show distance on annotation from current location to another point - ios

Question

I want to show my total distance from my current location to another point and I want the distance shows in subtitle of Annotation.
Here is my code but it doesn't work :
func shopDeal () {
var inKm = ""
let locationsq =
[["title": "Shop Deal","subtitle": "\(inKm) km", "latitude": 31.352792, "longitude": 74.253201],
["title": "Shop Deal", "subtitle": "\(inKm) km", "latitude": 31.403563, "longitude": 74.258200]]
// Span
for location in locationsq {
let annotation = MKPointAnnotation()
annotation.title = location["title"] as? String
annotation.subtitle = location["subtitle"] as? String
annotation.coordinate = CLLocationCoordinate2D(latitude: location["latitude"] as! Double, longitude: location["longitude"] as! Double)
mapView.addAnnotation(annotation)
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let myCurrentLoc = locations[locations.count - 1]
let coor1 = CLLocation(latitude: annotation.coordinate.latitude, longitude: annotation.coordinate.longitude)
let coor2 = CLLocation (latitude: myCurrentLoc.coordinate.latitude, longitude: myCurrentLoc.coordinate.longitude )
let distanceInMeters:CLLocationDistance = coor1.distanceFromLocation(coor2)
inKm = String(format: "%.2f", distanceInMeters / 1000)
print("\(inKm) km")
}
}
mapView.delegate = self
}
Any help is highly appreciated. Thanks in advance

Answer 1

Finding Distance between two points(LAT and LONG) on Map :
let coordinate1 = CLLocation(latitude: 5.0, longitude: 5.0)
let coordinate2 = CLLocation(latitude: 5.0, longitude: 3.0)
//Decalare distanceInMeters as global variables so that you can show distance on subtitles
let distanceInMeters = coordinate1.distance(from: coordinate2)
Now if you want to show distance in subtitle of annotation then :
func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
if annotation is MKUserLocation {
return nil
}
let reuseId = "pinIdentifier"
var pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
if pinView == nil {
pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
pinView!.canShowCallout = true
}
else {
pinView!.annotation = annotation
}
//Adding Subtitle text
let subtitleView = UILabel()
//Decalare distanceInMeters as global variables so that you can show distance on subtitles
subtitleView.text = "\(distanceInMeters)"
pinView!.detailCalloutAccessoryView = subtitleView
return pinView
}
Feel free to comment if further any issue

Answer 2

Try this!
// 1. Get Source & Destination coordinates (Hard-cored here)
let locSource : CLLocation = CLLocation.init(latitude: 17.428031, longitude: 78.377837)
let locDestination : CLLocation = CLLocation.init(latitude: 17.441879, longitude: 78.429990)
// 2. Find distance between the Source & Destination
let nDistanceInMeters : CLLocationDistance = locSource.distance(from: locDestination)
let nDistanceInKiloMeters : CLLocationDistance = nDistanceInMeters / 1000.0;
// 3. Convert to String
let strDistanceInMeters : String = String.init(format: "%f", nDistanceInMeters)
let strDistanceInKM : String = String.init(format: "%f", nDistanceInKiloMeters)
// 4. Assign the calculated distance to your label,
// Probably in mapView(mapView:viewForAnnotation annotation:
lblDistanceLabelOnAnnotationView.text = strDistanceInKM
Hope that helps!