Without Bridging to ObjectiveC, Can We Get the Coordinates of a Tap Solely in SwiftUI? - mapkit

Question

I have the following code:
struct MyLocationMap: View {
#EnvironmentObject var userData: UserData
#State var annotationArray: [MyAnnotation] = [MyAnnotation(coordinates: CLLocationCoordinate2D(latitude: CurrentLocation().coordinates?.latitude ?? CLLocationCoordinate2D().latitude, longitude: CurrentLocation().coordinates?.longitude ?? CLLocationCoordinate2D().longitude), type: .waypoint)]
var body: some View {
MakeMapView(annotationArray: annotationArray)
.gesture(
LongPressGesture(minimumDuration: 1)
.onEnded { _ in
print("MapView pressed!\n--------------------------------------\n")
//Handle press here
})
}
}
import SwiftUI
import CoreLocation
import MapKit
struct MakeMapView : UIViewRepresentable {
typealias UIViewType = MKMapView
let annotationArray: [MyAnnotation]?
func makeUIView(context: UIViewRepresentableContext<MakeMapView>) -> MKMapView{
MKMapView()
}
func updateUIView(_ mapView: MKMapView, context: Context) {
mapView.showsUserLocation = true
if let coordinates = CurrentLocation().coordinates {
// updateAnnotations(from: mapView)
DispatchQueue.main.asyncAfter(deadline: .now() + 1.0, execute: {
mapView.showsUserLocation = true
mapView.showsCompass = true
mapView.showsScale = true
mapView.mapType = .satellite
let span = MKCoordinateSpan(latitudeDelta: 0.002, longitudeDelta: 0.002)
let region = MKCoordinateRegion(center: coordinates, span: span)
mapView.setRegion(region, animated: true)
})
}
}
What I am having trouble with is implementing func convert(_ point: CGPoint, toCoordinateFrom view: UIView?) -> CLLocationCoordinate2D to obtain the lat/lon of the gesture solely using SwiftUI/Combine. Is it possible? If not, can I implement it with what I have?
I have reviewed the post at
How to handle touch gestures in SwiftUI in Swift UIKit Map component?
and
Add single pin to Mapkit with SwiftUI
Once I have the coordinates, dropping the pin is straightforward, but I can't wrap my head around getting the coordinates.
Thanks.

Answer 1

A DragGesture with no minimumDistance activates immediately and has location and startLocation in its onChanged listener, you can use that to grab location like so:
struct GesturesView: View {
#State private var location: CGPoint = .zero
var body: some View {
let drag = DragGesture(minimumDistance: 0).onChanged {
self.location = $0.startLocation
}
let longPress = LongPressGesture().onEnded { _ in
self.doSomething(with: self.location)
}
let gesture = longPress.simultaneously(with: drag)
return Rectangle()
.frame(width: 300, height: 300)
.padding()
.gesture(gesture)
}
func doSomething(with location: CGPoint) {
print("Pressed at", location)
}
}