Dat Collection View

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! ImageCell
        
        for imageURL in self.imageURLs {
            let URL = NSURL(string: imageURL as! String)!
            cell.imageView.af_setImageWithURL(URL)
        }
        activityIndicator.stopAnimating()
        return cell
    }
    
    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.imageURLs.count
    }