Removing instances of a class in Swift

I am trying to fully understand the process of creating class objects in Swift. Keeping in mind the MVC idea, I have the following simple class to represent my data model:

// Person.swift

import Foundation

class Person {

    var first: String = "first"
    var last: String = "last"
}

      

        
        
        
      

    

In my opinion the controller has two IBOutlets

connected to UITextFields

. Using the method IBAction

, I am setting variables first

and last

with text from text boxes.

//  ViewController.swift

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var firstName: UITextField!
    @IBOutlet weak var lastName: UITextField!

    // MARK: - Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    // MARK: - IBAction
    @IBAction func addPerson(sender: AnyObject) {

        let peep = Person()
        peep.first = firstName.text
        peep.last = lastName.text
        println("\(peep.first) \(peep.last)")
    }
}

      

        
        
        
      

    

Each time the method is called IBAction

, a new instance of the class is created Person

. For my example, I'm only interested in the latest instance Person

. How can I delete variables of the primary instance?