HealthKit is the most important API when it comes to building health, fitness and workout apps. HealthKit also has many intricacies and details which need introduction when getting started.
The data structures encourage precision while having the flexibility to store a variety of values. The way it asks users give app access HealthKit will probably be similar with many iOS developers. HealthKit follows many patterns in other iOS APIs such as Core Location or Core Data. At the same time it uses newer programming techniques and newer technology.
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