Swift 3 - MKPointAnnotation 自定义图像

使用Swift 3中的MKPointAnnotation自定义图像是一种简单而有趣的方式，可以在地图上显示自定义的标记图像。MKPointAnnotation是MapKit框架中的一个类，用于在地图上显示一个点标记。在这篇文章中，我们将学习如何使用MKPointAnnotation来显示自定义图像，并为其添加标题。

swift
let image = UIImage(named: "customImage")

swift
import MapKit
class ViewController: UIViewController, MKMapViewDelegate {
    @IBOutlet weak var mapView: MKMapView!
    override func viewDidLoad() {
        super.viewDidLoad()
        let annotation = MKPointAnnotation()
        annotation.coordinate = CLLocationCoordinate2D(latitude: 37.33182, longitude: -122.03118)
        annotation.title = "Apple Park"
        
        let image = UIImage(named: "customImage")
        annotation.image = image
        
        mapView.addAnnotation(annotation)
    }
}

swift
import MapKit
class ViewController: UIViewController, MKMapViewDelegate {
    @IBOutlet weak var mapView: MKMapView!
    override func viewDidLoad() {
        super.viewDidLoad()
        mapView.delegate = self
        
        let annotation = MKPointAnnotation()
        annotation.coordinate = CLLocationCoordinate2D(latitude: 37.33182, longitude: -122.03118)
        annotation.title = "Apple Park"
        
        let image = UIImage(named: "customImage")
        annotation.image = image
        
        mapView.addAnnotation(annotation)
    }
    
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        if annotation is MKUserLocation {
            return nil
        }
        
        let reuseIdentifier = "CustomAnnotationView"
        
        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: reuseIdentifier)
        
        if annotationView == nil {
            annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseIdentifier)
        } else {
            annotationView?.annotation = annotation
        }
        
        annotationView?.image = (annotation as? MKPointAnnotation)?.image
        annotationView?.canShowCallout = true
        
        return annotationView
    }
}