快速下载URL并填充uiimageview

Question

I'm having difficulty getting each image of my tableviewcell to show the thumbnail of my blog. the link is valid as i had it print to screen to make sure it works here is the block of code causing my brain aneurysm

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) 

    let blogPost: BlogPost = blogPosts[indexPath.row]
    //cell.textLabel?.text = blogPost.postTitle
    postImageLink = blogPost.postImageLink
    cell.textLabel?.text = blogPost.postImageLink

    if postImageLink != "" && cell.imageView?.image != nil {
        dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {

            cell.imageView?.image =  UIImage(data: NSData(contentsOfURL: NSURL(string:self.postImageLink)!)!)
        }
    } else {
            cell.imageView?.image = UIImage(named: "IMG_0079")
        }



    return cell
}

i set the text label to postimagelink only to ensure it was parsing the correct code for future usage. To be clear the problem is the thumbnails of my blog won't load. Only the preset image incase a thumbnail isn't present..postImageLink is a unique url for each thumbnail that I parsed. (yeah i know i can write a parser but can't solve this problem =(..) any help is appreciated before I throw my laptop off the roof thanks! here is image

-rookieprogrammer

Answer 1

try to make two blocks instead, to retrieve and set the image

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {

    // retrieve image from url
    let image = UIImage(data: NSData(contentsOfURL: NSURL(string:self.postImageLink)!)!)

    dispatch_async(dispatch_get_main_queue(), { Void in
        // set image in main thread
        cell.imageView?.image =  image
    })

}

can read more here

Answer 2

Your code is working. It's just that should be doing it in the main_queue, UI main thread, to edit any UI objects.

dispatch_async(dispatch_get_main_queue()) {
      () -> Void in
  // retrieve image from url
  let image = UIImage(data: NSData(contentsOfURL:NSURL(string:self.postImageLink)!)!)

  cell.imageView?.image =  image
}