Swift 3 - MKPointAnnotation自定义图像

Question

这是我的代码,我想添加自定义引脚(.png文件)而不是红色引脚.我试图使用MKPinAnnotationView和MKAnnotationView,但我无法添加坐标,字幕和标题.我是iOS开发的新手.

override func viewDidLoad() {
    super.viewDidLoad()
    // Handle the text field’s user input through delegate callbacks.
    commentTextField.delegate = self

    coreLocationManager.delegate = self
    //desired accuracy is the best accuracy, very accurate data for the location
    coreLocationManager.desiredAccuracy = kCLLocationAccuracyBest
    //request authorization from the user when user using my app
    coreLocationManager.requestWhenInUseAuthorization()

    coreLocationManager.startUpdatingLocation()

    dbRef = FIRDatabase.database().reference()

    struct Location {
        let title: String
        let latitude: Double
        let longitude: Double
        let subtitle: String
    }
    // Locations array
    let locations = [
        Location(title: "Dio Con Dio",    latitude: 40.590130, longitude: 23.036610,subtitle: "cafe"),
        Location(title: "Paradosiako - Panorama", latitude: 40.590102, longitude: 23.036180,subtitle: "cafe"),
        Location(title: "Veranda",     latitude: 40.607740, longitude: 23.103044,subtitle: "cafe")
    ]

    for location in locations {
        let annotation = MKPointAnnotation()

        annotation.title = location.title
        annotation.coordinate = CLLocationCoordinate2D(latitude: location.latitude, longitude: location.longitude)
        annotation.subtitle = location.subtitle

        map.addAnnotation(annotation)
    }



}

Answer 1

您需要将视图控制器指定为地图视图的委托(在IB中或以编程方式进行viewDidLoad,然后(a)指定您符合MKMapViewDelegate协议;以及(b)实现mapView(_:viewFor:):

extension ViewController: MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        let identifier = "MyPin"

        if annotation is MKUserLocation {
            return nil
        }

        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)

        if annotationView == nil {
            annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: identifier)
            annotationView?.canShowCallout = true
            annotationView?.image = UIImage(named: "custom_pin.png")

            // if you want a disclosure button, you'd might do something like:
            //
            // let detailButton = UIButton(type: .detailDisclosure)
            // annotationView?.rightCalloutAccessoryView = detailButton
        } else {
            annotationView?.annotation = annotation
        }

        return annotationView
    }
}

有关更多信息,请参阅位置和映射编程指南:从代理对象创建注释视图.代码片段在Objective-C中,但它描述了基本过程.