLocationManager.authorizationStatus() {
case .notDetermined:
// Request when-in-use authorization initially
locationManager.requestWhenInUseAuthorization()
case .restricted, .denied:
// Disable location features
print("Fail permission to get current location of user")
case .authorizedWhenInUse:
// Enable basic location features
enableMyWhenInUseFeatures()
case .authorizedAlways:
// Enable any of your app's location features
enableMyAlwaysFeatures()
}
}
func enableMyWhenInUseFeatures() {
locationManager.startUpdatingLocation()
}
func enableMyAlwaysFeatures() {
locationManager.allowsBackgroundLocationUpdates = true
locationManager.pausesLocationUpdatesAutomatically = true
locationManager.startUpdatingLocation()
}
func locateMe(callback: #escaping LocateMeCallback) {
self.locateMeCallback = callback
enableLocationServices()
}
private override init() {}
}
// MARK: - CLLocationManagerDelegate
extension LocationTracker: CLLocationManagerDelegate {
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location = locations.first else { return }
print("locations = \(location.coordinate.latitude) \(location.coordinate.longitude)")
locateMeCallback?(location)
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print(error.localizedDescription)
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
enableLocationServices()
}
}
Usage
LocationTracker.shared.locateMe { location in
guard let location = location else {
print("Cann't retrieve current location of user")
return
}
// do what ever you want to do with location
}

Answer 2

Found the issue, it was related somehow to the recursive call to the function
startReceivingLocationChanges
inside the function itself. I solved it asking for location permissions inside ViewDidLoad method and removing the recursive call.