CoordinateBounds
public extension CoordinateBounds- 
                  
                  Returns the southern latitude of the bounds. DeclarationSwift var south: CLLocationDegrees { get }
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                  Returns the western longitude of the bounds. DeclarationSwift var west: CLLocationDegrees { get }
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                  Returns the northern latitude of the bounds. DeclarationSwift var north: CLLocationDegrees { get }
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                  Returns the eastern longitude of the bounds. DeclarationSwift var east: CLLocationDegrees { get }
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                  The centerpoint of this CoordinateBoundscalculated by simple interpolation. This is a non-geodesic calculation which is not the geographic center.DeclarationSwift var center: CLLocationCoordinate2D { get }
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                  Returns whether the bounds are empty or not. DeclarationSwift var isEmpty: Bool { get }
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                  The absolute distance, in degrees, between the north and south boundaries of these bounds. One degree of latitude is approximately 111 kilometers (69 miles). DeclarationSwift var latitudeSpan: CLLocationDegrees { get }
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                  The absolute distance, in degrees, between the west and east boundaries of these bounds. The distance represented by a longitude span varies on current latitude. At the equator one degree of longitude represents a distance of approximately 111 kilometers (69 miles). While at the poles one degree of logitude span is 0 kilometers (0 miles). DeclarationSwift var longitudeSpan: CLLocationDegrees { get }
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                  The northwest coordinate of the bounds. DeclarationSwift var northwest: CLLocationCoordinate2D { get }
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                  The southeast coordinate of the bounds. DeclarationSwift var southeast: CLLocationCoordinate2D { get }
 CoordinateBounds Extension Reference
        CoordinateBounds Extension Reference