# enumerateContacts(with:usingBlock:) Returns a Boolean value that indicates whether the enumeration of all contacts matching a contact fetch request executes successfully. ``` func enumerateContacts(with fetchRequest: CNContactFetchRequest, usingBlock block: (CNContact, UnsafeMutablePointer) -> Void) throws ``` ## Parameters `fetchRequest` The contact fetch request that specifies the search criteria. `block` Called for each contact matching the fetch request. ## Return Value if enumeration of all contacts matching a contact fetch request executes successfully; otherwise, . ## Discussion This method waits until the enumeration is finished. If there are no results, the block is not called and the method returns . This method can fetch all contacts without keeping all of them at once in memory, which is expensive. > Handling Errors in Swift: In Swift, this method returns `Void` and is marked with the `throws` keyword to indicate that it throws an error in cases of failure. > You call this method in a `try` expression and handle any errors in the `catch` clauses of a `do` statement, as described in [Error Handling](https://docs.swift.org/swift-book/LanguageGuide/ErrorHandling.html) in [The Swift Programming Language](https://docs.swift.org/swift-book/) and . --- 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)