Disabling ESC and Command . in an OSX Cocoa app?

Another approach is to hide the close and Cancel buttons, so they can't be pressed.

Another approach is to hide the close and Cancel buttons, so they can't be pressed: IKPictureTaker *taker = IKPictureTaker pictureTaker; taker setStyleMask:0; //disable close button for(NSView *aView in taker contentView subviews){ if(aView isKindOfClass:NSButton class){ NSButton *aButton = (NSButton*)aView; if(aButton action == @selector(cancelButton:)) aButton set } }.

The close button is disabled in my app, what I am asking about is how to prevent it from being close when someone pressed the esc key or command . – Mike2012 Dec 8 '09 at 18:28 1 It's the cancel or close buttons that are acting on the esc/cmd-. So disabling them gives you the behavior you want.

But if you want the button visible, but without that key equivalent, then instead of doing aButton set aButton setKeyEquivalent:@"" – Vincent Gable Dec 8 '09 at 20:26.

You need to insert yourself somewhere in the responder chain in time to catch the escape key down event, and disable it. You may have to subclass IKPictureTaker. The snippet below should help you (source).

- (void)keyDown:(NSEvent *)event { if (event keyCode == 53) { NSLog(@"Escape has been pressed"); } }.

If you want/need to drop down to the low level, see the CGEvent API. Using it, you'd create a tap and swallow/modify specific events.

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