Karma-based API on Apple Platforms by Manuel Carrasco Molina

Author:Manuel Carrasco Molina
Language: eng
Format: epub
ISBN: 9781484242919
Publisher: Apress

The Stored Object

Every combination of a quantity and a type — so, an instance — is stored as an HKObject. A child class from it, HKSample, combines:Sample type

Start Date

End Date

All Properties Are Read-Only!

Yes, you read it right — because it doesn’t make a lot of sense to change the data that was recorded yesterday.

It’s also a good decision to have immutable properties so nothing can be changed by a mean app.

That being said, you can observe when a property changes, for example, when the user became taller. For that, you can use HKObserverQuery . Speaking of which, at the core of some code, we’ll show there’s going to be an HKQuery.

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