'Are there any Events or Notifications to get notified when the macOS system is rebooted or OS updated?

Are there any Events or Notifications in Swift/Objective-C to get notified when the macOS system is rebooted or OS updated? We want to do something after the system restart or when OS is updated.

How to detect or get notify :-

  1. When system restarted?
  2. When system OS updated?
swiftobjective-cmacos


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