ios – 错误：实例成员不能用于’ViewController’类型[复制]

参见英文答案 > Instance member cannot be used on type of custom class????????????????????????????????????3个
我正在通过stanford课程在线讲座来制作专注游戏,我的代码的一部分出现错误.我收到错误“实例成员’cardButtons’不能用于类型’ViewController’”,但代码似乎适用于教师.有人可以帮我解决这个问题吗？这是代码的一部分.第4行出错

import UIKit

class ViewController: UIViewController {

@IBOutlet var cardButtons: [UIButton]!

lazy var game = Concentration(numberOfPairsOfCards: cardButtons.count / 2)

var flipCount = 0 {
    didSet {
        flipCountLabel.text = "Flips: (flipCount)"
    }
}

@IBOutlet weak var flipCountLabel: UILabel!


@IBAction func touchCard(sender: UIButton) {
    flipCount += 1
    if let cardNumber = cardButtons.indexOf(sender) {
        game.chooseCard(at: cardNumber)
        updateViewFromModel()
    } else {
        print("chosen card was not in array cardButtons")
    }

}

func updateViewFromModel() {
    for index in cardButtons.indices {
        let button = cardButtons[index]
        let card = game.cards[index]
        if card.isFaceUp {
            button.setTitle(emoji,forState: UIControlState.Normal)
            button.backgroundColor = UIColor.whiteColor()
        } else {
            button.setTitle("",forState: UIControlState.Normal)
            button.backgroundColor = card.isMatched ? UIColor.clearColor() : UIColor.orangeColor()
        }

    }
}

    var emojiChoices = ["                        
（编辑：李大同）
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