I have a coordinate region that I have determined contains the limits of what I want to show for my app. I have set this up as an MKCoordinateRegion with center point lat, longitude and a span. How do I determine if the current userLocation is inside of my coordinate region?
How do I determine if the current user location is inside of my MKCoordinateRegion?
3k views Asked by Alan Moore At
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Swift 3 version of firstresponder's answer:
let userPoint = MKMapPointForCoordinate(mapView.userLocation.coordinate)
let mapRect = mapView.visibleMapRect
let inside = MKMapRectContainsPoint(mapRect, userPoint)
Pretty much the same. This API has not been Swift-ified (i.e., updated to conform to the Swift API design guidelines) yet. It really should be...
let userPoint = mapView.userLocation.coordinate.mapPoint
let inside = mapView.visibleMapRect.contains(userPoint)
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There is a simple solution to decide if a point is inside your area if the area is given by a polygon using the ray casting algorithm: See here http://en.wikipedia.org/wiki/Point_in_polygon
As a starting point use a location guaranteed to be outside your region, e.g. (geographic) north pole.
Use map rects. Here's an example using the map's current visible rect. With regards to your question, you could use
convertRegion:toRectToView:
to first convert your region to aMKMapRect
beforehand.