         return false
     }
 }
-
-private var currentDownloadID: String?

        static var ImageDownloaderKey = "af_UIImageView.ImageDownloader"
        static var SharedImageDownloaderKey = "af_UIImageView.SharedImageDownloader"
        static var ActiveRequestReceiptKey = "af_UIImageView.ActiveRequestReceipt"
    }

    // MARK: - Properties

        get {
            return objc_getAssociatedObject(self, &AssociatedKeys.ActiveRequestReceiptKey) as? RequestReceipt
        }
        set(receipt) {
            objc_setAssociatedObject(self, &AssociatedKeys.ActiveRequestReceiptKey, receipt, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }

    var af_activeDownloadID: String? {
        get {
            return objc_getAssociatedObject(self, &AssociatedKeys.ActiveDownloadIDKey) as? String
        }
        set(downloadID) {
            objc_setAssociatedObject(self, &AssociatedKeys.ActiveDownloadIDKey, downloadID, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }

