macOS Error beeping problem

Hi,

This is a question for (Cocoa) mac app developers, and gurus.

I've started dabbling in Cocoa, and after building my first application, I'v run into a keyboard key binding issue with OS X:

If a key is not assigned to a menu item in MainMenu.nib, then if it is pressed while the app is running, the computer will beep an error sound (eg. Enter/Return, and 1,2,3,4,etc.).

How do I assign a keyboard key for use in my app, without the need to add it to a menu item (so that OS X doesn't beep, when it is pressed)? Can this be done in Interface Builder, or does it have to be written in Cocoa?

Thanks,

I've found a solution.

For anyone wondering the same question, try placing the following method in the code of one of each .m file, and test if it works:

- (void) keyDown: (NSEvent*) theEvent {}

For me, it was the NSView .m file, that made it work.