System/Library/PrivateFrameworks/PhotoLibraryServices.framework

PLFileBackedThumbnailVirtualResource.h

Download PLFileBackedThumbnailVirtualResource.h

1. NSObject
2. >
3. PLVirtualResource

@interface PLFileBackedThumbnailVirtualResource : PLVirtualResource

- (long long)dataLength;
- (long long)estimatedDataLength;

@end