getImage.swift

let getImage = {[unowned self](data: NSData!, response: NSURLResponse!, error: NSError!) -> Void in
    let sizeOrder = ["Large", "Medium 800", "Medium 640"]
    var largestImgUrl: String?

    let json = JSON(data: data)
    for (index: String, subJson: JSON) in json["sizes"]["size"] {
        for size in sizeOrder {
            if (subJson["label"].string == size) {
                largestImgUrl = subJson["source"].string
                break
            }
        }
    }

    let photoUrl = NSURL(string: largestImgUrl!)

    var manager: SDWebImageManager = SDWebImageManager.sharedManager()
    manager.downloadImageWithURL(
        photoUrl,
        options: SDWebImageOptions.ProgressiveDownload,
        progress: nil)
        {[unowned self](
            cellImage: UIImage!,
            error: NSError!,
            cacheType: SDImageCacheType,
            finished: Bool,
            imageUrl: NSURL!) -> Void in

            self.photoView?.image = cellImage
    }
}