我正在尝试从Swift 1.2更改为Swift 2.0，而我在更改的最后。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（红点）。
这是我的代码，希望您能提供一些帮助，因为我认为一切都很好，但仍然无法正常工作：
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。
接受的答案无效，因为它尚未annotationView在else块中初始化。
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：
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
}
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我来说两句