常用的下载图片的API是下面这个
- (nullable id <SDWebImageOperation>)loadImageWithURL:(nullable NSURL *)url
options:(SDWebImageOptions)options
progress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
completed:(nullable SDInternalCompletionBlock)completedBlock;
创建一个operation,这个operation包含一个cache用的operation,图片的缓存策略逻辑就在里面:
__block SDWebImageCombinedOperation *operation = [SDWebImageCombinedOperation new];
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