SDWebImage + UITableViewCell，滚动时图像错误？ [英] SDWebImage + UITableViewCell, wrong image when scrolling?

问题描述

我在使用SDWebImage将图像加载到自定义UITableViewCell内的UIImageView时遇到问题。
这是我在UITableView委托的代码：

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:

    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;

这是我的loadFromDictionary代码：

And here is my code for loadFromDictionary:

-(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"]];
    }
}

现在，问题是如果我在某些之前向下滚动图像完成加载。例如，假设我看到前8行，第1,2和3行仍然加载他们的图像，现在我滚动到9-16，我看到 defaultAvatar 所有这些，几秒后（我猜第1,2和3行的图像完成下载），单元格9,10和11上的图像变为属于1,2和3的图像。
我不知道是否有办法在重复使用单元格时停止下载图像，或类似的东西。
谢谢你，对不起我的英文！

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 defaultAvatar 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!

推荐答案

如果您在桌面上设置了UITableViewDelegate，则可以使用委托方法：

If you have your UITableViewDelegate set on your table, you could use the delegate method:

- tableView：didEndDisplayingCell：forRowAtIndexPath：

在单元格滚出屏幕时将图像设置为NULL（或默认值）。

to set the image to NULL (or the default) when your cell scrolls off screen.

自从你使用SDWebImage，取消它可以像 cancelCurrentImageLoad 。

And since you're using SDWebImage, canceling it could be as easy as "cancelCurrentImageLoad" on the cell's image view.

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