Sort user list: SwiftUI - Firebase

Question

I am creating an application in Swift, and I am creating a section with a calendar where you will be able to see the list of users with a numeric data entered by them. These data are collected in a structure as follows:

struct User: Identifiable {
    var id: String = UUID().uuidString
    var name: String
    var surname: String
    var timetables: [String]

    var toCheck: [String] {
        return [name, surname]
    }
}

User information is displayed like this:

ForEach(administratorManager.users) { user in
    HStack {
        VStack(alignment: .leading) {
            Text(user.name).font(.subheadline) 
            Text(user.surname).font(.subheadline)
            Text(user.orari[day]).font(.subheadline)
        }
    }
    Spacer()
}

And they are displayed on the screen like this: Photo of the list displayed on the screen

The data is sorted according to their position in the database: Photo of the data in the database

I'd like to sort the list by the number entered under the user's first and last name (the smallest above and so on). Anyone know how to fix?

Are you asking how to sort an array of strings in Swift?

Frank van Puffelen
– Frank van Puffelen

2022-08-07 19:59:47 +00:00
Commented Aug 7, 2022 at 19:59 — Frank van Puffelen
– Frank van Puffelen, Commented Aug 7, 2022 at 19:59

marcprux · Accepted Answer · 2022-08-07 21:26:13Z

1

Assuming administratorManager.users is a Swift.Array (or other sortable in-memory collection), you can sort it however you want. This is one possible way you might sort on the surname and name fields:

var body: some View {
    ForEach(administratorManager.users.sorted(using: [
        KeyPathComparator(\.surname, order: .forward),
        KeyPathComparator(\.name, order: .forward),
    ])) { user in
        Text(user.name)
    }
}

If you want to sort on the initial element of the associated timetables array, you can traverse a property with the KeyPathComparator:

KeyPathComparator(\.timetables.first, order: .forward)

And if the value needs to be calculated, you can add it as a calculated property:

extension User {
    var minTimetable: String? {
        timetables.min()
    }
}

and then reference that property from the comparator:

KeyPathComparator(\.minTimetable, order: .forward)

edited Aug 7, 2022 at 21:26

answered Aug 7, 2022 at 20:53

marcprux

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