macOS Handling Command+W for a window in window controller

[satyam90]

I am using Cocoa with Obj C
I am having a window and implemented windowWillCloseNSNotification *)aNotification which works fine only when I click "x" on the top left of the window.
But when I use the keyboard Command+W, the window is closed, but this is not calling windowWillClose. why? How to handle it?

 

[idelovski]

I think you should implement delegate windowShouldClose: like this

- (BOOL)windowShouldCloseNSWindow *)sender

Strange that you say that your Notification works!? How? Isn't notification there just to tell you something already happened.

 

[satyam90]

There is a delegate method available in NSWindow, windowWillClose : (NSNotification *) notification
Please see the NSWindow reference.

 

[idelovski]

Ah!

The point is you don't want to prevent it - you just need information about it and you're quite happy with it? Does that mean "notification works fine?"

 

[idelovski]

This worked for me:

- (id)init
{
   NSNotificationCenter  *nc = [NSNotificationCenter defaultCenter];
   
   [nc addObserver:self
          selector:@selector(windowWillClose:)
              name:NSWindowWillCloseNotification
            object:nil];  // pass window to observe only that window
            
   return (self);
}

- (void)windowWillClose:(NSNotification *)notification
{
   NSLog (@"Notification %@", [notification name]);
}

When I run this code, method windowWillClose: is notified on mouse click in close box, on Command-W and on Command-Q.