Convert UITextField in Int or Double

Question

I am having issue with this code, learning swift and I cannot understand why.

What I want to do is user enter on two TextField two numbers, click a Button, and then get the result on Label.

I know TextField don't allow Int, but only string and I know there is method to convert string to Int, but it is not working for me.

Here is the code:

import UIKit

class ViewController: UIViewController {


    @IBOutlet weak var firstNumber: UITextField!
    @IBOutlet weak var secondNumber: UITextField!
    @IBOutlet weak var resultButton: UIButton!
    @IBOutlet weak var resultNumber: UILabel!

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


    }

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

    var firstNumberConv :Int? = Int(firstNumber.text)
    var secondNumberConv :Int? = Int(secondNumber.text)
    var result = firstNumberConv + secondNumberConv

    @IBAction func resultFunction(_ sender: AnyObject) {
        resultNumber.text = result

    }

}

Answer 1

why don´t put your code inside of your action

something like this

@IBAction func resultFunction(_ sender: AnyObject) {
    let firstNumberConv :Int? = Int(firstNumber.text!)
    let secondNumberConv :Int? = Int(secondNumber.text!)
    guard firstNumberConv != nil && secondNumberConv != nil else {
       return
    }
    let result = firstNumberConv! + secondNumberConv!
    resultNumber.text = String(result)

}

I hope this helps you