No location permission pop up for locationManager.requestWhenInUseAuthorization() - swift

Question

I'm following an online tutorial to make a simple project that displays a user's location on the map. However, when I run it, the user location is not displayed and there is no pop up to ask for location permission. I'm not sure how I can fix that. I've attached the code below.
import MapKit
import SwiftUI
struct ContentView: View {
#StateObject private var viewModel=ContentViewModel()
var body: some View {
Map(coordinateRegion: $viewModel.region)
.ignoresSafeArea()
.onAppear{viewModel.checkIfLocationServicesIsEnabled()}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
final class ContentViewModel: NSObject, ObservableObject, CLLocationManagerDelegate{
#Published var region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude:37.3331516, longitude: -121.891054), span: MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1));
var locationManager: CLLocationManager?
func checkIfLocationServicesIsEnabled(){
if CLLocationManager.locationServicesEnabled(){
locationManager=CLLocationManager()
locationManager!.delegate=self
}
else{
print("Turn location on")
}
}
private func checkLocationAuthorization(){
guard let locationManager = locationManager else {
return
}
switch locationManager.authorizationStatus{
case.notDetermined:
locationManager.requestWhenInUseAuthorization()
case .restricted:
print("Your location is restricted likely due to parental controls.")
case .denied:
print("You have denied this app location permission. Go into settings to change it.")
case .authorizedAlways:
region=MKCoordinateRegion(center: locationManager.location!.coordinate, span:MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1))
case .authorizedWhenInUse:
region=MKCoordinateRegion(center: locationManager.location!.coordinate, span:MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1))
#unknown default:
break
}
func locationManagerDidChangeAuthorization(_manager: CLLocationManager) {
checkLocationAuthorization()
}
}
}

Answer 1

Your code has 2 issues
You are not asking for permissions.
You implemented the delegate wrong.
This should work:
final class ContentViewModel: NSObject, ObservableObject, CLLocationManagerDelegate{
#Published var region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude:37.3331516, longitude: -121.891054), span: MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1));
var locationManager: CLLocationManager?
func checkIfLocationServicesIsEnabled(){
if CLLocationManager.locationServicesEnabled(){
locationManager=CLLocationManager()
locationManager?.delegate=self
//ask for permissions here
//depending on your usage you could also ask for
//locationManager?.requestWhenInUseAuthorization()
locationManager?.requestAlwaysAuthorization()
}
else{
print("Turn location on")
}
}
private func checkLocationAuthorization(){
guard let locationManager = locationManager else {
return
}
switch locationManager.authorizationStatus{
case.notDetermined:
//the function containing this will only be called if the permission get requested so remove it
//locationManager.requestWhenInUseAuthorization()
case .restricted:
print("Your location is restricted likely due to parental controls.")
case .denied:
print("You have denied this app location permission. Go into settings to change it.")
case .authorizedAlways:
region=MKCoordinateRegion(center: locationManager.location!.coordinate, span:MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1))
case .authorizedWhenInUse:
region=MKCoordinateRegion(center: locationManager.location!.coordinate, span:MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1))
#unknown default:
break
}
}
// this function was wrapped inside your checkLocationAuthorization() function
//move it to outer scope. It gets called every time you request permissions
func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
checkLocationAuthorization()
}
}
Be aware you will have to add multiple privacy keys to get this working.