Centering MKMapView on spot N-pixels below pin

Question

Want to center MKMapView on a point N-pixels below a given pin (which may or may not be visible in the current MapRect).

I\'ve been trying

Answer 1

For Swift:

import MapKit

extension MKMapView {

func moveCenterByOffSet(offSet: CGPoint, coordinate: CLLocationCoordinate2D) {
    var point = self.convert(coordinate, toPointTo: self)

    point.x += offSet.x
    point.y += offSet.y

    let center = self.convert(point, toCoordinateFrom: self)
    self.setCenter(center, animated: true)
}

func centerCoordinateByOffSet(offSet: CGPoint) -> CLLocationCoordinate2D {
    var point = self.center

    point.x += offSet.x
    point.y += offSet.y

    return self.convert(point, toCoordinateFrom: self)
}
}