From core data I generate data for map marker pins. When user selects a marker pin I display the data in a popup label with multiple rows, when I click on the pin. This is working for one marker pin. Now, I need to iterate over a list and generate several of those markers each with unique popup label data. The code:
struct MapView: UIViewRepresentable {
var annotationOnTap: (_ title: String) -> Void
@Binding var pins: [GpsData.MyEndPt]
let key: String
private static var mapViewStore = [String : MKMapView]()
func makeUIView(context: Context) -> MKMapView {
if let mapView = MapView.mapViewStore[key] {
mapView.delegate = context.coordinator
return mapView
}
let mapView = MKMapView(frame: .zero)
mapView.delegate = context.coordinator
MapView.mapViewStore[key] = mapView
return mapView
}
func updateUIView(_ uiView: MKMapView, context: Context) {
uiView.addAnnotations(pins)
}
func makeCoordinator() -> MapCoordinator {
MapCoordinator(self)
}
final class MapCoordinator: NSObject, MKMapViewDelegate {
var parent: MapView
init(_ parent: MapView) {
self.parent = parent
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let PINID:String = "MyEndPoint"
var mPin: MKMarkerAnnotationView? = nil
let subtitleView = UILabel()
subtitleView.font = subtitleView.font.withSize(12)
subtitleView.numberOfLines = 0
if (mPin == nil ) {
mPin = MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: PINID)
mPin?.canShowCallout = true
} else{
mPin?.annotation = annotation
}
mPin?.leftCalloutAccessoryView = nil
let btn = UIButton(type: .detailDisclosure)
mPin?.rightCalloutAccessoryView = btn
let zip:String = "77065"
let formattedSalesStr:String = "100"
let totalTargetText:String = "500"
let paddedLoad = formattedSalesStr.padding(toLength: 50, withPad: " ", startingAt: 0)
let paddedCapacity = totalTargetText.padding(toLength: 50, withPad: " ", startingAt: 0)
subtitleView.text = "Total sales: "
subtitleView.text! += paddedLoad
subtitleView.text! += " \r\n"
subtitleView.text! += "Total Target: "
subtitleView.text! += paddedCapacity
subtitleView.text! += " \r\n"
subtitleView.text! += paddedzip
mPin!.detailCalloutAccessoryView = subtitleView
return mPin!
}
}
}
As you can see in the above method I have hardcoded values for my popup marker label. So I tried to iterate over the @Binding pins, populate each mPin, and return an array of MKAnnotationView, like this:
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> [MKAnnotationView] {
let PINID:String = "MyEndPoint"
var i:Int = 1
var mPins = [MKAnnotationView]()
for detail in self.parent.pins {
var mPin: MKMarkerAnnotationView? = nil
let subtitleView = UILabel()
subtitleView.font = subtitleView.font.withSize(12)
subtitleView.numberOfLines = 0
if (mPin == nil ) {
mPin = MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: PINID)
mPin?.canShowCallout = true
} else{
mPin?.annotation = annotation
}
mPin?.leftCalloutAccessoryView = nil
let btn = UIButton(type: .detailDisclosure)
mPin?.rightCalloutAccessoryView = btn
subtitleView.text! += String(i)
subtitleView.text = "Total Load: "
subtitleView.text! += String(detail.sales)
subtitleView.text! += " \r\n"
subtitleView.text! += "Total Target: "
subtitleView.text! += String(detail.target)
subtitleView.text! += " \r\n"
i += 1
// }
mPin!.detailCalloutAccessoryView = subtitleView
mPins.append(mPin!)
}
return mPins
}
The marker pins show up, but then the label does not popup. How to fix this?
