# sensorReader(_:fetching:didFetchResult:) Provides the delegate with a fetch result. ``` optional func sensorReader(_ reader: SRSensorReader, fetching fetchRequest: SRFetchRequest, didFetchResult result: SRFetchResult) -> Bool ``` ## Parameters `reader` The sensor reader for which the fetch provides results. `fetchRequest` The completed fetch request. `result` The fetch request’s result. ## Discussion The framework expects the app to know the result’s type based on the reader’s sensor. To see a list of result types per sensor, see [`Sample types`](/documentation/SensorKit/SRFetchResult/sample#Sample-types). When a fetch produces multiple results, the framework invokes this callback once for each result. To reuse a fetch result within the scope of this function, create a copy of `fetchResult` rather than assigning a strong reference to it. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)