Show HN: I'm releasing a series of OS iOS/Mac apps to show how they're built

I'm a iOS and Mac developer and the thing that mostly bothered me when I first started learning Cocoa programming was the lack of full featured sample code.

Now things have changed and more projects have been released, but I still want to do my part.

I've already released Color Picker Pro for Mac:

https://raw.github.com/oscardelben/Color-Picker-Pro

This time I built a copy of the iPhone Calculator which (I hope) will be simple to follow for beginners:

https://github.com/oscardelben/iPhoneCalculator

I hope this will be useful to people who are learning Cocoa. Feedbacks are very appreciated.