iPhone MKMapView - MKPolygon Issues

Question

I am trying to plot a MKPolygon on a MKMapView in iOS 4.0. I have an NSArray which contains custom objects that include properties for latitude/longitude. I have a code samp

Answer 1

Code in Swift 4

For coordinates in json:

{
"coordinates": [
    [-73.947676,40.660297],
    [-73.947264,40.656437],
    [-73.947159,40.655594],
    [-73.946479,40.6491],
    [-73.947467,40.649039]
}

Read the coordinates:

let coordinates = json["coordinates"] as! [[Double]] 

Create points array:

var locationCoordinates = [CLLocationCoordinate2D]()    
for coordinate in coordinates{
   locationCoordinates.append(CLLocationCoordinate2DMake(coordinate.last!, coordinate.first!))
}

Create a polygon and add it to the map:

map.addOverlay(MKPolyline(coordinates: locationCoordinates, 
                                count: locationCoordinates.count))

Make sure your VC confronts to MKMapViewDelegate

class ViewController: UIViewController, MKMapViewDelegate { ... }

And add this method:

func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
    if overlay is MKPolygon {
        let polygonView = MKPolygonRenderer(overlay: overlay)
        polygonView.fillColor = .black
        polygonView.strokeColor = .red
        polygonView.lineWidth = 2.0

        return polygonView

    return MKOverlayRenderer()
}