You can build a variety of amazing apps on the iOS platformand 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 youre likely to face when creating apps for the iPhone, iPad, or iPod Touch. Each recipe provides a clear solution and sample code that you can use right away.You'll find solutions for working with development frameworks in iOS SDK 4 and technologies such as Cocoa, Objective-C, Xcode, and Interface Builder. Whether you have a little or a lot of experience with iOS development, youll find the help you need for every phase of the process, from initial idea to completed project.Work with Objective-C classes, objects, properties, delegates, and memory managementConstruct a user interface with gesture recognizersDevelop location-aware applications with the Map Kit and Core Location APIsBuild apps that play audio and video, manage calendars and events, access contacts and groups, or tap into the Photo LibraryUse the Core Motion framework to access the accelerometer and gyroscopeMaintain persistent storage for iOS apps with the Core Data frameworkCreate multitasking-aware apps that let users leave and return without losing their place