Sending messages to objects created in Interface Builder

I'm quite new to Cocoa, Objective-C and OOP in general. I'm learning every day. According to 'Cocoa Programming for Mac OS X for DUMmIES' you can create an object in Xcode like this:

myObject = [[Class_name alloc] init];

Afterwards you'll be able to send it messages according to the methods decladed in Class_name. So far so good. But yesterda开发者_Go百科y I followed this tutorial: Intro to Bindings and noticed something weird. According to the tutorial, you mustcreate an NSArrayController object within Interface Builder. But if you want to add a row to the array, managed by the controller, with values from let's say a couple of NSTextFields, you need to call it's AddObject method, but how? I don't know the objects name or identifier, right?

Simply create an outlet

IBOutlet NSArrayController *arrayController;

and connect your arrayController to it in IB; To call its method use [arrayController methodName];