捕获NSTextView中关键事件的最佳方法?

I'm slowly learning Objective-C and Cocoa, and the only way I see so far to capture key events in Text Views is to use delegation, but I'm having trouble finding useful documentation and examples on how to implement such a solution. Can anyone point me in the right direction or supply some first-hand help? I'm slowly learning Objective-C and Cocoa, and