Example for https://ru.stackoverflow.com/questions/1283910

TappableMKMapView.swift

//
//  ContentView.swift
//  TestMapkit
//
//  Created by Volodymyr Andriienko on 20.05.2021.
//  Copyright © 2021 VAndrJ. All rights reserved.
//

import SwiftUI
import MapKit
import CoreLocation

struct ContentView: View {
    @State private var region = MKCoordinateRegion(
        // Apple Park
        center: CLLocationCoordinate2D(latitude: 37.334803, longitude: -122.008965),
        span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01)
    )
    
    @State private var lineCoordinates = [
        // Steve Jobs theatre
        CLLocationCoordinate2D(latitude: 37.330828, longitude: -122.007495),
        // Caffè Macs
        CLLocationCoordinate2D(latitude: 37.336083, longitude: -122.007356),
        // Apple wellness center
        CLLocationCoordinate2D(latitude: 37.336901, longitude:  -122.012345),
    ]
    
    var body: some View {
        MapView(
            region: region,
            lineCoordinates: lineCoordinates,
            onMapTap: { coordinate in
                // Прописать как добавлять / удалять
                lineCoordinates.append(coordinate)
            }
        )
        .edgesIgnoringSafeArea(.all)
    }
}

class TappableMKMapView: MKMapView {
    var onMapTap: ((CLLocationCoordinate2D) -> Void)?
    
    convenience init() {
        self.init(frame: .zero)
        addRecognizer()
    }
    
    private func addRecognizer() {
        let recognizer = UITapGestureRecognizer(target: self, action: #selector(onTap(_:)))
        addGestureRecognizer(recognizer)
    }
    
    @objc private func onTap(_ sender: UITapGestureRecognizer) {
        let location = sender.location(in: self)
        let coordinate = convert(location, toCoordinateFrom: self)
        onMapTap?(coordinate)
    }
}

struct MapView: UIViewRepresentable {
    let region: MKCoordinateRegion
    let lineCoordinates: [CLLocationCoordinate2D]
    let onMapTap: (CLLocationCoordinate2D) -> Void
    
    func makeUIView(context: Context) -> MKMapView {
        let mapView = TappableMKMapView()
        mapView.onMapTap = onMapTap
        mapView.delegate = context.coordinator
        mapView.region = region
        
        let polyline = MKPolyline(coordinates: lineCoordinates, count: lineCoordinates.count)
        mapView.addOverlay(polyline)
        
        return mapView
    }
    
    func updateUIView(_ view: MKMapView, context: Context) {
        let polyline = MKPolyline(coordinates: lineCoordinates, count: lineCoordinates.count)
        view.addOverlay(polyline)
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
}

class Coordinator: NSObject, MKMapViewDelegate {
    var parent: MapView
    
    init(_ parent: MapView) {
        self.parent = parent
    }
    
    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        if let routePolyline = overlay as? MKPolyline {
            let renderer = MKPolylineRenderer(polyline: routePolyline)
            renderer.strokeColor = UIColor.systemBlue
            renderer.lineWidth = 10
            return renderer
        }
        return MKOverlayRenderer()
    }
}