Predicate to filter .asleep from sleepAnalysis

问题

I have a issue I'm trying to resolve at Calculate Asleep time in HealthKit using Swift. It is regarding only summing the .asleep values with my query. Through my research, I believe the solution resides in a predicate that filters this value. Then, I can use NSCompoundPredicate to merge the predicates together for my query. I just don't know how to reach it. Here is the predicate line I'm trying to use:

        let predicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: .strictStartDate)
        let asleepPredicate = HKQuery.predicateForObjects(from: HKObjectType.categoryType(forIdentifier: HKCategoryValueSleepAnalysis.asleep))
        let queryPredicate = NSCompoundPredicate(notPredicateWithSubpredicate: predicate, asleepPredicate)

I get the following error:

Cannot convert value of type 'HKCategoryValueSleepAnalysis' to expected argument type 'HKCategoryTypeIdentifier'

I know that I am close to resolving this issue and any guidance provided is greatly appreciated.

来源：https://stackoverflow.com/questions/61272231/predicate-to-filter-asleep-from-sleepanalysis