在iOS的CommentationView中自定义图钉图像 [英] Custom pin image in annotationView in iOS

问题描述

我正在尝试从Swift 1.2更改为Swift 2.0，而我正处于更改的结尾.目前，我正在MapViewController中进行更改，并且没有任何错误或警告，但是我的图钉(annotationView)的自定义图片未分配给图钉，而是显示了默认图片(红色点).

I'm trying to change from Swift 1.2 to Swift 2.0 and I'm at the end of the changes. Currently I'm making changes in the MapViewController, and there isn't any error or warning, but the custom image for my pin (annotationView) it's not assigned to the pin and it's showing the default one (red dot).

这是我的代码，希望您能提供一些提示，因为我认为一切都很好，但是仍然无法正常工作:

Here is my code, I hope you can help me with some tip because I think everything is fine but it's still not working:

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
}

预先感谢

致谢.

推荐答案

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

The accepted answer doesn't work, as it has annotationView uninitialized in else block.

这是一个更好的解决方案.如果可能，它将使注释视图出队，否则将创建新视图:

Here's a better solution. It dequeues annotation view if possible or creates a new one if not:

快速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
}

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