ArchiveHeader.FieldKeySet An object that represents a field key set. Declarationfinal class FieldKeySet TopicsCreating a Field Key Setinit()init(_:)init(copying:)Specifying Default Field Key SetsdefaultForArchivedefaultForManifest RelationshipsConforms ToBidirectionalCollectionCollectionCopyableCustomStringConvertibleEquatableEscapableExpressibleByArrayLiteralRandomAccessCollectionSequenceSetAlgebra See AlsoManipulating Fieldsfield(forKey:)ArchiveHeader.FieldKeyArchiveHeader.FieldfieldTypeArchiveHeader.FieldTypefieldKey