how to use swift 4 sorting method using #keyPath

Question

I have an array of nsmanaged object class. And i want to sort the array using particular element.

every time i try to use it it gives me an error of Argument of '#keyPath' refers to non-'@objc' property 'questions' and Cannot convert value of type 'NSSortDescriptor' to expected element type 'ServiceQuestion'

[NSSortDescriptor(key: #keyPath(objectClassArray), ascending: true)]

Answer 1

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

Use particular element instead of "last" key

(people as NSArray).sortedArray(using: [sortDescriptor]) 

Hope this will help you