In Swift, IBOutlet unexpectly found nil on self delegate? - swift

Question

This problem is absolutely driving me insane, and I've searched all over with no luck finding a solution. Please forgive what is probably a basic question...
I followed a tutorial to make a simple Geofence application. Problem is, my MKMapView keeps giving me a nil variable when I declare it, giving me the "unexpectedly found nil while unwrapping an Optional value" error.
The variable in question is mapView, and the line that's giving me an issue is mapView.delegate = self
Here's my code:
import UIKit
import CoreLocation
import MapKit
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
#IBOutlet weak var mapView: MKMapView!
let locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
// setup locationManager
locationManager.delegate = self
locationManager.distanceFilter = kCLLocationAccuracyNearestTenMeters
locationManager.desiredAccuracy = kCLLocationAccuracyBest
// setup mapView
mapView.delegate = self
mapView.showsUserLocation = true
mapView.userTrackingMode = .follow
// setup test data
setupData()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// status is not determined
if CLLocationManager.authorizationStatus() == .notDetermined {
locationManager.requestAlwaysAuthorization()
}
// authorization were denied
else if CLLocationManager.authorizationStatus() == .denied {
showAlert(title: "Location services were previously denied. Please enable location services for this app in Settings.")
}
// we do have authorization
else if CLLocationManager.authorizationStatus() == .authorizedAlways {
locationManager.startUpdatingLocation()
}
}
func setupData() {
// check if can monitor regions
if CLLocationManager.isMonitoringAvailable(for: CLCircularRegion.self) {
// region data
let title = "Weber"
let coordinate = CLLocationCoordinate2DMake(37.703026, -121.759735)
let regionRadius = 300.0
// setup region
let region = CLCircularRegion(center: CLLocationCoordinate2D(latitude: coordinate.latitude, longitude: coordinate.longitude), radius: regionRadius, identifier: title)
locationManager.startMonitoring(for: region)
// setup annotation
let restaurantAnnotation = MKPointAnnotation()
restaurantAnnotation.coordinate = coordinate;
restaurantAnnotation.title = "\(title)";
mapView.addAnnotation(restaurantAnnotation)
// setup circle
let circle = MKCircle(center: coordinate, radius: regionRadius)
mapView.add(circle)
}
else {
print("System can't track regions")
}
}
// MARK: - MKMapViewDelegate
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
let circleRenderer = MKCircleRenderer(overlay: overlay)
circleRenderer.strokeColor = UIColor.blue
circleRenderer.lineWidth = 1.0
return circleRenderer
}
// MARK: - CLLocationManagerDelegate
func locationManager(_ manager: CLLocationManager, didEnterRegion region: CLRegion) {
showAlert(title: "enter \(region.identifier)")
}
func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) {
showAlert(title: "exit \(region.identifier)")
}
// MARK: - Helpers
func showAlert(title: String) {
let alert = UIAlertController(title: title, message: nil, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
}