sdkIQ for iPhone (free promo codes)
sdkIQ for iPhone is a great resource for seeing how to implement code from Apple's iPhone SDK. With embedded video demonstrations, code examples, images and references to Apple's online documentation for specific topics, you'll be able to learn while on the go. An Internet connection isn't required.
I've included five promo codes below.
You can download directly from iTunes: iTunes Store.
If you like the app, please leave a rating and review in iTunes. Thanks!