loading tableView images asynchronously in swift

Question

My code download images from the web and sets them as a tableView cell imageView. It works fine except that I need to tap on a cell for it to refresh the cell\'s content and

Answer 1

Use the following class:

class ImageLoadingWithCache {

    var imageCache = [String:UIImage]()

    func getImage(url: String, imageView: UIImageView, defaultImage: String) {
        if let img = imageCache[url] {
            imageView.image = img
        } else {
            let request: NSURLRequest = NSURLRequest(URL: NSURL(string: url)!)
            let mainQueue = NSOperationQueue.mainQueue()

            NSURLConnection.sendAsynchronousRequest(request, queue: mainQueue, completionHandler: { (response, data, error) -> Void in
                if error == nil {
                    let image = UIImage(data: data)
                    self.imageCache[url] = image

                    dispatch_async(dispatch_get_main_queue(), {
                        imageView.image = image
                    })
                }
                else {
                    imageView.image = UIImage(named: defaultImage)
                }
            })
        }
    }
}

Usage:

var cache = ImageLoadingWithCache()
cache.getImage(YOUR_URL, imageView: YOUR_IMAGEVIEW, defaultImage: "DEFAULT_IMAGE_NAME")