Is there any way to tell if the user clicked X button in windowWillClose delegate method?
- (void)windowWillClose:(NSNotification *)notification
How know if windowWillClose: is invoked by X button click
Did you try changing the action of the close button ? And set a global variable closedByUser to true
https://stackoverflow.com/questions/7237445/override-nswindow-close-button
Then you can use closedByUser in windoWillClose to do what you want (and reset closedByUser to false)
You can also implement the method windowShouldClose: which tells the delegate that the user has attempted to close a window or the window has received a performClose: message.
It's not called when a user quits an application, just when they close it.