Embed UINavigationController into MapKit programatically (in Swift) to hold UISearchController - ios

Question

I'm trying to add a search bar to my map programatically, and have established that I need to add a navigation controller to my map view in order to format the search bar correctly at the top of the view. I have come to the conclusion I actually need a UISearchController, rather than a UI SearchBar. However, I do not have a navigation controller coded into the app from the AppDelegate file because I am also using a tabBarController, which is coded in the app delegate.
Basically, I'm looking for a way to embed a UINavigationController into my map view programatically so I can add the UISearchController to the NavigationController.
The ultimate goal is to create a map with a search feature to allow users to search for locations - if anyone has other suggestions of how I can accomplish this goal within the framework I already have it would be much appreciated!
My AppDelegate and map view code are below.
AppDelegate
import UIKit
import Firebase
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
window = UIWindow(frame: UIScreen.main.bounds)
window?.makeKeyAndVisible()
window?.rootViewController = TabBarController()
return true
}
}
MapViewController
import UIKit
import MapKit
import CoreLocation
class MapViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
var mapVw: MKMapView!
let locationManager = CLLocationManager()
var regionHasBeenCentered = false
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations[0]
if !regionHasBeenCentered {
let span: MKCoordinateSpan = MKCoordinateSpanMake(0.5, 0.5)
let userLocation: CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
let region: MKCoordinateRegion = MKCoordinateRegionMake(userLocation, span)
mapVw.setRegion(region, animated: true)
regionHasBeenCentered = true
}
self.mapVw.showsUserLocation = true
}
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestAlwaysAuthorization()
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
setupMapView()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
}
func setupMapView() {
mapVw = MKMapView()
mapVw.delegate = self
let leftMargin:CGFloat = 0
let topMargin:CGFloat = 0
let mapWidth:CGFloat = view.frame.size.width
let mapHeight:CGFloat = view.frame.size.height
mapVw.frame = CGRect(x: leftMargin, y: topMargin, width: mapWidth, height: mapHeight)
let noLocation = self.mapVw.userLocation.coordinate
let span:MKCoordinateSpan = MKCoordinateSpanMake(0.05, 0.05)
let pinLocation = MKCoordinateRegionMake(noLocation, span)
mapVw.setRegion(pinLocation, animated: true)
print(pinLocation)
print(noLocation)
//setup long press gesture
let longPress = UILongPressGestureRecognizer(target: self, action: #selector(self.addAnnotation(_:)))
self.mapVw.addGestureRecognizer(longPress)
view.addSubview(mapVw)
}
#objc func addAnnotation(_ gestureRecognizer:UIGestureRecognizer) {
if gestureRecognizer.state != UIGestureRecognizerState.began {
return
}
let touchPoint = gestureRecognizer.location(in: self.mapVw)
let newCoordinates = self.mapVw.convert(touchPoint, toCoordinateFrom: self.mapVw)
let annotation = MKPointAnnotation()
annotation.coordinate = newCoordinates
annotation.title = "Virtual Location"
annotation.subtitle = "Dropped Pin"
self.mapVw.removeAnnotations(mapVw.annotations)//remove previous pin
self.mapVw.removeAnnotation(annotation)
//create circle attributes
let cent = newCoordinates
let rad: Double = 500 //adjust radius to make circle bigger.
let circle = MKCircle(center: cent, radius: rad)
self.mapVw.addAnnotation(annotation)
self.mapVw.removeOverlays(self.mapVw.overlays)//remove previous circle
self.mapVw.add(circle)
print(newCoordinates)
print(circle)
}
//circle overlay function
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
if overlay.isKind(of: MKCircle.self){
let circleRenderer = MKCircleRenderer(overlay: overlay)
circleRenderer.fillColor = UIColor.blue.withAlphaComponent(0.05)
circleRenderer.strokeColor = UIColor.blue
circleRenderer.lineWidth = 0.5
return circleRenderer
}
self.mapVw.removeOverlays(overlay as! [MKCircle])
print(overlay)
return MKOverlayRenderer(overlay: overlay)
}
}
TabBarController
import UIKit
class TabBarController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let messagesController = MessagesController()
let messagesNavController = UINavigationController(rootViewController: MessagesController())
messagesNavController.tabBarItem.title = "Messages"
let postsVC = PostsViewController()
postsVC.tabBarItem.title = "Posts"
let organiserVC = OrganiserViewController()
organiserVC.tabBarItem.title = "Organiser"
let mapVC = MapViewController()
mapVC.tabBarItem.title = "Map"
let mapNavigationController = UINavigationController(rootViewController: mapVC)
viewControllers = [messagesNavController, postsVC, organiserVC, mapVC]
}
}