Case Insensitive Compare with Core Data and Swift

Question

The following code doesn't work:

let sortDescriptor = NSSortDescriptor(key: "name", ascending: true, selector:"caseInsensitiveCompare")

And gives the following error: 'NSInvalidArgumentException', reason: 'unsupported NSSortDescriptor selector: caseInsensitiveCompare'

Seemed to work fine in Objective-C. Any ideas on why this might be?

Edit: seems like this may not be possible with Core Data/SQLite. In that case, is the best option to get the array and sort it in code afterwards?

score 52 · Answer 1 · edited May 30 '19 at 00:13

52

Swift 3 - 5.0 Syntax

let sortDescriptor = NSSortDescriptor(key: "KeyName", ascending: true, selector: #selector(NSString.caseInsensitiveCompare))

edited May 30 '19 at 00:13

AD Progress

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answered Jul 21 '16 at 10:29

gowthaman-mallow

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This syntax is required by Swift 3. – Matt Dec 07 '16 at 04:47

Martin R · Accepted Answer · 2016-02-03T07:04:27.843

14

The selector is caseInsensitiveCompare:, with the colon, and you can use it with Core Data.

The colon is there because the method (which is an instance method of NSString) takes one argument (the string to compare with).

As list of sort selectors which can be used with Core Data and a SQLite store can be found in Persistent Store Types and Behaviors in the Core Data Programming Guide.

edited Feb 03 '16 at 07:04

answered Feb 03 '16 at 00:05

Martin R

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score 8 · Answer 3 · answered Feb 12 '20 at 12:46

Swift 5, SwiftUI syntax

self._contacts = FetchRequest(
            entity: Contact.entity(),
            sortDescriptors: [
                NSSortDescriptor(key: "name", ascending: true, selector: #selector(NSString.caseInsensitiveCompare(_:)))
            ],
            predicate: predicate
        )

Case Insensitive Compare with Core Data and Swift

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