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The Complete Idiot's Guide® To iPad and iPhone App Development by Troy Brant

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iPhone OS 4.0

iPhone OS 4.0 is a big upgrade to the iPhone OS. Here are some of the 4.0 APIs you can now use in your application:
Multitasking—You can now run multiple third-party applications at once.
iAd—By taking advantage of the new iAd framework, you can make money by serving Apple-approved ads to your users.
Game Center—Do you want to build a multiplayer game? With Game Center, you can easily add matchmaking and leader boards to your game.
Local notifications—Local notifications give you the ability to display an alert to the user even when your app is running in the background. For instance, alert your the user when a message arrives in your chat application.
Event Kit—Access the user’s calendar data.
Quick Look—Use the quick ...

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