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Now that Apple has introduced the GameKit framework to its iOS SDK, you can integrate Game Center features directly into your iPhone and iPad apps. This concise cookbook shows you how it's done, with 18 targeted recipes for adding leaderboards, user authentication, achievements, multiplayer games, and many other features.

How do you display players' scores and achievements? How do you create Game Center accounts and add friends? Each recipe in this book includes a simple code solution you can put to work immediately, along with a detailed discussion that offers insight into why and how the recipe works.

Recipes include techniques to:

• Set up Game Center for an iOS App
• Use block objects and Grand Central Dispatch to write Game Center apps
• Authenticate a local player in Game Center
• Use iTunes Connect to create leaderboards and achievements
• Retrieve leaderboard and achievement information programmatically
• Handle players' state changes in multiplayer games

Vandad Nahavandipoor has developed software using Cocoa, Cocoa Touch, Assembly, Delphi, and .NET for many years. As a staff member of acompany that is a global leader in mobile money solutions in London, he has worked with some of the world's biggest brands--such as Visaand US Bank---to deliver mobile applications to their customers.Vandad brings an interest in management, leadership andentrepreneurship to his work, believing in the synergy that isachieved as a result of cooperation and working together in a team.