Annotations for MKLocalSearch in Swift 3 — Map View Current Location - swift

Question

This is my first time on Stack Overflow. I have been trying to make an app that finds the user's current location and outputs the information the doctors close to the user. So far, I can find the current location, however, I am not able to add an annotation for the doctors near the current location.
Here is my code so far:
import UIKit
import MapKit
import CoreLocation
class ThirdViewController: UIViewController, CLLocationManagerDelegate {
#IBOutlet weak var map: MKMapView!
let manager = CLLocationManager()
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
let location = locations[0]
let span:MKCoordinateSpan = MKCoordinateSpanMake(0.01, 0.01)
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
}
override func viewDidLoad()
{
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
let request = MKLocalSearchRequest()
request.naturalLanguageQuery = "doctor"
request.region = map.region
let localSearch:MKLocalSearch = MKLocalSearch(request: request)
localSearch.start(completionHandler: {(result, error) in
for placemark in (result?.mapItems)! {
if(error == nil) {
let annotation = MKPointAnnotation()
annotation.coordinate = CLLocationCoordinate2DMake(placemark.placemark.coordinate.latitude, placemark.placemark.coordinate.longitude)
annotation.title = placemark.placemark.name
annotation.subtitle = placemark.placemark.title
self.map.addAnnotation(annotation)
}
else
{
print(error ?? 0)
}
}
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
All responses are appreciated and if you have any advice for what I should do next time I ask a question, please leave it down below. Thank you.

Answer 1

Your map view needs a delegate with a map​View(_:​view​For:​) implementation. Otherwise, adding an annotation will have no visible effect.

Answer 2

To add an annotation you need to inherit MKMapViewDelegate.
Then add: mapView.delegate = self to your initialization method.
And implement this functions:
func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
if !(view.annotation! is MKUserLocation) {
let customPin = view.annotation as! CustomPin //if u wanna use custom pins
configureDetailView(annotationView: view, spotPin: customPin.spotDetailsItem) //configuring view for tap
}
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
if annotation is MKUserLocation {
return nil
}
if !(annotation is CustomPin) {
return nil
}
let identifier = "CustomPin"
var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)
if annotationView == nil {
annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
annotationView?.canShowCallout = true
} else {
annotationView!.annotation = annotation
}
return annotationView
}
configureDetailView method and other information you can find here (its is quite cumbersome)