CPU usage OS X interface

I want to implement this Get CPU percent usage in the simplest way it's possible i开发者_StackOverflow中文版n XCode with just a windows that shows the CPU percentage usage but I'm newbie in OS X/Cocoa/OBjective-C. How can I do it?

You should learn the basics of Mac application development. Take a look at Your First Mac Application. It's an Apple tutorial taking you step by step and teaching you how to create Mac applications, from creating the project in Xcode, to polishing your finished application.