This coder is used for HEIC (HEIF with HEVC container codec) image format. Image/IO provide the static HEIC (.heic) support in iOS 11/macOS 10.13/tvOS 11/watchOS 4+. Image/IO provide the animated HEIC (.heics) support in iOS 13/macOS 10.15/tvOS 13/watchOS 6+. See https://nokiatech.github.io/heif/technical.html for the standard.
NoteThis coder is not in the default coder list for now, since HEIC animated image is really rare, and Apple’s implementation still contains performance issues. You can enable if you need this.
NoteIf you need to support lower firmware version for HEIF, you can have a try at https://github.com/SDWebImage/SDWebImageHEIFCoder