Point conversion

import Mapbox
class ViewController: UIViewController, MGLMapViewDelegate {
var mapView: MGLMapView!
override func viewDidLoad() {
super.viewDidLoad()
mapView = MGLMapView(frame: view.bounds)
mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(mapView)
// Add a single tap gesture recognizer. This gesture requires the built-in MGLMapView tap gestures (such as those for zoom and annotation selection) to fail.
let singleTap = UITapGestureRecognizer(target: self, action: #selector(handleMapTap(sender:)))
for recognizer in mapView.gestureRecognizers! where recognizer is UITapGestureRecognizer {
singleTap.require(toFail: recognizer)
}
mapView.addGestureRecognizer(singleTap)
// Convert `mapView.centerCoordinate` (CLLocationCoordinate2D) to screen location (CGPoint).
let centerScreenPoint: CGPoint = mapView.convert(mapView.centerCoordinate, toPointTo: nil)
print("Screen center: \(centerScreenPoint) = \(mapView.center)")
}
@objc @IBAction func handleMapTap(sender: UITapGestureRecognizer) {
// Convert tap location (CGPoint) to geographic coordinate (CLLocationCoordinate2D).
let tapPoint: CGPoint = sender.location(in: mapView)
let tapCoordinate: CLLocationCoordinate2D = mapView.convert(tapPoint, toCoordinateFrom: nil)
print("You tapped at: \(tapCoordinate.latitude), \(tapCoordinate.longitude)")
// Create an array of coordinates for our polyline, starting at the center of the map and ending at the tap coordinate.
var coordinates: [CLLocationCoordinate2D] = [mapView.centerCoordinate, tapCoordinate]
// Remove any existing polyline(s) from the map.
if mapView.annotations?.count != nil, let existingAnnotations = mapView.annotations {
mapView.removeAnnotations(existingAnnotations)
}
// Add a polyline with the new coordinates.
let polyline = MGLPolyline(coordinates: &coordinates, count: UInt(coordinates.count))
mapView.addAnnotation(polyline)
}
}