The metadata for this HealthKit object.
- iOS 8.0+
- Mac Catalyst 13.0+
- watchOS 2.0+
The metadata dictionary contains extra information describing this object. The dictionary’s keys are all
NSString objects. The values can be
NSNumber objects or
NSDate objects. For a complete list of predefined metadata keys, see Metadata Keys.
Using predefined keys helps facilitate sharing data between apps; however, you are also encouraged to create your own, custom keys as needed to extend the HealthKit object’s capabilities.
You set an object’s metadata when you create the object by calling one of these methods (or a related method):