title: SDWebImage + UITableViewCell, wrong image when scrolling?
body: <p>i'm having an issue using SDWebImage to load images to a UIImageView inside a custom UITableViewCell.
  This is my code at the UITableView delegate:</p>
  
  <pre><code>    static NSString *userTableId = @"userTableId";
      UserDetailsTableViewCell *cell = (UserDetailsTableViewCell *)[tableView dequeueReusableCellWithIdentifier:userTableId];
      NSDictionary *user = [userList objectAtIndex:indexPath.row];
      NSInteger position = indexPath.row + 1;
      [cell.userDetailsView loadFromDictionary:user WithIndex:position ForCharitie:false];
          cell.userDetailsView.delegate = self;
  
      cell.userDetailsView.delegate = self;
      return cell;
  </code></pre>
  
  <p>And here is my code for loadFromDictionary:</p>
  
  <pre><code>-(void) loadFromDictionary: (NSDictionary *) dic  WithIndex: (NSInteger) index ForCharitie: (BOOL) isCharitie{
      NSDictionary *userImageDic = [dic objectForKey:@"image"];
      NSString *url =[userImageDic objectForKey:@"url"];
  
      [userImage setImage:[UIImage imageNamed:@"defaultAvatar"]];
      if ([url class] != [NSNull class]){
          [userImage setImageWithURL:[NSURL URLWithString:url] placeholderImage:[UIImage imageNamed:@"defaultAvatar"]];
      }
  }
  </code></pre>
  
  <p>Now, the problem is if i scroll down before some images finish loading. For example, let's say I see the first 8 rows, and rows 1, 2 and 3 still loading their images, now i scroll to 9-16, i see the <code>defaultAvatar</code> for all of them, and after a few seconds (i guess when images of rows 1,2 and 3 finish downloading), the images on cells 9, 10 and 11 change to the ones that belong to 1,2 and 3.
  I don't know if there is a way to stop the images from downloading when i reuse the cell, or something like that.
  Thank you and sorry for my English!</p>