Apple's HealthKit API enables health and fitness apps to share their data, both with the new iOS 8 Health application and with each other. HealthKit can serve as a hub for all the health and fitness apps on an iOS device. This allows consumers to have more oversight of their health and fitness.
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The Apple HealthKit Objective-C Sample Code by Apple demonstrates how to write and read data from HealthKit. With a user's birthday, developers can retrieve information based on queries and statistics.