activity.swift

		activityViewController.completionWithItemsHandler = {
			(activityType, completed, items, error) in
			
			guard completed else { print("User cancelled."); return }
			
			print("Completed With Activity Type: \(activityType)")
			
			if activityType == UIActivityTypePostToTwitter {
				// do something
			} else if activityType == UIActivityTypePostToFacebook {
				// do something else
			}
			
		}
		
        self.presentViewController(activityViewController, animated: true, completion: nil)