QLThumbnailReply The object that provides a thumbnail for a custom file type. Declarationclass QLThumbnailReply Mentioned inProviding Thumbnails of Your Custom File Types TopicsCreating a Thumbnailinit(contextSize:currentContextDrawing:)init(contextSize:drawing:)init(imageFileURL:)Customizing a Thumbnail ReplyextensionBadgeInitializersinit(contextSize:currentContextDrawingBlock:)init(contextSize:drawingBlock:) RelationshipsInherits FromNSObjectConforms ToCVarArgCustomDebugStringConvertibleCustomStringConvertibleEquatableHashableNSObjectProtocol See AlsoThumbnails for Custom File TypesProviding Thumbnails of Your Custom File TypesQLThumbnailProviderQLFileThumbnailRequest