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I need some help to build a Notification method for applicationWillClose. I want to insert an action on that event, so when the app closes it executes a method. I’ve never used any notification methods and have no idea on how to build them.

Check out:


and read up on the classes involved.

In short, your application delegate will receive this notification automatically just by implementing the following method.

Other classes and controllers can achieve this by explicitly listening for the NSApplicationWillTerminateNotification notification.

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillTerminate:) name:NSApplicationWillTerminateNotification object:nil];

In the second example, the selector does not need to be named applicationWillTerminate; just as long as it carries the standard notification signature; but considering the method is already defined as a category member of NSObject, you may as well reuse it.

When I click “Quit” in my program, an IBAction gets called. The IBAction runs a few methods, and then tells the FilesOwner to terminate. But sometimes those methods (which reset some settings) don’t run, and the application quits anyway.

I didn’t know how to connect it to FirstResponder. But: IBOutlet NSApplication *myOwner; is what I have, and that is connected to FilesOwner. Quit is in my menu. After resetting my settings I write [myOwner terminate:sender];

Leave Quit hooked up to the First Responder like it normally is. Have your controller become NSApp’s delegate, and implement the - (void)applicationWillTerminate:(NSNotification *)notification; method.