Multi property sort Swift Array

Question

I have objects that are in an array I'd like to sort

let person = Person()
person.isHome = true
person.firstname = "Foo"
person.surname = "Bar"

etc...

I fetch all the people

guard let allPeople = controller.fetchedObjects as? Array<Person> else { return }

Now I'd like to filter and sort

var homeArray = allPeople
        .filter { $0.isHome == true }
        .sort { $0.surname < $1.surname }

All fine... except, what if I want extra 'sort descriptors' like this...

var homeArray = allPeople
        .filter { $0.isHome == true }
        .sort { $0.surname < $1.surname }
        .sort { $0.firstname < $1.firstname }
        .sort { $0.isOut == true && $1.isOut == false }

I still want them ordered by surname, but I also want them sorted by first name after surname and injured above non injured... What is the syntax? I can't seem to find it anywhere... Do I have to go back to using NSArray?

Is it as simple as

.sort { ($0.isOut == true && $1.isOut == false) && ($0.firstname < $1.firstname) && ($0.surname < $1.surname)}

Change the fetchRequest of NSFetchedResultsController which is much more efficient than manual filtering / sorting — vadian
– vadian, Commented Oct 3, 2016 at 11:26
What if I can't change the FRC? I know that doesn't make a lot of sense, but the guys I'm working for a framework I have to work within... So I get allPeople and then I must filter and sort after fetching... It's not that there isn't a better way to do this... more that I need the syntax for sorting in this way but with multiple properties — Magoo
– Magoo, Commented Oct 3, 2016 at 11:38

user3608500 · Accepted Answer · 2016-10-03 11:33:53Z

1

let new = [person,person1,person2,person3,person4]

var homeInArray = new
.filter { $0.isHome == true &&  $0.isInjured == true }
var homeNINArray = new
.filter { $0.isHome == true &&  $0.isInjured == false }


 var newHomeArray =    homeInArray.sort { $0.firstName < $1.firstName } + homeNINArray.sort { $0.firstName < $1.firstName }

Try it out this solution ...

answered Oct 3, 2016 at 11:33

user3608500

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2 Comments

Magoo Over a year ago

Sorry if I confused things with the bool syntax (which might be wrong) I want to sort not only on bools, but multiple conditions.. I've added first name is as well

Magoo Over a year ago

This is a fair answer to the exact problem I presented though so +1.. but isn't exactly what I need to know

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