# Macros Macros for use with multiple classes. ## Topics ### Macros [`#define APPKIT_API_UNAVAILABLE_BEGIN_MACCATALYST`](/documentation/AppKit/APPKIT_API_UNAVAILABLE_BEGIN_MACCATALYST) [`#define APPKIT_EXTERN`](/documentation/AppKit/APPKIT_EXTERN) [`#define APPKIT_FINAL`](/documentation/AppKit/APPKIT_FINAL) [`#define APPKIT_IVAR`](/documentation/AppKit/APPKIT_IVAR) [`#define APPKIT_PRIVATE`](/documentation/AppKit/APPKIT_PRIVATE) [`#define APPKIT_PRIVATE_EXTERN`](/documentation/AppKit/APPKIT_PRIVATE_EXTERN) [`#define AVAILABLE_MAC_OS_X_VERSION_10_0_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_0`](/documentation/AppKit/AVAILABLE_MAC_OS_X_VERSION_10_0_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_0) [`#define AVAILABLE_MAC_OS_X_VERSION_10_1_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_1`](/documentation/AppKit/AVAILABLE_MAC_OS_X_VERSION_10_1_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_1) [`#define AVAILABLE_MAC_OS_X_VERSION_10_2_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_2`](/documentation/AppKit/AVAILABLE_MAC_OS_X_VERSION_10_2_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_2) [`#define AVAILABLE_MAC_OS_X_VERSION_10_3_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_3`](/documentation/AppKit/AVAILABLE_MAC_OS_X_VERSION_10_3_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_3) [`#define AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_4`](/documentation/AppKit/AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_4) [`#define AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_5`](/documentation/AppKit/AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_5) [`#define AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_6`](/documentation/AppKit/AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_6) [`#define AVAILABLE_MAC_OS_X_VERSION_10_7_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_7`](/documentation/AppKit/AVAILABLE_MAC_OS_X_VERSION_10_7_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_7) [`#define IBSegueAction`](/documentation/AppKit/IBSegueAction) [`#define NSDictionaryOfVariableBindings(...)`](/documentation/AppKit/NSDictionaryOfVariableBindings) Creates a dictionary wherein the keys are string representations of the corresponding values’ variable names. [`var NSIMAGE_UNAVAILABLE_MACCATALYST: Int32`](/documentation/AppKit/NSIMAGE_UNAVAILABLE_MACCATALYST) [`#define NSImageRepRegistryChangedNotification`](/documentation/AppKit/NSImageRepRegistryChangedNotification) Posted whenever the image representation class registry changes. [`#define NSLAYOUTANCHOR_EXTERN`](/documentation/AppKit/NSLAYOUTANCHOR_EXTERN) [`#define NSLAYOUTCONSTRAINT_EXTERN`](/documentation/AppKit/NSLAYOUTCONSTRAINT_EXTERN) [`#define NS_OPENGL_CLASS_DEPRECATED(message, minVers, maxVers)`](/documentation/AppKit/NS_OPENGL_CLASS_DEPRECATED) [`#define NS_OPENGL_DEPRECATED(minVers, maxVers)`](/documentation/AppKit/NS_OPENGL_DEPRECATED) [`#define NS_OPENGL_ENUM_DEPRECATED(minVers, maxVers)`](/documentation/AppKit/NS_OPENGL_ENUM_DEPRECATED) [`var NS_USER_ACTIVITY_SUPPORTED: Int32`](/documentation/AppKit/NS_USER_ACTIVITY_SUPPORTED) [`macro Preview(String?, traits: PreviewTrait..., body: () -> NSViewController)`](/documentation/AppKit/Preview(_:traits:body:)-55ljx) Preview an NSViewController. [`macro Preview(String?, traits: PreviewTrait..., body: () -> NSView)`](/documentation/AppKit/Preview(_:traits:body:)-7pfjp) Preview an NSView. [`macro Preview(String?, traits: PreviewTrait..., arguments: [T], body: (T) -> NSView)`](/documentation/AppKit/Preview(_:traits:arguments:body:)-5hzef) Creates a group of previews of an NSView. [`macro Preview(String?, traits: PreviewTrait..., arguments: [T], body: (T) -> NSViewController)`](/documentation/AppKit/Preview(_:traits:arguments:body:)-7h191) Creates a group of previews of an NSViewController. --- 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)