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iPhone SDK 3.x 和 iPhone 4.x有什么区别？
iPhone 的新功能是什么？
iPhone 程序员如何感受 iPhone SDK 4.x 的功能。?
感谢和问候。
请参阅 Apple 的“iOS 4 中的新增功能”文档：
http://developer.apple.com/library/ios/#releasenotes/General/WhatsNewIniPhoneOS/Articles/iPhoneOS4.html#//apple_ref/doc/uid/TP40009559-SW1