Half Lat/Long Delta with No Extension Necessary

Question

I'm attempting to consolidate what I currently have as an extension into my struct MapView.

 extension MKCoordinateRegion {

    var boundingBoxCoordinates: [CLLocationCoordinate2D] {
        let halfLatDelta = self.span.latitudeDelta / 2
        let halfLngDelta = self.span.longitudeDelta / 2

Answer 1

I'm not sure if I understand your question correctly but I think the problem is here: self.span in MKCoordinateRegion extension.

extension MKCoordinateRegion {

    static let latitudeDelta: CLLocationDegrees = 1
    static let longitudeDelta: CLLocationDegrees = 1

        var boundingBoxCoordinates: [CLLocationCoordinate2D] {
            let halfLatDelta = MKCoordinateRegion.latitudeDelta / 2
            let halfLngDelta = MKCoordinateRegion.longitudeDelta / 2
            .....
    }
}

If you need to declare them as private static property, add private keyword after static.

Two Swift extension rules to mention here:

1. can't declare stored property. compiler error: Extensions must not contain stored properties
2. can't declare class property. compiler error: Class properties are only allowed within classes; use 'static' to declare a static property (like I used in answer code block)