# ImageKit Constants ## Topics ### Constants [`extern NSString * const IKFilterBrowserFilterDoubleClickNotification;`](/documentation/Quartz/IKFilterBrowserFilterDoubleClickNotification) Posted when the user double-clicks a filter in the filter browser. [`extern NSString * const IKFilterBrowserFilterSelectedNotification;`](/documentation/Quartz/IKFilterBrowserFilterSelectedNotification) Posted when the user clicks a filter name in the filter browser. [`extern NSString * const IKFilterBrowserWillPreviewFilterNotification;`](/documentation/Quartz/IKFilterBrowserWillPreviewFilterNotification) Posted before showing a filter preview, allowing an application to set the parameters of a filter. [`var IKImageBrowserDropOn: IKImageBrowserDropOperation`](/documentation/Quartz/IKImageBrowserDropOn) Drop the item on the cell. [`var IKImageBrowserDropBefore: IKImageBrowserDropOperation`](/documentation/Quartz/IKImageBrowserDropBefore) Drop the item before the cell. [`let IKFilterBrowserDefaultInputImage: String`](/documentation/Quartz/IKFilterBrowserDefaultInputImage) The key for the default input image. [`let IKFilterBrowserExcludeCategories: String`](/documentation/Quartz/IKFilterBrowserExcludeCategories) The key for excluding filter categories. [`let IKFilterBrowserExcludeFilters: String`](/documentation/Quartz/IKFilterBrowserExcludeFilters) The key for excluding filters. [`let IKFilterBrowserShowCategories: String`](/documentation/Quartz/IKFilterBrowserShowCategories) The key for showing categories. The associated value is a `BOOL` value that determines if the filter browser should show the category list. [`let IKFilterBrowserShowPreview: String`](/documentation/Quartz/IKFilterBrowserShowPreview) The associated value is a `BOOL` value that determines if the filter browser should provide a preview. [`let IKImageBrowserBackgroundColorKey: String`](/documentation/Quartz/IKImageBrowserBackgroundColorKey) A key for the background color of the image browser view. [`let IKImageBrowserCellBackgroundLayer: String`](/documentation/Quartz/IKImageBrowserCellBackgroundLayer) Layer displayed in the background. [`let IKImageBrowserCellForegroundLayer: String`](/documentation/Quartz/IKImageBrowserCellForegroundLayer) Layer displayed in the foreground. [`let IKImageBrowserCellPlaceHolderLayer: String`](/documentation/Quartz/IKImageBrowserCellPlaceHolderLayer) Layer displayed as a placeholder when an image is not yet available. [`let IKImageBrowserCellSelectionLayer: String`](/documentation/Quartz/IKImageBrowserCellSelectionLayer) Layer displayed as the selection. [`let IKImageBrowserCellsHighlightedTitleAttributesKey: String`](/documentation/Quartz/IKImageBrowserCellsHighlightedTitleAttributesKey) A key for the highlighted title attribute for an item in the image browser view. [`let IKImageBrowserCellsOutlineColorKey: String`](/documentation/Quartz/IKImageBrowserCellsOutlineColorKey) A key for the outline color for an item in the image browser view. [`let IKImageBrowserCellsSubtitleAttributesKey: String`](/documentation/Quartz/IKImageBrowserCellsSubtitleAttributesKey) A key for a subtitle attribute for an item in the image browser view. [`let IKImageBrowserCellsTitleAttributesKey: String`](/documentation/Quartz/IKImageBrowserCellsTitleAttributesKey) A key for title attribute of an item in the image browser view. [`let IKImageBrowserGroupBackgroundColorKey: String`](/documentation/Quartz/IKImageBrowserGroupBackgroundColorKey) A key for the background color of a group. [`let IKImageBrowserGroupFooterLayer: String`](/documentation/Quartz/IKImageBrowserGroupFooterLayer) A key for the header layer of the group. [`let IKImageBrowserGroupHeaderLayer: String`](/documentation/Quartz/IKImageBrowserGroupHeaderLayer) A key for the header layer of the group. [`let IKImageBrowserGroupRangeKey: String`](/documentation/Quartz/IKImageBrowserGroupRangeKey) A key for the range of a group. [`let IKImageBrowserGroupStyleKey: String`](/documentation/Quartz/IKImageBrowserGroupStyleKey) A key for the style of a group. [`let IKImageBrowserGroupTitleKey: String`](/documentation/Quartz/IKImageBrowserGroupTitleKey) A key for the title of a group. [`let IKImageBrowserSelectionColorKey: String`](/documentation/Quartz/IKImageBrowserSelectionColorKey) A key for the color that indicates a selection. [`var IKImageStateInvalid: IKImageBrowserCellState`](/documentation/Quartz/IKImageStateInvalid) The thumbnail is invalid. For example, an unsupported image is provided. [`var IKImageStateNoImage: IKImageBrowserCellState`](/documentation/Quartz/IKImageStateNoImage) Returned until a thumbnail has been created from the represented object. [`var IKImageStateReady: IKImageBrowserCellState`](/documentation/Quartz/IKImageStateReady) The receiver’s represented object has been set and the cell is ready to display. [`let IKOverlayTypeBackground: String`](/documentation/Quartz/IKOverlayTypeBackground) A background. [`let IKOverlayTypeImage: String`](/documentation/Quartz/IKOverlayTypeImage) An image. [`let IKPictureTakerAllowsEditingKey: String`](/documentation/Quartz/IKPictureTakerAllowsEditingKey) A key for allowing image editing. [`let IKPictureTakerAllowsFileChoosingKey: String`](/documentation/Quartz/IKPictureTakerAllowsFileChoosingKey) A key for allowing the user to choose a file. [`let IKPictureTakerAllowsVideoCaptureKey: String`](/documentation/Quartz/IKPictureTakerAllowsVideoCaptureKey) A key for allowing video capture. [`let IKPictureTakerImageTransformsKey: String`](/documentation/Quartz/IKPictureTakerImageTransformsKey) A n image transformation key. The associated value is an `NSDictionary` object that can be serialized. [`let IKPictureTakerInformationalTextKey: String`](/documentation/Quartz/IKPictureTakerInformationalTextKey) A key for informational text. The associated value is an `NSString` or `NSAttributedString` object whose default value is `"Drag Image Here"`. [`let IKPictureTakerOutputImageMaxSizeKey: String`](/documentation/Quartz/IKPictureTakerOutputImageMaxSizeKey) A key for the maximum size of the output image. The associated value is an `NSValue` object (`NSSize`). [`let IKPictureTakerRemainOpenAfterValidateKey: String`](/documentation/Quartz/IKPictureTakerRemainOpenAfterValidateKey) A key that determines if the picture taker UI should remain open after the user selects done. [`let IKPictureTakerShowAddressBookPicture: String`](/documentation/Quartz/IKPictureTakerShowAddressBookPicture) [`let IKPictureTakerShowAddressBookPictureKey: String`](/documentation/Quartz/IKPictureTakerShowAddressBookPictureKey) A key for showing the address book picture. [`let IKPictureTakerShowEffectsKey: String`](/documentation/Quartz/IKPictureTakerShowEffectsKey) A key for showing effects. [`let IKPictureTakerShowEmptyPicture: String`](/documentation/Quartz/IKPictureTakerShowEmptyPicture) [`let IKPictureTakerShowEmptyPictureKey: String`](/documentation/Quartz/IKPictureTakerShowEmptyPictureKey) A key for showing an empty picture. The associated value is an `NSImage` object. The default value is `nil`. If set to an image, the picture taker automatically shows an image at the end of the Recent Pictures pop-up menu. that means “no picture.” [`let IKPictureTakerShowRecentPictureKey: String`](/documentation/Quartz/IKPictureTakerShowRecentPictureKey) [`let IKPictureTakerUpdateRecentPictureKey: String`](/documentation/Quartz/IKPictureTakerUpdateRecentPictureKey) A key for allowing a recent picture to be updated. [`let IKSlideshowAudioFile: String`](/documentation/Quartz/IKSlideshowAudioFile) A key specifying the audio file played during the slideshow. [`let IKSlideshowModeImages: String`](/documentation/Quartz/IKSlideshowModeImages) All items in the slideshow are images. [`let IKSlideshowModeOther: String`](/documentation/Quartz/IKSlideshowModeOther) There are a mixture of items in the slideshow (image, PDF, text, HTML, and so on). [`let IKSlideshowModePDF: String`](/documentation/Quartz/IKSlideshowModePDF) All items in the slideshow are PDF documents. [`let IKSlideshowPDFDisplayBox: String`](/documentation/Quartz/IKSlideshowPDFDisplayBox) A key for the PDF display box. [`let IKSlideshowPDFDisplayMode: String`](/documentation/Quartz/IKSlideshowPDFDisplayMode) A key for the PDF display mode. [`let IKSlideshowPDFDisplaysAsBook: String`](/documentation/Quartz/IKSlideshowPDFDisplaysAsBook) A key for displaying the slideshow as a book. The associated value is a `Boolean` data type. [`let IKSlideshowScreen: String`](/documentation/Quartz/IKSlideshowScreen) A key specifying the screen on which the slideshow is displayed. [`let IKSlideshowStartIndex: String`](/documentation/Quartz/IKSlideshowStartIndex) A key for the slideshow item index. The associated value is an index. [`let IKSlideshowStartPaused: String`](/documentation/Quartz/IKSlideshowStartPaused) A key for starting in a paused state. The associated value is a `Boolean` data type. [`let IKSlideshowWrapAround: String`](/documentation/Quartz/IKSlideshowWrapAround) A key for starting the slideshow over after the last slide shows. The associated value is a `Boolean` data type. [`let IKToolModeAnnotate: String`](/documentation/Quartz/IKToolModeAnnotate) The annotation tool. [`let IKToolModeCrop: String`](/documentation/Quartz/IKToolModeCrop) The crop tool. [`let IKToolModeMove: String`](/documentation/Quartz/IKToolModeMove) The move tool. [`let IKToolModeNone: String`](/documentation/Quartz/IKToolModeNone) No tool is set. [`let IKToolModeRotate: String`](/documentation/Quartz/IKToolModeRotate) The rotation tool. [`let IKToolModeSelect: String`](/documentation/Quartz/IKToolModeSelect) The selection tool. [`let IKToolModeSelectEllipse: String`](/documentation/Quartz/IKToolModeSelectEllipse) The selection ellipse. [`let IKToolModeSelectLasso: String`](/documentation/Quartz/IKToolModeSelectLasso) The selection lasso. [`let IKToolModeSelectRect: String`](/documentation/Quartz/IKToolModeSelectRect) Same as `IKToolModeSelect`. [`let IKUIFlavorAllowFallback: String`](/documentation/Quartz/IKUIFlavorAllowFallback) Substitute controls of another size. The associated value is a Boolean value. If the filter cannot provide a view for the requested size and a fallback is allowed, the filter can use controls of a different size. [`let IKUISizeFlavor: String`](/documentation/Quartz/IKUISizeFlavor) A key for the size of the controls in a filter view. The associated value can be [`IKUISizeMini`](/documentation/Quartz/IKUISizeMini), [`IKUISizeSmall`](/documentation/Quartz/IKUISizeSmall), or [`IKUISizeRegular`](/documentation/Quartz/IKUISizeRegular). [`let IKUISizeMini: String`](/documentation/Quartz/IKUISizeMini) A very small control. [`let IKUISizeRegular: String`](/documentation/Quartz/IKUISizeRegular) A standard size control. [`let IKUISizeSmall: String`](/documentation/Quartz/IKUISizeSmall) A small control. [`let IKUImaxSize: String`](/documentation/Quartz/IKUImaxSize) The maximum size of a filter view. [`let IK_ApertureBundleIdentifier: String`](/documentation/Quartz/IK_ApertureBundleIdentifier) The Aperature application—`com.apple.Aperture`. [`let IK_MailBundleIdentifier: String`](/documentation/Quartz/IK_MailBundleIdentifier) The Mail application—`com.apple.mail`. [`let IK_PhotosBundleIdentifier: String`](/documentation/Quartz/IK_PhotosBundleIdentifier) [`let IK_iPhotoBundleIdentifier: String`](/documentation/Quartz/IK_iPhotoBundleIdentifier) The iPhoto application—`com.apple.iPhoto`. ### Deprecated constants [`let IKPictureTakerCropAreaSizeKey: String`](/documentation/Quartz/IKPictureTakerCropAreaSizeKey) A key for the cropping area size. The associated value is an `NSValue` object (`NSSize`). [`let IKPictureTakerShowAddressBookPicture: String`](/documentation/Quartz/IKPictureTakerShowAddressBookPicture) [`let IKPictureTakerShowEmptyPicture: String`](/documentation/Quartz/IKPictureTakerShowEmptyPicture) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)