Information Technology

Help!! I get fatal error whenever I try to obtain the user location

iOS Programming - 8 hours 9 min ago

This is my code. The error happens at this line: mapView.showsUserLocation = true

Please Help.


// MainVC.swift

// aidkit


// Created by Roberto Guarneros on 1/15/19.

// Copyright © 2019 Roberto Guarneros. All rights reserved.


import UIKit

import MapKit

import CoreLocation

class MainVC: UIViewController, MKMapViewDelegate {

@IBOutlet var helpLabel: UILabel!

@IBOutlet weak var mapView: MKMapView!

let locationManager = CLLocationManager()

let regionInMeters: Double = 10000

override func viewDidLoad() {



NotificationCenter.default.addObserver(self, selector: #selector(showFirstAidKit), name: NSNotification.Name("ShowFirstAidKit"), object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(showCPR), name: NSNotification.Name("ShowCPR"), object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(showBleeding), name: NSNotification.Name("ShowBleeding"), object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(showChoking), name: NSNotification.Name("ShowChoking"), object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(showSeizures), name: NSNotification.Name("ShowSeizures"), object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(showSprains), name: NSNotification.Name("ShowSprains"), object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(showBurns), name: NSNotification.Name("ShowBurns"), object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(showFractures), name: NSNotification.Name("ShowFractures"), object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(showMap), name: NSNotification.Name("ShowMap"), object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(showHelp), name: NSNotification.Name("ShowHelp"), object: nil)


func setUpLocationManger() {

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(){



}else {

//show alert



func checkLocationAuthorization(){

switch CLLocationManager.authorizationStatus(){

case .authorizedWhenInUse:

mapView.showsUserLocation = true




case . denied:


case .notDetermined:



case .restricted:


case .authorizedAlways:




@objc func showFirstAidKit(){

performSegue(withIdentifier: "ShowFirstAidKit", sender: nil)


@objc func showCPR(){

performSegue(withIdentifier: "ShowCPR", sender: nil)


@objc func showBleeding(){

performSegue(withIdentifier: "ShowBleeding", sender: nil)


@objc func showChoking(){

performSegue(withIdentifier: "ShowChoking", sender: nil)


@objc func showSeizures(){

performSegue(withIdentifier: "ShowSeizures", sender: nil)


@objc func showSprains(){

performSegue(withIdentifier: "ShowSprains", sender: nil)


@objc func showBurns(){

performSegue(withIdentifier: "ShowBurns", sender: nil)


@objc func showFractures(){

performSegue(withIdentifier: "ShowFractures", sender: nil)


@objc func showHelp(){

performSegue(withIdentifier: "ShowHelp", sender: nil)


@objc func showMap(){

performSegue(withIdentifier: "ShowMap", sender: nil)


@IBAction func onMoreTapped() {

print ("Toggle Side Menu") NSNotification.Name("ToggleSideMenu"), object: nil)


@IBAction func helpButton(_ sender: Any) {

if helpLabel.isHidden {

helpLabel.isHidden = false

} else {

helpLabel.isHidden = true



@IBAction func linkButton1(_ sender: Any) { "")! as URL, options: [:], completionHandler: nil)


@IBAction func linkButton2(_ sender: Any) { "")! as URL, options: [:], completionHandler: nil)


@IBAction func linkButton3(_ sender: Any) { "")! as URL, options:[:], completionHandler: nil)


@IBAction func linkButton4(_ sender: Any) { "")! as URL, options: [:], completionHandler: nil)


@IBAction func linkButton5(_ sender: Any) { "")! as URL, options: [:], completionHandler: nil)


@IBAction func linkButton6(_ sender: Any) { "")! as URL, options: [:], completionHandler: nil)


@IBAction func linkButton7(_ sender: Any) { "")! as URL, options: [:], completionHandler: nil)



extension MainVC: CLLocationManagerDelegate {

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

guard let location = locations.last else { return }

let region = MKCoordinateRegion.init(center: location.coordinate, latitudinalMeters: regionInMeters, longitudinalMeters: regionInMeters)

mapView.setRegion(region,animated : true)


func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {




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