In my application I have a map that shows your points with some different images. When I make some changes in some parameter that is used to define the image I try to update the map by removing and adding the notations. The problem is that when I update the annotations and add them again the method viewFor annotation receives the annotation as nil. What can I be doing wrong?
Here I am updating my map after making the changes:
func reloadMap(){
for annotation in mapView.annotations {
let a = annotation
self.mapView.removeAnnotation(a)
DispatchQueue.main.async {
self.mapView.addAnnotation(a)
}
}
}
This is my viewForAnnotation that I use to set the annotation image:
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let annotationIdentifier = "pin"
var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: annotationIdentifier)
if annotationView == nil {
annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)
annotationView?.canShowCallout = true
var categoryName = ""
var colorName = ""
// Resize image
if annotation is MyAnnotation{
let index = (annotation as! MyAnnotation).annotationIndex
let annotationData = searchResult[index]
let categories = annotationData.object(forKey: "category") as! NSArray
for item in categories {
let category = item as! String
if hasCategory(category: category) {
categoryName = translateCategoryName(category: category)
break
}
}
let status = annotationData.object(forKey: "status") as! String
if status == "Lotado"{
colorName = "vermelho"
} else if status == "Quase cheio"{
colorName = "laranja"
} else if status == "Médio"{
colorName = "amarelo"
}else if status == "Vazio"{
colorName = "verde"
} else {
colorName = "cinza"
}
}
var imageName = ""
if categoryName != "" {
imageName = "\(colorName)-\(categoryName)"
} else {
imageName = "verde-padaria"
}
if annotation is MKUserLocation {
let userAvatar = defaults.integer(forKey: "avatarNumber")
imageName = "balao-avatar\(userAvatar)"
}
let pinImage = UIImage(named: imageName)
let size = CGSize(width: 30, height: 50)
UIGraphicsBeginImageContext(size)
pinImage?.draw(in: CGRect.init(x: 0.0, y: 0.0, width: size.width, height: size.height))
let resizedImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
annotationView?.image = resizedImage
if !(annotation is MKUserLocation) {
let btn = UIButton(type: .infoLight)
btn.addTarget(self,action:#selector(showEstablishment),for:.touchUpInside)
annotationView?.rightCalloutAccessoryView = btn
}
return annotationView
}
else {
annotationView?.annotation = annotation
}
return annotationView
}
