How to set image for UIImageView in UITableViewCell in SWIFT

Question

How to set image for UIImageView in UITableViewCell Asynchronously for each cell.

Answer 1

To set image asynchronously in UITableViewCell.

// Check our image cache for the existing key. This is just a dictionary of UIImages
    //var image: UIImage? = self.imageCache.valueForKey(urlString) as? UIImage
    var image = self.imageCache[urlString]


    if( image == nil ) {
        // If the image does not exist, we need to download it
        var imgURL: NSURL = NSURL(string: urlString)

        // Download an NSData representation of the image at the URL
        let request: NSURLRequest = NSURLRequest(URL: imgURL)
        NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler: {(response: NSURLResponse!,data: NSData!,error: NSError!) -> Void in
            if error == nil {
                image = UIImage(data: data)

                // Store the image in to our cache
                self.imageCache[urlString] = image
                if let cellToUpdate = tableView.cellForRowAtIndexPath(indexPath) {
                    cellToUpdate.imageView.image = image
                }
            }
            else {
                println("Error: \(error.localizedDescription)")
            }
        })

    }
    else {
        dispatch_async(dispatch_get_main_queue(), {
            if let cellToUpdate = tableView.cellForRowAtIndexPath(indexPath) {
                cellToUpdate.imageView.image = image
            }
        })
    }