Code for the NSCoding Protocol

class Gif: NSObject, NSCoding {
	let url: NSURL
	let videoURL: NSURL
	let caption: String?
	let gitImage: UIImage
	var gifData: NSData?

	init(url: NSURL, videoURL: NSURL, caption: String?){
		self.url = url
		self.videoURL = videoURL
		self.caption = caption
		self.gifImage = UIImage.gifWithURL(url.absoluteString)!
		self.gifData = nil
	}

	required init?(coder decoder: NSCoder){
		self.url = decoder.decodeObjectForKey("url") as! NSURL
		self.videoURL = decoder.decodeObjectForKey("videoURL") as! NSURL
		self.caption = decoder.decodeObjectForKey("caption") as? String
		self.gifImage = decoder.decodeObjectForKey("gifImage") as! UIImage
		self.gifData = decoder.decodeObjectForKey("gifData") as? NSData
	}

	func encodeWithCoder(coder: NSCoder){
		coder.encodeObject(self.url, forKey: "url")
		coder.encodeObject(self.videoURL, forKey: "videoURL")
		coder.encodeObject(self.caption, forKey: "caption")
		coder.encodeObject(self.gifImage, forKey: "gifImage")
		coder.encodeObject(self.gifData, forKey:"gifData")
	}
}

create the file path

var gifsFilePath: String {
	let directories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
	let documentsPath = directories[0]
	let gifsPath = documentsPath.stringByAppendingString("/savedGifs")
	return gifsPath
}

var gif: Gif?
@IBOutlet weakl var gifImageView: UIImageView!

override func viewDidLoad(){
	super.viewDidLoad()
	gifImageView.image = gif?.gifImage
}

@IBAction func sharedGif(sendr: UIButton){
	var itemsToShare = [NSData]()
	itemsToShare.append((self.gif?gifData)!)

	let activityVC = UIActivityViewController(activityItems: itemsToShare, applicationActivities: nil)
	activityVC.completionWithItemsHandler = {(activity, comleted, items, error) in:
		if (completed){
			self.dismissViewControllerAnimated(true, completion: nil)
		}
	}
	presentViewController(activityVC, animated: true, completion:nil)
}