Compiler Error: Invalid Library File - Corelocation

MapKit: Route not being displayed between two annotations

You've almost got it.

The one issue that you need to resolve is the use of the MKMapView delegate functions.

The easiest way to do that is to subclass MKMapView and make your own map view that has conforms to MKMapViewDelegate.

Firstly, create your own map view, subclassing MKMapView and conforming to MKMapViewDelegate. At the moment you're only really using the rendererFor overlay delegate method so I'll just implement that, but you can add other methods if you require them.

class WrappableMapView: MKMapView, MKMapViewDelegate {

    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        let renderer = MKPolylineRenderer(overlay: overlay)
        renderer.strokeColor = .red
        renderer.lineWidth = 4.0
        return renderer
    }
}

Then you need to update your UIViewRepresentable to use the new WrappableMapView that you just created. I have gone for making a functional example, so here I am passing in the request and destination locations. You can handle this how you want but at least this will give you something that works.

struct MyMapView: UIViewRepresentable {

    @Binding var requestLocation: CLLocationCoordinate2D
    @Binding var destinationLocation: CLLocationCoordinate2D

    private let mapView = WrappableMapView()

    func makeUIView(context: UIViewRepresentableContext<MyMapView>) -> WrappableMapView {
        mapView.delegate = mapView // make sure we set our delegate to be the mapView we just created
        return mapView
    }

    func updateUIView(_ uiView: WrappableMapView, context: UIViewRepresentableContext<MyMapView>) {

        let requestAnnotation = MKPointAnnotation()
        requestAnnotation.coordinate = requestLocation
        requestAnnotation.title = "Package Title"
        uiView.addAnnotation(requestAnnotation)

        let destinationAnnotation = MKPointAnnotation()
        destinationAnnotation.coordinate = destinationLocation
        destinationAnnotation.title = "Destination"
        uiView.addAnnotation(destinationAnnotation)

        let requestPlacemark = MKPlacemark(coordinate: requestLocation)
        let destinationPlacemark = MKPlacemark(coordinate: destinationLocation)

        let directionRequest = MKDirections.Request()
        directionRequest.source = MKMapItem(placemark: requestPlacemark)
        directionRequest.destination = MKMapItem(placemark: destinationPlacemark)
        directionRequest.transportType = .automobile

        let directions = MKDirections(request: directionRequest)
        directions.calculate { response, error in
            guard let response = response else { return }

            let route = response.routes[0]
            uiView.addOverlay(route.polyline, level: .aboveRoads)

            let rect = route.polyline.boundingMapRect
            uiView.setRegion(MKCoordinateRegion(rect), animated: true)

            // if you want insets use this instead of setRegion
            //  uiView.setVisibleMapRect(rect, edgePadding: .init(top: 50.0, left: 50.0, bottom: 50.0, right: 50.0), animated: true)
        }

    }
}

Finally we can put it all together with a ContentView that shows it works:

struct ContentView: View {

    @State var requestLocation = CLLocationCoordinate2D(latitude: 51.509865, longitude:  -0.118092)
    @State var destinationLocation = CLLocationCoordinate2D(latitude: 51.501266, longitude: -0.093210)

    var body: some View {
        MyMapView(requestLocation: $requestLocation, destinationLocation: $destinationLocation)
    }
}

This is what it should look like:

One thing to note, using the rendererFor overlay delegate function in the simulator causes an error. This only happens in the simulator and not on device, so don't be surprised if you see an error message like this in the console.

2019-11-08 18:50:30.034066+0000 StackOverflow[80354:9526181] Compiler error: Invalid library file

Error when using MKMapView

Just ran into this:

Simple Fix: Make sure to check the box for "shows user location" for the MapView in interface builder.

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