API to detect active session in Mac OS X with fast user switch

Question

On Mac OS X Snow Leopard with fast user switching enabled, is there an API to detect whether or not my application is running in the active user session? I.e. the session cu

Answer 1

This worked for me (10.14 / Swift 4)

        //Fast user switch out
    NSWorkspace.shared.notificationCenter.addObserver(
        self,
        selector: #selector(becameInactive),
        name: NSWorkspace.sessionDidResignActiveNotification,
        object: nil
    )

    //Fast user switch bak in
    NSWorkspace.shared.notificationCenter.addObserver(
        self,
        selector: #selector(becameActive),
        name: NSWorkspace.sessionDidBecomeActiveNotification,
        object: nil
    )

    // Switching workspace (spaces)
    NSWorkspace.shared.notificationCenter.addObserver(
        self,
        selector: #selector(workspaceSwitched),
        name: NSWorkspace.activeSpaceDidChangeNotification,
        object: nil
    )