ioscreator.com - iOS 8 Calculator updated view controller

ViewController

import UIKit

class ViewController: UIViewController {
    
    var isTypingNumber = false
    var firstNumber:Int!
    var secondNumber:Int!
    var operation = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        firstNumber = 0
        secondNumber = 0
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBOutlet weak var calculatorDisplay: UILabel!

    @IBAction func numberTapped(sender: AnyObject) {
        var number = sender.currentTitle
        
        if isTypingNumber {
            calculatorDisplay.text = calculatorDisplay.text! + number!!
        } else {
            calculatorDisplay.text = number
            isTypingNumber = true
        }
    }
    
    @IBAction func calculationTapped(sender: AnyObject) {
        isTypingNumber = false
        firstNumber = calculatorDisplay.text?.toInt()!
        
        
        operation = sender.currentTitle!!
    }
    
    
    @IBAction func equalsTapped(sender: AnyObject) {
        isTypingNumber = false
        var result = 0
        secondNumber = calculatorDisplay.text?.toInt()!
        
        if operation == "+" {
            result = firstNumber + secondNumber
        } else if operation == "-" {
            result = firstNumber - secondNumber
        }
        
        calculatorDisplay.text = "\(result)"
    }
    
}

try to update the code, please! There's no .toInt() function in Swift anymore! This code it won't work like it's written!

calculatorDisplay.text?.toInt()!

becomes :
Int(calculatorDisplay.text!)!