Detecting touches on MKOverlay in iOS7 (MKOverlayRenderer)

Question

I have an MKMapView with possibly hundreds of polygons drawn. Using MKPolygon and MKPolygonRenderer as one is suppose to on iOS7.

What I need is a way of acting upon

Answer 1

Based on @davidrynn answer i've accomplished a more dynamic and updated result.

Swift 5

Subclass MKMapView:

public class MapView: MKMapView {

public var mapViewProtocol: MapViewProtocol?

public override func touchesEnded(_ touches: Set, with event: UIEvent?) {

    if let touch = touches.first {

        if touch.tapCount == 1 {

            let touchLocation: CGPoint = touch.location(in: self)
            let locationCoordinate: CLLocationCoordinate2D = self.convert(touchLocation, toCoordinateFrom: self)

            var mkCircleList: [MKCircle] = self.overlays.compactMap { $0 as? MKCircle }
            mkCircleList = mkCircleList.filter { $0.contains(locationCoordinate) }
            if !mkCircleList.isEmpty {

                self.mapViewProtocol?.didTapMKCircles(self, mkCircleList)
            }

            var mkMultiPolygonList: [MKMultiPolygon] = self.overlays.compactMap { $0 as? MKMultiPolygon }
            mkMultiPolygonList = mkMultiPolygonList.filter { $0.contains(locationCoordinate) }
            if !mkMultiPolygonList.isEmpty {

                self.mapViewProtocol?.didTapMKMultiPolygons(self, mkMultiPolygonList)
            }

            var mkPolygonList: [MKPolygon] = self.overlays.compactMap { $0 as? MKPolygon }
            mkPolygonList = mkPolygonList.filter { $0.contains(locationCoordinate) }
            if !mkPolygonList.isEmpty {

                self.mapViewProtocol?.didTapMKPolygons(self, mkPolygonList)
            }

            var mkMultiPolylineList: [MKMultiPolyline] = self.overlays.compactMap { $0 as? MKMultiPolyline }
            mkMultiPolylineList = mkMultiPolylineList.filter { $0.contains(locationCoordinate) }
            if !mkMultiPolylineList.isEmpty {

                self.mapViewProtocol?.didTapMKMultiPolylines(self, mkMultiPolylineList)
            }

            var mkPolylineList: [MKPolyline] = self.overlays.compactMap { $0 as? MKPolyline }
            mkPolylineList = mkPolylineList.filter { $0.contains(locationCoordinate) }
            if !mkPolylineList.isEmpty {

                self.mapViewProtocol?.didTapMKPolylines(self, mkPolylineList)
            }

            //TODO
            //var mkTileOverlayList: [MKTileOverlay] = self.overlays.compactMap { $0 as? MKTileOverlay }
            //mkTileOverlayList = mkTileOverlayList.filter { $0.contains(locationCoordinate) }


            self.mapViewProtocol?.didTapMap(self, locationCoordinate)
        }
    }

    super.touchesEnded(touches, with: event)
}

}

After that i created multiple extensions for each mkOverlay type:

MKKCircle

import Foundation
import MapKit

extension MKCircle {

    func contains(_ coordinate2D: CLLocationCoordinate2D) -> Bool {

        let renderer = MKCircleRenderer(circle: self)
        let currentMapPoint: MKMapPoint = MKMapPoint(coordinate)
        let viewPoint: CGPoint = renderer.point(for: currentMapPoint)
        if renderer.path == nil {

            return false
        } else {

            return renderer.path.contains(viewPoint)
        }
    }
}

MKMultiPolygon

import Foundation
import MapKit

@available(iOS 13.0, *)
extension MKMultiPolygon {

    func contains(_ coordinate2D: CLLocationCoordinate2D) -> Bool {

        return self.polygons.filter { $0.contains(coordinate2D) }.isEmpty ? false : true
    }
}

MKMultiPolyline

    import Foundation
import MapKit

@available(iOS 13.0, *)
extension MKMultiPolyline {

    func contains(_ coordinate2D: CLLocationCoordinate2D) -> Bool {

        return self.polylines.filter { $0.contains(coordinate2D) }.isEmpty ? false : true
    }
}

MKPolygon

import Foundation
import MapKit

extension MKPolygon {

    func contains(_ coordinate2D: CLLocationCoordinate2D) -> Bool {

        let renderer = MKPolygonRenderer(polygon: self)
        let currentMapPoint: MKMapPoint = MKMapPoint(coordinate2D)
        let viewPoint: CGPoint = renderer.point(for: currentMapPoint)
        if renderer.path == nil {

            return false
        } else {

            return renderer.path.contains(viewPoint)
        }
    }
}

MKPolyline

import Foundation
import MapKit

extension MKPolyline {

    func contains(_ coordinate2D: CLLocationCoordinate2D) -> Bool {

        let renderer = MKPolylineRenderer(polyline: self)
        let currentMapPoint: MKMapPoint = MKMapPoint(coordinate2D)
        let viewPoint: CGPoint = renderer.point(for: currentMapPoint)
        if renderer.path == nil {

            return false
        } else {

            return renderer.path.contains(viewPoint)
        }
    }
}

And finally create and implement the protocol:

    public protocol MapViewProtocol {

    func didTapMKPolygons(_ mapView: MKMapView, _ mkPolygons: [MKPolygon])

    func didTapMKCircles(_ mapView: MKMapView, _ mkCircles: [MKCircle])

    func didTapMKPolylines(_ mapView: MKMapView, _ mkPolylines: [MKPolyline])

    func didTapMKMultiPolygons(_ mapView: MKMapView, _ mkMultiPolygons: [MKMultiPolygon])

    func didTapMKMultiPolylines(_ mapView: MKMapView, _ mkMultiPolylines: [MKMultiPolyline])

    func didTapMap(_ mapView: MKMapView, _ clLocationCoordinate2D: CLLocationCoordinate2D)
}