macOS A simple Cocoa delegation question

I have an NSMatrix of switch buttons. I just want to have my application do something when one of these switch buttons are pressed with the mouse. Can anybody help me on this?

Here's what I have tried: Subclassing NSObject in IB and making the newly created object a delegate of the NSMatrix. But what delegation method should I use? I have tried a few, but none of them work.

Any assistance would be appreciated.

It's ok, I have already gotten my answer.

Delegation is a term to explain events that happen after another event has happened. Simple IBActions do not work that way.

For example, when you close the window, a -windowWillClose delegate function is called. NSView has delegate functions that are invoked when the mouse is over the view, when the mouse is clicked, etc.

In order to use delegate functions, you must write the delegate function you want by writing the function declaration (you can find the declarations and supported delegate functions of each class into the ADC Library) into the implementation file of an object that exists in Interface Builder, and then give any commands you want. In Interface Builder, you must have set the object as delegate of the object you want.

Hope that helps.