How to show location on map view on swift? I believe my code is current but simulator doesn't show location or the blue dot? - ios

Question

I am trying to show on my current location and a blue dot on the map using the map view on swift. However it does not show my location nor the blue dot I'm very positive of my code but I can't get it to show! it's probably an issue with the settings?
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController {
#IBOutlet weak var mapView: MKMapView!
let locationManager = CLLocationManager()
let regionInMeters: Double = 1000
override func viewDidLoad() {
super.viewDidLoad()
checkLocationServices()
}
func setupLocationManager() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
}
func centerViewOnUserLocation() {
if let location = locationManager.location?.coordinate {
let region = MKCoordinateRegion.init(center: location, latitudinalMeters: regionInMeters, longitudinalMeters: regionInMeters)
mapView.setRegion(region, animated: true)
}
}
func checkLocationServices() {
if CLLocationManager.locationServicesEnabled() {
setupLocationManager()
checkLocationAuthorrization()
} else {
// Show alert letting the user know they have to turn this on.
}
}
func checkLocationAuthorrization() {
switch CLLocationManager.authorizationStatus() {
case .authorizedWhenInUse:
mapView.showsUserLocation = true
centerViewOnUserLocation()
locationManager.startUpdatingLocation()
break
case .denied:
// Show alret instructing them how to turn on permissions
break
case .notDetermined:
break
case .restricted:
// Show alret letting them know what's up
break
case .authorizedAlways:
break
}
}
}
extension ViewController: CLLocationManagerDelegate {
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location = locations.last else { return }
let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
let region = MKCoordinateRegion.init(center: center, latitudinalMeters: regionInMeters, longitudinalMeters: regionInMeters)
mapView.setRegion(region, animated: true)
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
checkLocationAuthorrization()
}
}

Answer 1

You have to add below permission in Info.plist file
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>Usage Description</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>Usage Description</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Usage Description</string>
Import libraries:
import MapKit
import CoreLocation
Set delegates:
CLLocationManagerDelegate,MKMapViewDelegate
Add variable:
private var locationManager: CLLocationManager!
private var currentLocation: CLLocation?
write below code on viewDidLoad():
mapView.delegate = self
mapView.showsUserLocation = true
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
// Check for Location Services
if CLLocationManager.locationServicesEnabled() {
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
Write delegate method for location:
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
defer { currentLocation = locations.last }
if currentLocation == nil {
// Zoom to user location
if let userLocation = locations.last {
let viewRegion = MKCoordinateRegion(center: userLocation.coordinate, latitudinalMeters: 2000, longitudinalMeters: 2000)
mapView.setRegion(viewRegion, animated: false)
}
}
}
Thats all, Now you able to see your current location and blue dot.

Answer 2

To show user location on map do following steps:
try this path-
Go to product->Edit Scheme->Options->select Allow Location simulation and select default location.
Here You can also add custom location using GPX file.
After setting clean and run the app.

Answer 3

The problem seems to be in method checkLocationAuthorrization, here you have to ask for locationManager.requestWhenInUseAuthorization() when the status is notDetermined, like so:
func checkLocationAuthorization(authorizationStatus: CLAuthorizationStatus? = nil) {
switch (authorizationStatus ?? CLLocationManager.authorizationStatus()) {
case .authorizedAlways, .authorizedWhenInUse:
locationManager.startUpdatingLocation()
mapView.showsUserLocation = true
case .restricted, .denied:
// show alert instructing how to turn on permissions
print("Location Servies: Denied / Restricted")
case .notDetermined:
locationManager.requestWhenInUseAuthorization()
}
}
Also change the delegate method to pass the current status received
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
self.checkLocationAuthorization(authorizationStatus: status)
}
Also note that locationManager.requestWhenInUseAuthorization() will not work, if Info.plist does not have following usage description(s), so edit the Info.plist file and make sure:
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>Message for AlwaysAndWhenInUseUsageDescription</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>Message for AlwaysUsageDescription</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Message for WhenInUseUsageDescription</string>
Finally, you got to wait for an location update to call centerViewOnUserLocation, like so
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location = locations.last else { return }
let span = MKCoordinateSpan(latitudeDelta: 0.05, longitudeDelta: 0.05)
let region = MKCoordinateRegion(center: location.coordinate, span: span)
mapView.setRegion(region, animated: true)
}

Answer 4

Simulator doesn't show current location but you can manually add a location in it by:
Debug -> Location -> Custom Location and then give coordinates.

Answer 5

In your viewDidLoad method please write the below code.
Default value of showsUserLocation is false. So, we have to update it's default value.
override func viewDidLoad() {
super.viewDidLoad()
self.mapView.showsUserLocation = true
checkLocationServices()
}
Refer my updated code.

Answer 6

import UIKit
import MapKit
class ViewController: UIViewController {
#IBOutlet weak var mapview: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
let location = CLLocationCoordinate2D(latitude: "", longitude: "")
let span = MKCoordinateSpanMake(0.5, 0.5)
let region = MKCoordinateRegion(center: location, span: span)
mapview.setRegion(region, animated: true)
let annotation = MKPointAnnotation()
annotation.coordinate = location
annotation.title = "your title"
mapview.addAnnotation(annotation)
}