title: how to map JSON object with MapKit using swift
body: <p>I am working with a MapKit example using swift. The JSON object they are using is a object of arrays. I have a JSON file that is a array of objects. from the example I see they are pulling the properties they want by there location in the array. I need to use the property keys in my objects. How do I do this? Very first time with swift. thanks</p>
  
  <p>here are example files</p>
  
  <pre><code> init(title: String, locationName: String, discipline: String, coordinate: CLLocationCoordinate2D) {
  self.title = title
  self.locationName = locationName
  self.discipline = discipline
  self.coordinate = coordinate
  
    super.init()
   }
  
      class func fromJSON(json: [JSONValue]) -&gt; Artwork? {
  // 1
  var title: String
  if let titleOrNil = json[16].string {
    title = titleOrNil
  } else {
    title = ""
  }
  let locationName = json[12].string
  let discipline = json[15].string
  
    // 2
    let latitude = (json[18].string! as NSString).doubleValue
    let longitude = (json[19].string! as NSString).doubleValue
    let coordinate = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
  
     // 3
      return Artwork(title: title, locationName: locationName!, discipline: discipline!, coordinate: coordinate)
    }
  
    var subtitle: String {
     return locationName
   }
  
    // MARK: - MapKit related methods
  
    // pinColor for disciplines: Sculpture, Plaque, Mural, Monument, other
    func pinColor() -&gt; MKPinAnnotationColor  {
     switch discipline {
    case "Sculpture", "Plaque":
     return .Red
   case "Mural", "Monument":
     return .Purple
   default:
     return .Green
   }
    }
  
   // annotation callout opens this mapItem in Maps app
  func mapItem() -&gt; MKMapItem {
  let addressDict = [String(kABPersonAddressStreetKey): self.subtitle]
  let placemark = MKPlacemark(coordinate: self.coordinate, addressDictionary: addressDict)
  
  let mapItem = MKMapItem(placemark: placemark)
  mapItem.name = self.title
  
    return mapItem
  }
  </code></pre>
  
  <p>Snippet of JSON file</p>
  
  <pre><code>  [  
       198,
       "9E5E1F28-22AF-459A-841E-5E89B022505E",
       198,
       1340413921,
       "436621",
       1340413921,
       "436621",
       "{\n}",
       null,
       null,
       "1933",
       "Bronze plaque mounted on a stone with an inscription marking the site of an artesian well. Located along Wilder Avenue near Artesian Way.",
       "1922 Wilder Avenue",
       "http://hiculturearts.pastperfect-online.com/34250images/004/193301-2.JPG",
       "1933.01",
       "Plaque",
       "Site of Honolulu's Pioneer Artesian Well",
       "Full",
       "21.30006",
       "-157.827969",
       [  
          null,
          "21.30006",
          "-157.827969",
          null,
          false
       ],
       null
    ],
  </code></pre>
  
  <p>snippet of JSON file i want to use</p>
  
  <pre><code>{
              "id": "301B2",
              "name": "Wrenhurst",
              "lat": "35.815864",
              "lng": "-78.918893",
              "status": "Act 2Q12",
              "minp": "632000",
              "maxp": "678000",
              "annStarts": "14",
              "annClosings": "0",
              "bldList": "Builder example",
              "vdl": "0",
              "futures": "0",
              "lotSize": "95'",
  </code></pre>