Swift 3 Firebase to MapKit - ios

Question

I am looking to get data from a Firebase Database into a map. I have a good amount working but am stuck. This is all 100% code, no storyboards.
What I have below works. It will show all pins on a map but I am stuck at that point. I want to be able to tap each pin and get the data for that particular pin. When I do, using the code below I will print out "tap" and the array for MTA.
The data could be shown in a pin annotation/info window or in labels below the map in the View Controller. I am unsure of where to put the code/get it to work. I assume not in the for snap in snapshot but I cannot get the data out for each individual record/pin.
View did load for reference:
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.white
self.navigationItem.title = stop
mapContainerView.delegate = self
view.addSubview(mapContainerView)
setUpContorller()
fetchTrip()
}
Function to get coordinates for map:
func fetchTrip(){
let ref = FIRDatabase.database().reference()
let tripsRef = ref.child("Trips").child(stop!)
tripsRef.observeSingleEvent(of: .value, with: { (snapshot) in
for snap in snapshot.children {
let tripSnap = snap as! FIRDataSnapshot
if let dict = tripSnap.value as? [String:AnyObject] {
let lat = dict["lat"] as! CLLocationDegrees
let lng = dict["lng"] as! CLLocationDegrees
let MTA = dict["MTAStop"] as! String
let center = CLLocationCoordinate2D(latitude: lat, longitude: lng)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.08, longitudeDelta: 0.08))
self.stopMTA.append(MTA)
self.mapContainerView.setRegion(region, animated: true)
let pinCoordinate: CLLocationCoordinate2D = CLLocationCoordinate2DMake(lat, lng)
let annotation = MKPointAnnotation()
annotation.coordinate = pinCoordinate
self.mapContainerView.addAnnotation(annotation)
}
}
})
}
Function to tap pin: (I know I need more.. not sure what, possibly a class to hold the data.)
func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
// do something
print("tap")
print(stopMTA)
}
Here is an example of the database from simulator testing.
Thanks in advance!

Answer 1

Using MKPointAnnotation() will only place a pin on the map. You need to use a custom class to hold the annotation information and call it with initializers.
Original:
let annotation = MKPointAnnotation()
annotation.coordinate = pinCoordinate
self.mapContainerView.addAnnotation(annotation)
Working version:
let annotation = PinAnnotation(title: MTA, coordinate: pinCoordinate, info: MTA)
annotation.coordinate = pinCoordinate
self.mapContainerView.addAnnotation(annotation)
Also Need:
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
}
and
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
}