How to implement custom NSApplication terminate: behavior in Cocoa?

Question

I am trying to implement custom completion behavior in a Cocoa application. Normally, when my application exits gracefully, it cleans up the final version database and then exits. This happens inside the AppDelegate (delegate NSApplication) when called [NSApp terminate:aSender]:

- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender
{
    // database cleanup...
    return NSTerminateNow;
}

If an error occurred during execution (for example, the database file was deleted), I present the error to the user and give them the option to Restore (return the file and try again) or exit. If Quit is selected, I want the application to skip database cleanup completely, as this has become impossible. In essence, I would like something like this:

- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender
{
    BOOL gracefulTermination = ...;

    if (gracefulTermination == YES)
    {
        // Database cleanup....
    }

    return NSTerminateNow;
}

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Answer 1

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