ios – 滚动时使用UITableViewAutomaticDimension按照下载的图像高度调整自定义表格单元格高度

我在运行时获取图像的URL并下载&在表格中显示这些图像.图像以异步方式下载(使用SDWeb Image).更重要的是,我希望以实际尺寸显示所有这些图像.第一次,表加载正常,我有超过5个部分(每个部分包含一行),当我滚动表并尝试使用reloadSections更新部分时,表格显示错误的单元格图像高度.有人可以帮我解决这个问题吗？
注意：我使用的是UITableViewAutomaticDimension

[_imageViewSharedImage sd_setImageWithURL:[NSURL URLWithString:[_popUpManager.popUpDetails valueForKey:@"photo"]] placeholderImage:[UIImage imagenamed:@"placeholderBACkground"] options:SDWebImageProgressiveDownload completed:^(UIImage *image,NSError *error,SDImageCacheType cacheType,NSURL *imageURL)
{
     UIImage *croppedImage=[Util adjustImageSizeWhenCropping:image];     
     [_imageViewSharedImage setFrame:CGRectMake(_imageViewSharedImage.frame.origin.x,_imageViewSharedImage.frame.origin.y,croppedImage.size.width,croppedImage.size.height)];
     [_imageViewSharedImage setImage:croppedImage];
     [self setNeedsLayout];
     [self updateConsTraintsIfNeeded];

}];

_imageViewHeightConsTraint.constant = croppedImage.frame.size.height;
_imageViewWidthConsTraint.constant = croppedImage.frame.size.width;