Swift how to declare realm results?

Question

How to declare Results generic

I want to declare it like global variable in UITableViewController and fill within viewDidLoad func

Here's my code

class ContactsController: UITableViewController {
    var contacts = Results<Contact>()

        override func viewDidLoad() {
            super.viewDidLoad()
            contacts = Domain.FetchContacts()
        }
}

But I get error

Cannot invoke initializer for type 'Results' with no arguments

How can I declare it?

Answer 1

I declared results generic like this

var contacts: Results<Contact>? = nil

Answer 2

You can declare the contacts like this:

var contacts: Results<Contact>!

or

var contacts: Results<Contact>?

Answer 3

var contacts: Results<Contact> = realm.objects(Contact.self).filter("FALSEPREDICATE")

Answer 4

You need to make your declaration as a optional type. Remove () and put ? after variable declaration like var contacts = Results?