I'm creating a small app that calculates a user's body mass index. To do this, I need to know how to get the height and weight information. I've read some Apple documentation (here's a link to Apple's HealtKit reference: HealthKit Framework Reference) and am now up to the part of the code that is executed when the HKQuery executed successfully. However, I do not know how to access the data. Will someone please help me? Thanks.