@DTS Engineer document say HealthKit executes queries asynchronously on a background queue. but The method execute(_:) should not block the current thread.
code like print("execute begin:(Date().timeIntervalSince1970)") HKHealthStore().execute(query) print("execute end:(Date().timeIntervalSince1970)")
ZHIMING1
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I know HealthKit executes queries asynchronously on a background queue，
it query in back queue, but The method should not block the current thread
just code like this，why cost 3.5m？
print("execute begin:(Date().timeIntervalSince1970)")
HKHealthStore().execute(query)
print("execute end:(Date().timeIntervalSince1970)")