ios - Swift 3 - MKPointAnnotation 自定义图像

Question

这是我的代码，我想添加一个自定义图钉(.png 文件)而不是红色图钉。我尝试使用 MKPinAnnotationView 和 MKAnnotationView，但无法添加坐标、字幕和标题。我是 iOS 开发新手。

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

您需要将您的 View Controller 指定为 map View 的委托(delegate)(在 IB 中或以编程方式在 viewDidLoad 中，然后 (a) 指定您符合 MKMapViewDelegate 协议(protocol)；和 (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
    }
}

有关详细信息，请参阅 Location and Maps Programming Guide: Creating Annotation Views from Your Delegate Object .代码片段在 Objective-C 中，但它描述了基本过程。