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Receiving Workspace Notifications

Workspace notifications are posted when:

• applications are launched and terminated

• volumes are mounted or unmounted

• the Finder performs file operations

• the Finder becomes the active application or resigns as the active application

• the user logs out or shuts down the computer

• the computer wakes from sleep.

Receiving Workspace Notifications

NSWorkspace notifications are posted to a notification center provided by the NSWorkspace object, instead of going through the application’s default notification center as most notifications do. To receive NSWorkspace notifications, your application must register an observer with the NSWorkspace notification center, returned by the notificationCenter method.

The code fragment in Listing 1 registers a method observerMethod with the NSWorkspace notification center to receive all NSWorkspace notifications:

Listing 1  Registering for workspace notifications

NSNotificationCenter *notCenter;

SEL observerMethodSEL;

// Assume -observerMethod:(id)aNotification exists

observerMethodSEL = @selector(observerMethod:);

notCenter = [[NSWorkspace sharedWorkspace] notificationCenter];

[notCenter addObserver:self selector:observerMethodSEL

           name:nil object:nil]; // Register for all notifications

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