I'm trying to find the latitude and longitude of the user's location so that I can center the map on the user in viewdidload.
I've implemented what seems to be the right code but the values of userLat (latitude) and userLon (longitude) are way off.
N.B. Somebody else had the same problem as me but his answer was never resolved: Mapbox iOS8 Swift mapView.showUsersLocation
import Mapbox
class ViewController: UIViewController, MGLMapViewDelegate, CLLocationManagerDelegate {
// let locationManager = CLLocationManager()
@IBOutlet weak var mapView: MGLMapView!
override func viewDidLoad() {
super.viewDidLoad()
// Initalise map's center coordinate as vancouver
mapView.setCenterCoordinate(CLLocationCoordinate2D(latitude: 49.283382,
longitude: -123.117394),
zoomLevel: 15, animated: false)
view.addSubview(mapView)
// Set the delegate property of our map view to self after instantiating it.
mapView.delegate = self
// User location
mapView.showsUserLocation = true
let userLoc = mapView.userLocation!
userLoc.title = "Hello"
userLoc.subtitle = "I am here!"
let userLat = userLoc.coordinate.latitude
let userLon = userLoc.coordinate.longitude
print(userLat, userLon)
/*
self.locationManager.requestAlwaysAuthorization()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.startUpdatingLocation()
}*/
}
func mapView(mapView: MGLMapView, annotationCanShowCallout annotation: MGLAnnotation) -> Bool {
return true
}
}
Resulting print:
3.40282346638529e+38 3.40282346638529e+38
The strange thing is that the annotation works fine, and when I click my location I get the title and subtitle.
There is a delegate method called mapViewDidFinishLoadingMap
. Set the center of the map to the user coordinates in this method.
func mapViewDidFinishLoadingMap(_ mapView: MGLMapView) {
mapView.setCenter((mapView.userLocation?.coordinate)!, animated: false)
}
The easiest way to center the map on the user's location is to set MGLMapView.userTrackingMode = .follow
(MGLUserTrackingModeFollow
in Objective C). This will automatically move the map when a location is available.
The reason why you're seeing bogus numbers for MGLMapView.userLocation
is that the user's location typically isn't available yet in viewDidLoad
. Use the mapView:didUpdateUserLocation:
delegate method to be notified when the user's location becomes available and when it updates.
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