How to sort Core Data fetched properties

Question

The Core Data Documentation states that:

The fetch request associated with the [fetched] property can have a sort ordering, and thus the fetched prope

Answer 1

For a single fetched property, Swift 4, Xcode 9.4:

// retrieve the fetched property's fetch request    
let fetchedPropertyRequest = (modelName.entitiesByName["entityName"]!.propertiesByName["fetchedPropertyName"] as! NSFetchedPropertyDescription).fetchRequest

// set up the sort descriptors
let sortDescriptors = [NSSortDescriptor(key: "keyName", ascending: true)]

// add the sort descriptors to the fetch request
fetchedPropertyRequest!.sortDescriptors = sortDescriptors

Here's the same thing the loooonnnnnnggggggg way:

// retrieve the fetched property's fetch request
let theEntityDescription: NSEntityDescription = modelName.entitiesByName["entityName"]!
let theFetchedPropertyDescription = theEntityDescription.propertiesByName["fetchedPropertyName"]! as! NSFetchedPropertyDescription
let theFetchedPropertyRequest = theFetchedPropertyDescription.fetchRequest

// set up the sort descriptors
let sortDescriptor1 = NSSortDescriptor(key: "keyName", ascending: true)
let theSortDescriptors = [sortDescriptor1]

// add the sort descriptors to the fetch request
theFetchedPropertyRequest!.sortDescriptors = theSortDescriptors

Note: for this example, I force-unwrapped values. Make sure that you account for optional values in your actual code!