How to add title and subtitle to my annotations in swift 3? - ios

Question

I've tried to add title and subtitle to my annotations, but all my attempts had failed. Please help me!
import UIKit
import MapKit
class MyPointAnnotation : MKPointAnnotation{
var pinTintColor: UIColor?
}
class MapViewController: UIViewController, MKMapViewDelegate {
#IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self;
let hello = MyPointAnnotation()
hello.coordinate = CLLocationCoordinate2D(latitude: 46.771210, longitude: 23.623635)
hello.title = "tile"
hello.subtitle = "subtitle"
hello.pinTintColor = .blue
let hellox = MyPointAnnotation()
hellox.coordinate = CLLocationCoordinate2D(latitude: 44.426767, longitude: 26.102538)
hellox.pinTintColor = .blue
mapView.addAnnotation(hello)
mapView.addAnnotation(hellox)
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "myAnnotation") as? MKPinAnnotationView
if annotationView == nil {
annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "myAnnotation")
} else {
annotationView?.annotation = annotation
}
if let annotation = annotation as? MyPointAnnotation {
if #available(iOS 9.0, *) {
annotationView?.pinTintColor = annotation.pinTintColor
} else {
// Fallback on earlier versions
}
}
return annotationView
}
}

Answer 1

My problem solved with below code.In swift 4
#IBOutlet weak var map: MKMapView!
override func viewDidLoad() {
let location = CLLocationCoordinate2D(latitude: 12.956360, longitude: 77.716615)
let annotation = MKPointAnnotation()
annotation.coordinate = CLLocationCoordinate2D(latitude: 12.956360, longitude: 77.716615)
map.setRegion(MKCoordinateRegionMakeWithDistance(location, 1500, 1500), animated: true)
annotation.title = "your title"
annotation.subtitle = "your subtitle"
map.addAnnotation(annotation);
}

Answer 2

You need set canShowCallout true to show title and subtitle.
Try the following code.
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "myAnnotation") as? MKPinAnnotationView
if annotationView == nil {
annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "myAnnotation")
annotationView?.canShowCallout = true
} else {
annotationView?.annotation = annotation
}
if let annotation = annotation as? MyPointAnnotation {
if #available(iOS 9.0, *) {
annotationView?.pinTintColor = annotation.pinTintColor
} else {
// Fallback on earlier versions
}
}
return annotationView
}