はじめに

macOSアプリ作成時，アニメーション処理をスリープした時に一時時に止めたくなった．
Swiftでのスリープと復帰の通知の受け方を調べた．

参考：Mac OS Xでスリープ、復帰時の通知を扱う

ソース

AppDelegateに以下のように通知を登録する．

AppDelegate.swift

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    private let nc = NSWorkspace.shared.notificationCenter
    
    func applicationDidFinishLaunching(_ aNotification: Notification) {
        setNotifications()
    }
    
    func applicationWillTerminate(_ aNotification: Notification) {
    }
    
    func setNotifications() {
        nc.addObserver(self, selector: #selector(AppDelegate.receiveSleepNote),
                       name: NSWorkspace.willSleepNotification, object: nil)
        nc.addObserver(self, selector: #selector(AppDelegate.receiveWakeNote),
                       name: NSWorkspace.didWakeNotification, object: nil)
    }
    
    @objc func receiveSleepNote() {
        Swift.print("go to sleep")
    }
    
    @objc func receiveWakeNote() {
        Swift.print("wake up")
    }
    
}