Swift 3 : URL Image makes UITableView scroll slow issue

Question

I have an extension to print image URL on UIImageView. But I think the problem is my tableView is so slow because of this extension. I think I need

Answer 1

Your tableview slow because you load data in current thread which is main thread. You should load data other thread then set image in main thread (Because all UI jobs must be done in main thread). You do not need to use third party library for this just change your extension with this:

extension UIImageView{
func setImageFromURl(stringImageUrl url: String){
    if let url = NSURL(string: url) {
        DispatchQueue.global(qos: .default).async{
            if let data = NSData(contentsOf: url as URL) {
                DispatchQueue.main.async {
                    self.image = UIImage(data: data as Data)
                }
            }
        }
    }
 }
}