Cocoa versus Cocoa Touch - What is the difference?

Question

I am learning iOS development in Objective-C, and I have found a lot of code examples.

Some of them, though, say that they are only for Mac OS X (not iOS).

C

Answer 1

The Migrating from Cocoa Touch section of the iPhone OS Technology Overview provides a good overview of the differences with links to more specific documents for each layer.

The big difference is the UI layer. On the Mac, you have the AppKit framework, on the iPhone, you have UIKit. The smaller differences are in the Foundation framework (linked in the document above).