DispatchAfterTime.swift

        /** 
         Telling the system to dispatch after 2 seconds on the main queue
         */
        let dispatchTime = dispatch_time(DISPATCH_TIME_NOW, Int64(2.00 * Double(NSEC_PER_SEC)))
        
        dispatch_after(dispatchTime, dispatch_get_main_queue()) { [weak self] in
            guard let strongSelf = self, let aProperty = aProperty else {
                return
            }
            // Do something with aProperty
            }
        }