与IBAction链接的UIButton在物理设备上的仿真中也不起作用，在Xcode 9.2中的仿真器中也不起作用

Question

I added the UIButton with Control + Drag, added the variables and arc4random for randomized numbers, and then used a front function to test my button to make sure it worked. But the button is totally unresponsive and I have no errors in my code.

import UIKit

class ViewController: UIViewController {

    var randomDiceIndex1 : Int = 0
    var randomDiceIndex2 : Int = 0

    @IBOutlet weak var diceImageView1: UIImageView!
    @IBOutlet weak var diceImageView2: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    @IBAction func rollButtonPressed(_ sender: UIButton) {

        randomDiceIndex1 = Int(arc4random_uniform(6))
        randomDiceIndex2 = Int(arc4random_uniform(6))

        print(randomDiceIndex1) //This line of code is what I used to test
    }
}

Answer 1

Assign action programmatically.

yrBtnOutlet.addTarget(self, action: #selector(self. rollButtonPressed(_:)), for: .touchUpInside)

Hope this will help.