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This notification will be sent when the disk cache got cleaned either there are cached files expired or the total size exceeding the max allowed size. The manually invoking of clearDiskCache method will not trigger this notification.

The object of this notification is the ImageCache object which sends the notification.

A list of removed hashes (files) could be retrieved by accessing the array under KingfisherDiskCacheCleanedHashKey key in userInfo of the notification object you received. By checking the array, you could know the hash codes of files are removed.

The main purpose of this notification is supplying a chance to maintain some necessary information on the cached files. See this wiki for a use case on it.