title: SDWebImage Cancel download
body: <p>I am using SDWebimage to load images on my tablkeview
  I am following <a href="http://iosmadesimple.blogspot.com/2013/04/lazy-image-loading.html" rel="nofollow">this</a> tutorial</p>
  
  <p>Now I stuck on a problem,If I scroll down and hit back before images get loaded the app got crashes.How can I solve this ?</p>
  
  <p>How to cancel the SDWebImage download.
  I have gone through some answers and discussions.But none of them helped me and could not use them</p>
  
  <p>Please help me</p>
  
  <p>I am using </p>
  
  <pre><code>  [cell.UserImage setImageWithURL:[NSURL URLWithString:[SDWebArray objectAtIndex:indexPath.row]]  placeholderImage:[UIImage imageNamed:@"Placeholder.png"]];
  </code></pre>