# NSAsynchronousFetchRequest A fetch request that retrieves results asynchronously and supports progress notification. ``` class NSAsynchronousFetchRequest where ResultType : NSFetchRequestResult ``` ## Topics ### Initializing a Request [`init(fetchRequest:completionBlock:)`](/documentation/CoreData/NSAsynchronousFetchRequest/init(fetchRequest:completionBlock:)) Initializes a new asynchronous fetch request configured with the provided fetch request and completion block. ### Preparing a Request [`completionBlock`](/documentation/CoreData/NSAsynchronousFetchRequest/completionBlock) The block that is executed when the fetch request has completed. [`estimatedResultCount`](/documentation/CoreData/NSAsynchronousFetchRequest/estimatedResultCount) A configuration parameter that assists Core Data with scheduling the asynchronous fetch request. [`fetchRequest`](/documentation/CoreData/NSAsynchronousFetchRequest/fetchRequest) The underlying fetch request that is executed asynchronously. --- 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)