ARKit & CoreLocation + POI + MapKit + Directions

poi_directions.swift

func getRouteSegments(startCoordinate: CLLocationCoordinate2D, endCoordinate: CLLocationCoordinate2D) {
    // Request the walking directions between the two points
    let directionRequest = setupRouteDirectionsRequest(startCoordinate: startCoordinate, endCoordinate: endCoordinate)
    let directions = MKDirections(request: directionRequest)
    directions.calculate {
        (response, error) -> Void in

        guard let response = response else {
            if let error = error {
                print("Error: \(error)")
                // TODO: handle error
            }
            return
        }

        // add route segments to AR Scene
        self.manageRouteDirections(response)
    }
}

func manageRouteDirections(_ response: MKDirections.Response) {
    for route in response.routes {

        // add route coordinates together so we can build our AR path
        var routeCoordinates = [CLLocationCoordinate2D]()
        for step in route.steps {

            let pointCount = step.polyline.pointCount
            let stepCoordinates = UnsafeMutablePointer<CLLocationCoordinate2D>.allocate(capacity: pointCount)
            step.polyline.getCoordinates(stepCoordinates, range: NSRange(location: 0, length: pointCount))

            for i in 0..<pointCount {
                routeCoordinates.append(stepCoordinates[i])
            }
        }

        // create and add the route segments to the AR scene
        for i in 0..<routeCoordinates.count-1 {

            let startCoordinate = routeCoordinates[i]
            let endCoordinate = routeCoordinates[i+1]
            let routeSegment = RouteSegment(startLatitude: startCoordinate.latitude, startLongitude: startCoordinate.longitude, startAltitude: 0,
                                            endLatitude: endCoordinate.latitude, endLongitude: endCoordinate.longitude, endAltitude: 0)
            self.addRouteSegmentToARScene(routeSegment)
        }

        // handle destination segment
        let finalStepCoordinate = routeCoordinates[routeCoordinates.count-1]
        let routeSegment = RouteSegment(startLatitude: finalStepCoordinate.latitude, startLongitude: finalStepCoordinate.longitude, startAltitude: 0,
                                        endLatitude: selectedPOI!.latitude, endLongitude: selectedPOI!.longitude, endAltitude: 0)
        self.addFinalRouteSegmentToARScene(routeSegment)
    }
}