Get first frame of gif

UIImage+gif.swift

extension UIImage {
    // first frame of gif
    class func firstFrame(gif url: URL) -> UIImage? {
        guard let data = try? Data(contentsOf: url) as CFData else {
            return nil
        }
        guard let source = CGImageSourceCreateWithData(data, nil) else {
            return nil
        }
        guard let cgimage = CGImageSourceCreateImageAtIndex(source, 0, nil) else {
            return nil
        }
        let image = UIImage(cgImage: cgimage)
        return image
    }
}