AnnotationView Not Displaying - ios

Question

I created a custom annotation view called "PlaceAnnotationView" as shown below:
import Foundation
import MapKit
class PlaceAnnotationView : MKPinAnnotationView {
override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
Then in viewForAnnotation I return my custom annotation view as shown:
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
if annotation is MKUserLocation {
return nil
}
var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "PlaceAnnotationView")
if annotationView == nil {
annotationView = PlaceAnnotationView(annotation: annotation, reuseIdentifier: "PlaceAnnotationView")
annotationView?.canShowCallout = true
}
return annotationView
}
Here is the code to add annotations:
private func populateNearByPlaces() {
var region = MKCoordinateRegion()
region.center = CLLocationCoordinate2D(latitude: self.mapView.userLocation.coordinate.latitude, longitude: self.mapView.userLocation.coordinate.longitude)
let request = MKLocalSearchRequest()
request.naturalLanguageQuery = self.selectedCategory
request.region = region
let search = MKLocalSearch(request: request)
search.start { (response, error) in
guard let response = response else {
return
}
for item in response.mapItems {
let annotation = PlaceAnnotation()
annotation.title = item.name
annotation.subtitle = "subtitle"
annotation.mapItem = item
DispatchQueue.main.async {
self.mapView.addAnnotation(annotation)
}
}
}
}
Here is the code for PlaceAnnotationView:
import Foundation
import MapKit
class PlaceAnnotationView : MKPinAnnotationView {
override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
Here is the code for PlaceAnnotation:
import Foundation
import MapKit
class PlaceAnnotation : MKPointAnnotation {
var mapItem :MKMapItem!
}
But I don't see any of my annotations being displayed on the map. The viewForAnnotation is fired multiple times for each of my annotation but does not display anything on the screen.

Answer 1

Based on the code that you have (so reluctantly) chosen to reveal, it seems the problem is that you never set the annotation's coordinate. But an annotation's coordinate is crucial. This is how the annotation tells where it is supposed to be in the world, and how the annotation view associated with this annotation knows where on the map to appear. Therefore the annotation view associated with this annotation does not know where on the map to appear. Therefore it doesn't appear.