Skip Navigation

Global Nav Open Menu Global Nav Close Menu
Apple Developer

Search Developer

Apple Developer
Discover
Design
Develop
Distribute
Support
Account

Open Menu Close Menu

IOKit
IOKit Structures
- IOKit
- IOKit Structures
OSNotificationHeader64
reference

Language:
Language:
- Swift
- Objective-C
API Changes:None

Instance Property

reference

No overview available.

SDKs

macOS 10.6+
Mac Catalyst 13.0+

Framework

IOKit

Declaration

var reference: OSAsyncReference64

Developer

Documentation

Discover

macOS
iOS
watchOS
tvOS
Safari and Web
Games
Business
Education
WWDC

Design

Human Interface Guidelines
Resources
Videos
Apple Design Awards
Accessibility
Internationalization
Accessories

Develop

Xcode
Swift
Swift Playgrounds
TestFlight
Documentation
Videos
Downloads

Distribute

Developer Program
App Store
App Review
Mac Software
Apps for Business
Safari Extensions
Marketing Resources
Trademark Licensing

Support

Developer Forums
Bug Reporting
License Agreements
System Status
Contact Us

Account

Certificates, IDs & Profiles
App Store Connect

To receive the latest developer news, visit and subscribe to our News and Updates.

Copyright © 2019 Apple Inc. All rights reserved.

Terms of Use Privacy Policy Report Bugs Feedback

简体中文日本語 한국어