swift2 - Swift 2 - User's Current Location is inside MKPolygon -

i trying check if user's current location inside mkpolygon. have created following function returns false test cases. there might doing wrong?

func iscorrectregion(coordinates: array<json>, userlocation: cllocationcoordinate2d) -> bool {     var newcoordinates: [cllocationcoordinate2d] = []     var mappoints: [mkmappoint] = []      for(a):(json) in coordinates {         let lat = a.arrayvalue[1].double         let long = a.arrayvalue[0].double         let location = cllocationcoordinate2d(latitude: lat!, longitude: long!)         newcoordinates.append(location)     }      b in newcoordinates {         let c: mkmappoint = mkmappointforcoordinate(b)         mappoints.append(c)     }      let polygon: mkpolygon = mkpolygon(points: &mappoints, count: mappoints.count)     let polyrender: mkpolygonrenderer = mkpolygonrenderer(polygon: polygon)     polyrender.invalidatepath()     let target: mkmappoint = mkmappointforcoordinate(userlocation)     let cgtarget: cgpoint = cgpoint(x: target.x, y: target.y)     let iswithin = cgpathcontainspoint(polyrender.path, nil, cgtarget, false)      return iswithin } 

finally figured out after trying few different things. hope helps others:

func iscorrectregion(coordinates: array<json>, userlocation: cllocationcoordinate2d) -> bool {     var newcoordinates: [cllocationcoordinate2d] = []     var mappoints: [mkmappoint] = []     let mpr: cgmutablepathref = cgpathcreatemutable()      for(a):(json) in coordinates {         let lat = a.arrayvalue[1].double         let long = a.arrayvalue[0].double         let location = cllocationcoordinate2d(latitude: lat!, longitude: long!)         newcoordinates.append(location)     }      b in newcoordinates {         let c: mkmappoint = mkmappointforcoordinate(b)         mappoints.append(c)     }      var p = 0; p<mappoints.count; p++ {         if p == 0 {             cgpathmovetopoint(mpr, nil, cgfloat(mappoints[p].x), cgfloat(mappoints[p].y))         } else {             cgpathaddlinetopoint(mpr, nil, cgfloat(mappoints[p].x), cgfloat(mappoints[p].y))         }     }      let target: mkmappoint = mkmappointforcoordinate(userlocation)     let cgtarget: cgpoint = cgpoint(x: target.x, y: target.y)     let iswithin = cgpathcontainspoint(mpr, nil, cgtarget, false)      return iswithin }