How to check if MKCoordinateRegion contains CLLocationCoordinate2D without using MKMapView?

Question

I need to check if user location belongs to the MKCoordinateRegion. I was surprised not to find simple function for this, something like: CGRectContainsCGPoint(rect,

Answer 1

Based on Lukasz solution, but in Swift, in case anybody can make use of Swift:

func isInRegion (region : MKCoordinateRegion, coordinate : CLLocationCoordinate2D) -> Bool {

    let center   = region.center;
    let northWestCorner = CLLocationCoordinate2D(latitude: center.latitude  - (region.span.latitudeDelta  / 2.0), longitude: center.longitude - (region.span.longitudeDelta / 2.0))
    let southEastCorner = CLLocationCoordinate2D(latitude: center.latitude  + (region.span.latitudeDelta  / 2.0), longitude: center.longitude + (region.span.longitudeDelta / 2.0))

    return (
        coordinate.latitude  >= northWestCorner.latitude &&
        coordinate.latitude  <= southEastCorner.latitude &&

        coordinate.longitude >= northWestCorner.longitude &&
        coordinate.longitude <= southEastCorner.longitude
    )
}