Xcode 11 ... can't even loop

You should format the code with code formatter tool <>. That makes reading and referencing much easier.

@IBOutlet var cardButtons: [UIButton]!

@IBAction func touchCard(_ sender: UIButton) {
        flipCount += 1
     
        if let cardNumber = cardButtons.firstIndex(of: sender)
        {
            game.chooseCard(at: cardNumber)
            updateViewFromModel()
        }
    }

func updateViewFromModel()
    {
        for index in cardButtons.indices {
          
            var button = cardButtons[index]
            var card = game.cards[index]
            //Loop always iterates here <-- the problem
            if card.isFaceUp
            {
                //button.setTitle(emoji( for: card), for: .normal)
                button.backgroundColor = card.isMatched ? .lightGray : .orange
                button.isEnabled = card.isMatched ? false : true
            } else
            {
                //button.setTitle("", for: .normal)
                button.backgroundColor = .orange
            }
            print("Apple should be ashamed of xcode 11")
        }
    }

Do you get your print about XCode 11 on console ?

I understand no.

So, a common practice for debugging is add print at selected locations.

Line 14, add:

print("indices", cardButtons, cardButtons.indices)

to check if you enter in the func and if your array is empty.

Of course, you have checked that you did connect the buttons to the IBOutletCollection ?

Hi Claude31. Thanks for responding. I've been messing with this for hours and hours. What I know for certain is this code worked in xcode10. i think I'm really over trying to make it work and quickly getting over IOS development. I suspect that there may be something in OS 10.15 that will correct this.