Answer by nitrocrime · Dec 19, 2012 at 07:02 AM
I've been an iOS developer for quite a while now and http://mycodeteacher.com/ taught me a lot with this! It costs $9,99 per month but it's definitely worth it. Also you can check out the Lynda tutorials http://www.lynda.com/iOS-training-tutorials/413-0.html And then there's of-course Google for searching for tutorials on Objective-C and iOS.
iOS SDK 4.2 invalid checksum 0 Answers