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Editorial Team
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Asked: 2026-05-22T16:59:00+00:00

I want to close my application when the last main window closes. I cannot

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I want to close my application when the last main window closes. I cannot use applicationShouldTerminateAfterLastWindowClosed: for the following reasons:
1. Before showing the main window, one confirmation window is displayed and when this window is closed, the application should not quit.
2. The application should quit after closing the main window even if there is any help window still open.

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1 Answer

  1. Editorial Team

    What you need to do is set you controlling class as the delegate of your main window, and then using NSNotificationCenter add an observer with the NSWindowWillCloseNotification with yourWindow being the object. So like this

    NSNotificationCenter *c = [NSNotificationCenter defaultCenter];
[c addObserver:self selector:@selector(yourSelector) name:NSWindowWillCloseNotification object:yourWindow];

    Now, the method yourSelector will be called when the main window is close, so in that method just have something like exit(0);

    For more info go here and look at windowWillClose

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