init(predicates:sortDescriptors:limit:)
Creates a sample query descriptor.
Declaration
init(predicates: [HKSamplePredicate<Sample>], sortDescriptors: [SortDescriptor<Sample>], limit: Int? = nil)Parameters
- predicates:
An array of sample predicates that define the type of data that the query returns. To query for multiple types of data, provide a sample predicate for each type.
- sortDescriptors:
An array of sort descriptors that specify the order of the results that the query returns. If you don’t need the results in a specific order, pass an empty array.
- limit:
An optional value that specifies the maximum number of samples that the query returns. If you don’t specify the limit, the system returns all matching samples in the HealthKit store.
Discussion
The system sets the descriptor’s HKSampleQueryDescriptor/Output type based on the predicates parameter.