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

Question

I am trying to check if the user's current location is inside the MKPolygon. I have created the following function but it returns false for all my test cases. Is there something I might be 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)
}
for 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
}

Answer 1

Finally figured it out after trying a few different things. Hope this 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)
}
for b in newCoordinates {
let c: MKMapPoint = MKMapPointForCoordinate(b)
mapPoints.append(c)
}
for 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
}