We just saw how you can send data from HealthKit to an external server, now we need to get to the next step which is receiving data from the external store and save it to HealthKit as well.Like you saw earlier, a patient visits the physical therapists office a couple of times a week and completes six minute walk test. We just want our cumulative statistic, not every single sample. In fact, Apple Watch was released five years ago now.
What if the physical therapist wanted to update a specific test. On Apple platforms, HealthKit is the foundation that provides easy access to the data. Hello and welcome to WWDC.
This takes us back to the idea that each data type needs to be treated differently.We must think about the type of data we are dealing with and what our use case is.The SixMinuteWalkTestDistance is not written to the HealthKit very frequently, and the patient or the physical therapist might be interested in each individual test sample. It will use the Apple Watch to show blood glucose levels for Type 1 diabetics by presenting an easy-to-read graph on the smartwatch's display. Only you have access to it.
That's a lot of data to sync up. If you don't, you could be saving duplicated samples.This means you have to query for the sample, match it to the exact sample the physical therapist has edited, and then save a new sample. If the user didn't mean to delete a sample, then you should probably not be deleting it. Let's see how this query works. If your remote server were also syncing data to your app on Watch, and you tried to save the sample again, HealthKit would see that sample already exists, and ignore it.Now, if the physical therapist decides to update the distance completed in the six minute walk test, we would update the sample by keeping the sync identifier consistent, but increasing the version number. When you press the fetch button, we want to pull the 6 minute walk samples from the server and populate our view controller with it.Let's take a look at the WeeklyReportTableViewController class. The anchor is updated, and HealthKit gives you the new anchor in the updateHandler.It is the last point in time that HealthKit returned samples in the updateHandler.Let's say there were more samples added since your updateHandler was last called.These include samples D and E. Additionally, sample B has since been deleted.For every subsequent query run, only the changes since the previous anchor would be returned in the updateHandle. The new data for the week would have to be sent over to the server. Now initially, for the first query our anchor will be nil. This could be at app launch and maybe every few hours after that.But there are some downsides to using it for reacting to new changes. Arise uses HealthKit to adapt your calorie budget in line with your activities. Each data type can be treated differently. Maybe even the change in weight recorded by the user.When deleting a sample, you need to ensure that it is actually a sample that was previously written by your app. As such, we never want to surprise our users with the changes we make to their health data. For our purposes here, we are considering the external data to be a remote server, but it might as well be an external database maintained locally on the device. Simply removing and then re-saving all the data can result in an inconsistent state of the user's health data. Each sample can then contain a sync identifier metadata key which is derived from the high level report identifier.This way each sample can be uniquely referenced across different weeks. We'll begin with our first topic, Monitoring Changes in HealthKit.
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