UICollectionView滚动SWIFT时滞/慢

Question

hello I am displaying two images in my CollectionView dynamically. I am using sd_webImage to display the images. The problem is there is lag coming while scrolling the cells. I have googled it and try some solution but still no luck.

This is how I am showing the images

        cell.profileImageView.sd_setImageWithURL(UIImage().absoluteURL(profileImageUrl), placeholderImage: UIImage.init(named: "placeholder_profile_image"))

            cell.productImageView.sd_setImageWithURL(UIImage().absoluteURL(productImageUrl), placeholderImage: UIImage.init(named: "placeholder_product_image"))

I have tried this also

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)) {


            let  profileImageUrl = (((self.dict["\(indexPath.section)"] as?NSDictionary)!["User"] as?NSDictionary)!["profile_image"] as?NSString)

            let productImageUrl = (((self.dict["\(indexPath.item)"] as?NSDictionary)!["Trip"] as?NSDictionary)!["product_image_path"] as?NSString)! as String

   dispatch_async(dispatch_get_main_queue()) {

        cell.profileImageView.sd_setImageWithURL(UIImage().absoluteURL(profileImageUrl), placeholderImage: UIImage.init(named: "placeholder_profile_image"))

                cell.productImageView.sd_setImageWithURL(UIImage().absoluteURL(productImageUrl), placeholderImage: UIImage.init(named: "placeholder_product_image"))
}
}

but still showing lag

Answer 1

使用Time Profiler仪器检测出确切的问题出在哪里。