Swift handle did select on multiple annotations on same location - swift

Question

I'm trying to call a function when annotations of the same location are selected. All I'm aiming for is to call a function and show a view controller with the two restaurants but for some reason, the function below isn't being called when I selected the marker in the image. (It works fine for single annotations). Thanks for any help.
func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
guard let anno = view.annotation as? MyAnno else { return }
print(anno.post)
}

Answer 1

The problem lies in your guard statement. As I could find out in a short research, iOS uses a MKClusterAnnotation type for annotations that are equally located. Thus, the view variable does not have a .annotation set that confirms to your custom subclass.
In this case you need to try to cast it to a MKClusterAnnotation object, which in return has a property .memberAnnotations of type [MKAnnotation], which is what you want.
I think your code should look something like this (haven't tested it though):
func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
if let anno = view.annotation as? MyAnno {
print("Single Annotation selected:")
print(anno.post)
// do anything
return
}
if let anno = view.annotation as? MKClusterAnnotations {
let selection: [MKAnnotation] = anno.memberAnnotations
print("\(selection.count) Annotations selected:")
// do something with your annotation group
// you should now also be able to cast to your MyAnno class again
for item in selection {
if let myAnno = item as? MyAnno {
print(myAnno.post)
}
}
}
}
For further information also take a look at Decluttering a Map with MapKit Annotation Clustering.