Apple's HealthKit API enables health and fitness apps to share their data, both with the iOS 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. Healthkit strives for data sharing for health purposes while maintaining the user's privacy and control.
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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.