How to know whether MKMapView visibleMapRect contains a Coordinate?

Question

If I have a MKMapView and a CLLocationCoordinate2D how do you test whether the map\'s visible area contains the coordinate?

Answer 1

Swift 3 compatible

If you frequently work with maps I suggest you to create an extension like this:

extension MKMapView {
    
    func contains(coordinate: CLLocationCoordinate2D) -> Bool {
        return MKMapRectContainsPoint(self.visibleMapRect, MKMapPointForCoordinate(coordinate))
    }
    
}

Then you can use wherever, for example:

func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
    if mapView.contains(coordinate: mapView.centerCoordinate) {
       // do stuff
    }
}

In this way you keep the code:

• more maintainable: if Apple decide to change its frameworks you will able to do a fast refactor changing code in a single point
• more testable
• more readable and clean