# keysSortedByValue(using:) Returns an array of the dictionary’s keys, in the order they would be in if the dictionary were sorted by its values. ``` func keysSortedByValue(using comparator: Selector) -> [Any] ``` ## Parameters `comparator` A selector that specifies the method to use to compare the values in the dictionary. The `comparator` method should return `NSOrderedAscending` if the dictionary value is smaller than the argument, `NSOrderedDescending` if the dictionary value is larger than the argument, and `NSOrderedSame` if they are equal. ## Return Value An array of the dictionary’s keys, in the order they would be in if the dictionary were sorted by its values. ## Discussion Pairs of dictionary values are compared using the comparison method specified by `comparator`; the `comparator` message is sent to one of the values and has as its single argument the other value from the dictionary. ## See Also [`allKeys`](/documentation/Foundation/NSDictionary/allKeys) A new array containing the dictionary’s keys, or an empty array if the dictionary has no entries. [`- sortedArrayUsingSelector:`](/documentation/Foundation/NSArray/sortedArray(using:)-9nhh9) Returns an array that lists the receiving array’s elements in ascending order, as determined by the comparison method specified by a given selector. --- 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)