用图片标记地图上的某个位置

import Mapbox
 
class ViewController: UIViewController, MGLMapViewDelegate {
override func viewDidLoad() {
super.viewDidLoad()
 
let mapView = MGLMapView(frame: view.bounds, styleURL: MGLStyle.lightStyleURL)
mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
mapView.tintColor = .darkGray
 
// Set the map's bounds to Pisa, Italy.
let bounds = MGLCoordinateBounds(
sw: CLLocationCoordinate2D(latitude: 43.7115, longitude: 10.3725),
ne: CLLocationCoordinate2D(latitude: 43.7318, longitude: 10.4222))
mapView.setVisibleCoordinateBounds(bounds, animated: false)
 
view.addSubview(mapView)
 
// Set the map view‘s delegate property.
mapView.delegate = self
 
// Initialize and add the point annotation.
let pisa = MGLPointAnnotation()
pisa.coordinate = CLLocationCoordinate2D(latitude: 43.72305, longitude: 10.396633)
pisa.title = "Leaning Tower of Pisa"
mapView.addAnnotation(pisa)
}
 
func mapView(_ mapView: MGLMapView, imageFor annotation: MGLAnnotation) -> MGLAnnotationImage? {
// Try to reuse the existing ‘pisa’ annotation image, if it exists.
var annotationImage = mapView.dequeueReusableAnnotationImage(withIdentifier: "pisa")
 
if annotationImage == nil {
// Leaning Tower of Pisa by Stefan Spieler from the Noun Project.
var image = UIImage(named: "pisavector")!
 
// The anchor point of an annotation is currently always the center. To
// shift the anchor point to the bottom of the annotation, the image
// asset includes transparent bottom padding equal to the original image
// height.
//
// To make this padding non-interactive, we create another image object
// with a custom alignment rect that excludes the padding.
image = image.withAlignmentRectInsets(UIEdgeInsets(top: 0, left: 0, bottom: image.size.height/2, right: 0))
 
// Initialize the ‘pisa’ annotation image with the UIImage we just loaded.
annotationImage = MGLAnnotationImage(image: image, reuseIdentifier: "pisa")
}
 
return annotationImage
}
 
func mapView(_ mapView: MGLMapView, annotationCanShowCallout annotation: MGLAnnotation) -> Bool {
// Always allow callouts to popup when annotations are tapped.
return true
}
}