Ios 收到的SDWebImage图像大小为空

我试图用SDWebImage显示进度视图，但当我尝试下面的代码时，它在receivedSize中返回0

[cell. ImageHotDish setImageWithURL:[NSURL URLWithString:picName]
     placeholderImage:[UIImage imageNamed:nil]
     options:0 progress:^(NSUInteger receivedSize, long long expectedSize) {
         NSLog(@"Downloaded = %@",receivedSize);
     } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
         [cell.ImageHotDish setImageWithURL:[NSURL URLWithString:picName]];
     }];

我收到的尺寸是空的

[cell. ImageHotDish setImageWithURL:[NSURL URLWithString:picName]
     placeholderImage:[UIImage imageNamed:nil]
     options:0 progress:^(NSUInteger receivedSize, long long expectedSize) {
         NSLog(@"Downloaded = %@",receivedSize);
     } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
         [cell.ImageHotDish setImageWithURL:[NSURL URLWithString:picName]];
     }];

谁能告诉我哪里做错了

我已经检查了这个解决方案，但它没有显示进度，只是一个活动指示器。我想得到的是下载了多少图片

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是否加载图像？@manujmv Yes图像加载成功是否接收到大小始终显示为0？@manujmv Yes，始终显示大小0为什么要在完成块中再次设置图像？