Name an AGSGraphicsOverlay

AGSGraphicsOverlay+Name.swift

extension AGSGraphicsOverlay {
    fileprivate struct AssociatedKeys {
        static var referenceNameKey = "geodev_referenceName"
    }
    
    var referenceName:String? {
        get {
            return objc_getAssociatedObject(self, &AssociatedKeys.referenceNameKey) as? String
        }
        set {
            objc_setAssociatedObject(self, &AssociatedKeys.referenceNameKey, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }
}