How do I increment a label value with a button press in Swift

Question

I am trying to increment a label by 2 when I click a button.

import UIKit

class ViewController: UIViewController {

    var cur = 0;

    @IBOutlet weak var money: UILabel!

    @IBAction func pressbutton(sender: UIButton) {
        cur = money.text!.toInt()!;
        self.money.text = String(cur + 2);

    }

}

Here is my current code but I am getting the error

toInt() is unavaliable: Use Int() initializer

on this line

cur = money.text!.toInt()!;

Answer 1

You shouldn't be using the content of a label to increment your label according to MVC programming. Instead, use a variable to store your Int and update the label by adding a property observer to the variable like so:

class ViewController: UIViewController {

    @IBOutlet weak var someLabel: UILabel!

    var someValue: Int = 0 {
        didSet {
            someLabel.text = "\(someValue)"
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        someValue = 0 // didSet is called when the variable is changed, not upon initialization.
    }

    @IBAction func buttonPressed(sender: UIButton) {
        someValue += 2
    }
}

Also, I would consider renaming your variable to something more descriptive than cur, and you may omit the semicolons as they are unnecessary.