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Cocoa in a Few Words

It isn't about you. It isn't about your code. And it isn't about your code doing this or that. It's first about the user and responding to the user. It's second about your code responding to the framework. You don't usually tell the framework what to do. It asks you for things when it needs something. You sit and wait for it to talk to you. You're not in charge. You don't control the runloop; it controls you. You register to be told when things happen, and you indicate that you're the object who knows something about something (data for a table for instance). And then you let go, and let Cocoa do the rest. It's a very different world. I like it very much.

– Rob Napier