Kevin Kevin - 6 days ago 6
Swift Question

Swift MKMapView Drop a Pin Annotation to Current Location

I am looking to be able to ask the app user for his/her current location and a pin to be automatically dropped on that location. Here is my code for grabbing the current location, but I am having trouble understanding how I can drop a pin for the current location.

import UIKit
import MapKit
import CoreLocation


class MapVC: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {



@IBOutlet weak var map: MKMapView!

let locationManager = CLLocationManager()

override func viewDidLoad() {
super.viewDidLoad()

// User's location

locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
if #available(iOS 8.0, *) {
locationManager.requestAlwaysAuthorization()
} else {
// Fallback on earlier versions
}
locationManager.startUpdatingLocation()

// add gesture recognizer
let longPress = UILongPressGestureRecognizer(target: self, action: #selector(MapVC.mapLongPress(_:))) // colon needs to pass through info
longPress.minimumPressDuration = 1.5 // in seconds
//add gesture recognition
map.addGestureRecognizer(longPress)
}

// func called when gesture recognizer detects a long press

func mapLongPress(_ recognizer: UIGestureRecognizer) {

print("A long press has been detected.")

let touchedAt = recognizer.location(in: self.map) // adds the location on the view it was pressed
let touchedAtCoordinate : CLLocationCoordinate2D = map.convert(touchedAt, toCoordinateFrom: self.map) // will get coordinates

let newPin = MKPointAnnotation()
newPin.coordinate = touchedAtCoordinate
map.addAnnotation(newPin)


}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

let location = locations.last! as CLLocation

let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))




//set region on the map
self.map.setRegion(region, animated: true)



}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}


}

Answer

If you want to add pin to user location you can do that in didUpdateLocations delegate method like this

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    mapView.removeAnnotation(newPin)

    let location = locations.last! as CLLocation

    let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
    let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))        

    //set region on the map
    map.setRegion(region, animated: true)

    newPin.coordinate = location.coordinate
    map.addAnnotation(newPin)

}

Create a global variable for your pin

let newPin = MKPointAnnotation()

So whenever user will move to a new location the previous pin will be removed and a new pin will be added to updated location.