TTCalloutView
@protocol TTCalloutView <NSObject>
TTCalloutView base protocol fro view displays additional information.
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When callout is attached to map either to annotation or any other displayable object provides coordinates anchor point. If callout is not attached to map is kCLLocationCoordinate2DInvalid
Declaration
Objective-C
@optional @property (assign, readwrite, nonatomic) CLLocationCoordinate2D coordinate;
Swift
optional var coordinate: CLLocationCoordinate2D { get set }