在iOS中的annotationView中自定义图钉图像

Question

我正在尝试从Swift 1.2更改为Swift 2.0,而我正处于更改的末尾.目前我正在对MapViewController进行更改,并且没有任何错误或警告,但我的pin(annotationView)的自定义图像没有分配给引脚,而是显示默认值(红点).

这是我的代码,我希望你能帮助我一些提示,因为我认为一切都很好,但它仍然无法正常工作:

func parseJsonData(data: NSData) -> [Farmacia] {

    let farmacias = [Farmacia]()

    do
    {
        let jsonResult = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers) as? NSDictionary

        // Parse JSON data
        let jsonProductos = jsonResult?["farmacias"] as! [AnyObject]

        for jsonProducto in jsonProductos {

            let farmacia = Farmacia()
            farmacia.id = jsonProducto["id"] as! String
            farmacia.nombre = jsonProducto["nombre"] as! String
            farmacia.location = jsonProducto["location"] as! String

            let geoCoder = CLGeocoder()
            geoCoder.geocodeAddressString(farmacia.location, completionHandler: { placemarks, error in

                if error != nil {
                    print(error)
                    return
                }

                if placemarks != nil && placemarks!.count > 0 {

                    let placemark = placemarks?[0]

                    // Add Annotation
                    let annotation = MKPointAnnotation()
                    annotation.title = farmacia.nombre
                    annotation.subtitle = farmacia.id
                    annotation.coordinate = placemark!.location!.coordinate

                    self.mapView.addAnnotation(annotation)
                }

            })
        }
    }
    catch let parseError {
        print(parseError)
    }

    return farmacias
}

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {

    let identifier = "MyPin"

    if annotation.isKindOfClass(MKUserLocation) {
        return nil
    }

    // Reuse the annotation if possible
    var annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier)

    if annotationView == nil
    {
        annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
        annotationView!.canShowCallout = true
    }

    annotationView!.image = UIImage(named: "custom_pin.png")

    let detailButton: UIButton = UIButton(type: UIButtonType.DetailDisclosure)
    annotationView!.rightCalloutAccessoryView = detailButton

    print(annotationView!.image)

    return annotationView
}

提前致谢,

问候.

Answer 1

接受的答案不起作用,因为它annotationView在else块中未初始化.

这是一个更好的解决方案.如果可能,它会使注释视图出列,或者如果不是,则创建一个新注释视图:

斯威夫特3,4:

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
    // Don't want to show a custom image if the annotation is the user's location.
    guard !(annotation is MKUserLocation) else {
        return nil
    }

    // Better to make this class property
    let annotationIdentifier = "AnnotationIdentifier"

    var annotationView: MKAnnotationView?
    if let dequeuedAnnotationView = mapView.dequeueReusableAnnotationView(withIdentifier: annotationIdentifier) {
        annotationView = dequeuedAnnotationView
        annotationView?.annotation = annotation
    }
    else {
        annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)
        annotationView?.rightCalloutAccessoryView = UIButton(type: .detailDisclosure)
    }

    if let annotationView = annotationView {
        // Configure your annotation view here
        annotationView.canShowCallout = true
        annotationView.image = UIImage(named: "yourImage")
    }

    return annotationView
}

Swift 2.2:

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
    // Don't want to show a custom image if the annotation is the user's location.
    guard !annotation.isKindOfClass(MKUserLocation) else {
        return nil
    }

    let annotationIdentifier = "AnnotationIdentifier"

    var annotationView: MKAnnotationView?
    if let dequeuedAnnotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(annotationIdentifier) {
        annotationView = dequeuedAnnotationView
        annotationView?.annotation = annotation
    }
    else {
        let av = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)
        av.rightCalloutAccessoryView = UIButton(type: .DetailDisclosure)
        annotationView = av
    }

    if let annotationView = annotationView {
        // Configure your annotation view here
        annotationView.canShowCallout = true
        annotationView.image = UIImage(named: "yourImage")
    }

    return annotationView
}

Answer 2

这是答案:

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {

    let identifier = "MyPin"

    if annotation.isKindOfClass(MKUserLocation) {
        return nil
    }

    let detailButton: UIButton = UIButton(type: UIButtonType.DetailDisclosure)

    if let annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier) {
        annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "pin")
        annotationView.canShowCallout = true
        annotationView.image = UIImage(named: "custom_pin.png")
        annotationView.rightCalloutAccessoryView = detailButton
    }
    else {
        annotationView.annotation = annotation
    }

    return annotationView
}

问候