If you know C, OO principles and what Dynamic Typing means, and if you really do know other programming languages you can learn Obj-C in minutes just from a syntax reference.
http://en.wikibooks.org/wiki/Objective-C_Programming/syntax
Make yourself a little project, for example to learn C++ I made a Hex game and an AI to go with it.
http://en.wikibooks.org/wiki/Objective-C_Programming/syntax
Make yourself a little project, for example to learn C++ I made a Hex game and an AI to go with it.