Why isn't applicationShouldOpenUntitledFile being called?

Question

I added a applicationShouldOpenUntitledFile method to my application delegate, returning NO as Apple's documentation specifies. However, I'm still getting a new document on startup. What's wrong?

@implementation AppDelegate

@synthesize window;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    NSLog( @"This is being called" );
}

- (BOOL)applicationShouldOpenUntitledFile:(NSApplication *)sender
{
    NSLog( @"This never is" );
    return NO;  
}

@end

Answer 1

You're running Lion. When you ran before adding the applicationShouldOpenUntitledFile handler, a new document was created. Now, with 10.7's "Restore windows when quitting and re-opening apps", your application is restoring that untitled window, and not creating a new one as you suppose.

Close that window and re-run your application, and applicationShouldOpenUntitledFile will be called and will suppress the creation of a new untitled file.