Calling IBAction from another method without parameter

Question

In my program 2 functions (IBAction player.Move(UIButton) and autoMove()) are supposed to be called by turns till all of the fields (UIButtons) has been clicked. For this I've created a function play(). However, I don't know how can I put the IBAction playerMove inside of play() function, because I need no parameter here.
I've found some answers and tried self.playerMove(nil) and self.playerMove(self) but it doesn't work.

import UIKit

class ViewController: UIViewController {

@IBOutlet var cardsArray: Array<UIButton> = [] 

var randomCard = 0


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


func play () {
    self.autoMove()
    self.playerMove(self) // <----- here is my problem

}



@IBAction func playerMove(sender: UIButton) {

    switch (sender) {

    case self.cardsArray[0]:
        self.cardPressedAll(0)

    case self.cardsArray[1]:
        self.cardPressedAll(1)

    case self.cardsArray[2]:
        self.cardPressedAll(2)

    case self.cardsArray[3]:
        self.cardPressedAll(3)

    default: break
    }

}


func cardPressedAll (cardNumber: Int) {

    self.cardsArray[cardNumber].enabled = false

    self.cardsArray[cardNumber].setBackgroundImage(UIImage(named: "cross"), forState: UIControlState.Normal)

    self.cardsArray.removeAtIndex(cardNumber)

}


  func autoMove (){

    self.randomCard  = Int(arc4random_uniform(UInt32(self.cardsArray.count)))

    self.cardsArray[self.randomCard].enabled = false

    self.cardsArray[self.randomCard].setBackgroundImage(UIImage(named: "nought"), forState: UIControlState.Normal)

    self.cardsArray.removeAtIndex(self.randomCard)
}

}

Answer 1

Either you have to call playerMove: without a button, in which case you have to declare the sender parameter as an optional. Like:

@IBAction func playerMove(sender: UIButton?) {

UIButton means that you have to pass in a button. nil is not a button, but with UIButton?, that is to say Optional<UIButton>, nil is a valid value meaning the absence of a button.

Or you have to work out which button you want to pass to playerMove: to make it do what you want. Sit down and work out what you want to have happen, and what the code needs to do in order to make that happen.