How do I make "Center location on Map" work? - ios

Question

I am new to programing.
I have found the code below and it does everything but center location.(zoom in, map, blue dot all work.)
If I run in simulator, (city run) the blue dot just runs off the page.
import UIKit
import MapKit
import CoreLocation
import Foundation
class ViewController: UIViewController, CLLocationManagerDelegate {
#IBOutlet weak var map: MKMapView!
var locationManager: CLLocationManager?
override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager!.delegate = self
map.showsUserLocation = true
if CLLocationManager.authorizationStatus() == .authorizedWhenInUse {
locationManager!.startUpdatingLocation()
} else {
locationManager!.requestWhenInUseAuthorization()
}
}
private func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
switch status {
case .notDetermined:
print("NotDetermined")
case .restricted:
print("Restricted")
case .denied:
print("Denied")
case .authorizedAlways:
print("AuthorizedAlways")
case .authorizedWhenInUse:
print("AuthorizedWhenInUse")
locationManager!.startUpdatingLocation()
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations.first!
let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate, 500, 500)
map.setRegion(coordinateRegion, animated: true)
locationManager?.stopUpdatingLocation()
locationManager = nil
}
}

Answer 1

Delete your implementation of
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
Just get authorization, set map.showsUserLocation = true, and stand back.

Answer 2

Here is my Swift 3 code that works and is tested. It loads mapView, ask user's permission and zoom in into his location.
import UIKit
import MapKit
class ViewController: UIViewController, CLLocationManagerDelegate {
#IBOutlet weak var mapView: MKMapView!
let locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.activityType = .automotiveNavigation
locationManager.distanceFilter = 10.0
mapView.showsUserLocation = true
mapView.mapType = .standard
self.mapView.delegate = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let userLocation:CLLocation = locations[0] as CLLocation
locationManager.stopUpdatingLocation()
let location = CLLocationCoordinate2D(latitude: userLocation.coordinate.latitude, longitude: userLocation.coordinate.longitude)
let span = MKCoordinateSpanMake(0.05, 0.05)
let region = MKCoordinateRegion (center: location,span: span)
mapView.setRegion(region, animated: true)
}
}