---
title: "init(predicates:sortDescriptors:limit:)"
framework: healthkit
role: symbol
role_heading: Initializer
path: "healthkit/hksamplequerydescriptor/init(predicates:sortdescriptors:limit:)"
---

# init(predicates:sortDescriptors:limit:)

Creates a sample query descriptor.

## Declaration

```swift
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

Discussion The system sets the descriptor’s HKSampleQueryDescriptor/Output type based on the predicates parameter.