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我正在开发一个应用程序，我必须在其中记录罗盘读数。新 iPhone 3GS 中就有。所以我必须记录罗盘读数并在我的应用程序中使用它。我不想创建自己的指南针。有什么办法可以做到吗？
http://developer.apple.com/iphone/library/documentation/CoreLocation/Reference/CLHeading_Class/Reference/Reference.html