Adding Start Button for Location Services [Swift 3.0 - Xcode] - swift

Question

I am trying to add a start button to start up my navigation and to find my current location, but nothing happens after my button is pressed?
Any help would be greatly appreciated!
Note: Map does load up, but the locationManager function does nothing, its just like it hasn't been pressed.
Heres my code:
import UIKit
import MapKit
import CoreLocation
class ThirdViewController: UIViewController , CLLocationManagerDelegate{
let manager = CLLocationManager()
func START(){
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations[0]
let span:MKCoordinateSpan = MKCoordinateSpanMake(0.01,0.01) //shows the size of map screen
let myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude,location.coordinate.longitude)
let region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span)
map.setRegion(region, animated: true)
self.map.showsUserLocation = true
}
}
#IBAction func STARTNAV(_ sender: UIButton) {
START()
}

Answer 1

Use didUpdateLocations delegate method for getting current coordinates
& add Maps configuration in plist file as
//MARK: locations ...
let locationManager = CLLocationManager()
func start() {
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.distanceFilter = 100.0;
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
//locationManager.requestWhenInUseAuthorization()
let authorizationStatus = CLLocationManager.authorizationStatus()
let selector = #selector(self.locationManager.requestWhenInUseAuthorization)
if self.locationManager.responds(to:selector) {
if authorizationStatus == .authorizedAlways
|| authorizationStatus == .authorizedWhenInUse {
self.locationManager.startUpdatingLocation()
}else{
self.locationManager.requestWhenInUseAuthorization()
}
}else{
self.locationManager.startUpdatingLocation()
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
print((locationManager.location?.coordinate.latitude) ?? "No values")
let status = CLAuthorizationStatus.self
print("status-------->\(status)")
let locationValue : CLLocationCoordinate2D = (manager.location?.coordinate)!
let location = CLLocation(latitude: locationValue.latitude, longitude: locationValue.longitude)
CLGeocoder().reverseGeocodeLocation(location, completionHandler: {(placemarks, error) -> Void in
if error != nil{
print("Reverse geocoder failed with error" + error!.localizedDescription)
return
}
if placemarks!.count > 0 {
let pm = placemarks![0]
if let locationName = pm.addressDictionary!["SubLocality"] as? NSString {
print("locationName is \(locationName)")
}
}
else{
print("Problem with the data received from geocoder")
}
})
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print("locationManager-failed")
}