Swift: How would I pass map pin data to a new VC? - ios

Question

I'm struggling with passing data from a map pin to a new vc.
Scenario
Map pin data (name, subtitle & coordinates) are currently being read from a JSON file. Map pins are dropped, when map pin has been clicked a new view will open and display the corresponding title and subtitle and some other data in labels in a new vc.
I've been following this tutorial for extracting data from a JSON file.
Issue: I'm struggling to find a way to pass the data from the map pin to the labels.
I've done a previous project where I pass data from one textfield to a label.
Thank you very much!
EDIT:
I realised I didn't give any code.
newFeatureVC
// Callout accessory
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let identifier = "POIAnnotations"
if annotation is POIAnnotations {
var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)
if annotationView == nil {
annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
annotationView!.canShowCallout = true
let button = UIButton(type: .detailDisclosure)
annotationView!.rightCalloutAccessoryView = button
}
else {
annotationView!.annotation = annotation
}
return annotationView
}
return nil
}
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
if control == view.rightCalloutAccessoryView {
performSegue(withIdentifier: "showAnnotationInfo", sender: self)
}
}
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showAnnotationInfo" {
let destViewController = segue.destination as! ShopDetailViewController
}
}
POIAnnotations
This class is where variables stored for the name, subtitle and coordinates.
class POIAnnotations: NSObject, MKAnnotation {
var title: String?
var subtitle: String?
var coordinate: CLLocationCoordinate2D
init(title:String, subtitle:String, coordinate:CLLocationCoordinate2D) {
self.title = title
self.subtitle = subtitle
self.coordinate = coordinate
super.init()
}
class func fromJSON(_ json: [JSONValue]) -> POIAnnotations? {
// 1
var title: String
if let titleOrNil = json[1].string {
title = titleOrNil
} else {
title = ""
}
var subtitle: String
if let subtitleOrNil = json[2].string {
subtitle = subtitleOrNil
} else {
subtitle = ""
}
// 2
let latitude = (json[3].string! as NSString).doubleValue
let longitude = (json[4].string! as NSString).doubleValue
let coordinate = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
// 3
return POIAnnotations(title: title, subtitle: subtitle, coordinate: coordinate)
}
}
SecondVC
class ShopDetailViewController: UIViewController {
#IBOutlet weak var shopName: UILabel!
#IBOutlet weak var shopRating: UILabel!
#IBOutlet weak var cancelButton: UIBarButtonItem!
var shopNameData = "name"
var shopRatingData = "rating"
What I've already tried doing is the same way that I got the data from the JSON file in the POIAnnotations class.
I tried calling the fromJSON function then tried storing it in variable to display on the label. But I couldn't get my head around how to do it.

Answer 1

Use MKMapViewDelegate method to detect which pin is tapped and then display its data in view controller.
func mapView(MKMapView, didSelect: MKAnnotationView)