macOS Cocoa – Windows close button quites App?

[netytan]

Heys,

This is probably so easy, as easy as checking a box in IB even. Anyway, I would like a way to make my Cocoa applications close button (the red button in the top left) quit the application – like with System Preferences 😎.

Thanks all,

Mark.

 

[widgetman]

So what you need to do first is have the window you want to close be connected to an IBOutlet in the nib. For this example i connected the window to an outlet named "mainWindow".

The code to add is:

- (void)awakeFromNib {
        [mainWindow setDelegate:self];
}

- (void)windowWillClose:(NSNotification *)aNotification {
	[NSApp terminate:self];
}

what this code does is overwrite the window closing action and tells it to quit instead. you do not need to add the "windowWillClose:" method to your header file.

 

[robbieduncan]

Or use a delegate to the NSApplication object that returns YES to

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication

You can set any object to be the NSApplication object by putting something like

[NSApp setDelegate:self];

in awakeFromNib.

Documentation here

 

[netytan]

Thanks a lot 🙂 got it working fine with both methods, though I did the delegation in Interface Builder rather than programatically (just seemed like the right thing to do 😉).

Anyway, Is there a way to set NSApp's delegate from Interface Builder too or not?

Thanks again guys,

Mark.

 

[robbieduncan]

As you are not in a document based app the File's Owner is the NSApplication object. You can use this to set the delegate.

Edit: I think this is always true for the MainMenu.nib file. Anyone?

 

[netytan]

Ta Robbie 🙂.

 

[youROCK]

Thanks a lot for this topic, it works! 🙂

 

[Sydde]

Is there a way to set NSApp's delegate from Interface Builder too or not?

Yes.