Here is the video, enjoy!
Learn more about this topic from iOS 4 Programming Cookbook.
You can build a variety of amazing apps on the iOS platform—and every one of them presents a unique set of problems. With the recipes in this cookbook, you'll go beyond theory to solve the vexing, real-life issues you’re likely to face when creating apps for the iPhone, iPad, or iPod Touch. Complete with solutions for problems faced by beginning, intermediate, and advanced developers, this book will take you from concept all the way to the App Store.