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我们最近将我们的应用程序发布到应用商店，几乎立即在 SDWebImageManager imageDownloader:didFinishWithImage 中发生了一些崩溃：堆栈顶部如下所示：

0 libobjc.A.dylib 0x33c28c98 objc_msgSend + 16
1 CoreFoundation 0x308f0571 -[NSObject(NSObject) performSelector:withObject:withObject:] + 25
2 Ourcode 0x0001d98f -SDWebImageManager imageDownloader:didFinishWithImage:
3 CoreFoundation 0x308f0571 -[NSObject(NSObject) performSelector:withObject:withObject:] + 25
4 Ourcode 0x0001cb03 -SDWebImageDownloader connectionDidFinishLoading:

我们有最新的 SD 代码，该代码在此函数内的委托上执行保留。只要我们的委托被正确创建，我看不出我们是如何陷入这种情况的。在我看来，performSelector 上的委托已被释放。但 SDWebImageManager 保留了委托。

imageDownloader:didFinishWithImage: 的相关代码为：

- (void)imageDownloader:(SDWebImageDownloader *)downloader didFinishWithImage:(UIImage *)image
{
    [downloader retain];
    SDWebImageOptions options = [[downloader.userInfo objectForKey:@"options"] intValue];

     // Notify all the downloadDelegates with this downloader
    for (NSInteger idx = (NSInteger)[downloaders count] - 1; idx >= 0; idx--)
    {
        NSUInteger uidx = (NSUInteger)idx;
        SDWebImageDownloader *aDownloader = [downloaders objectAtIndex:uidx];
        if (aDownloader == downloader)
        {
            id<SDWebImageManagerDelegate> delegate = [[[downloadDelegates objectAtIndex:uidx] retain] autorelease];

            if (image)
            {
                if ([delegate respondsToSelector:@selector(webImageManager:didFinishWithImage:)])
                {
                    [delegate performSelector:@selector(webImageManager:didFinishWithImage:) withObject:self withObject:image];
               }
           }
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