Question

我正在尝试制作一个游戏，在其中按下卡的背面，它会显示随机卡，然后从卡组阵列中删除该卡。当我模拟程序时，它会随机运行一段时间，然后给我“索引超出范围”错误。

有人看到我做错了什么吗？

var cardDeck = [card1, card2, card3 etc....]

var randomCard: Int = 0




@IBAction func row1card5tap(_ sender: UITapGestureRecognizer) {

    randomCard = Int.random(in: 0...51)

    if cardDeck.contains(cardDeck[randomCard]) {
        row1card5.image = cardDeck[randomCard+1]
        cardDeck.remove(at: randomCard)

        print("removed:" + "\(cardDeck[randomCard])")
    } else {
        print("card already removed")
    }
}

Answer 1

在下标之前，请确保数组计数大于requestIndex + 1。

 var cardDeck = [card1, card2, card3 etc....]

 var randomCard: Int = 0

 @IBAction func row1card5tap(_ sender: UITapGestureRecognizer) {

   randomCard = Int.random(in: 0...51)

   if cardDeck.count > randomCard + 1 {
     row1card5.image = cardDeck[randomCard+1]
     cardDeck.remove(at: randomCard)

     print("removed:" + "\(cardDeck[randomCard])")
   } else {
     print("card already removed")
   }
 }

Answer 2

如果需要

它显示一张随机卡片，然后从卡片组阵列中删除该卡片

然后随机数组的上限应始终是牌组中当前的牌数

var cardDeck = [card1, card2, card3 etc....]

@IBAction func row1card5tap(_ sender: UITapGestureRecognizer) {
    if cardDeck.isEmpty { return }
    let randomIndex = Int.random(in: 0..<cardDeck.count)
    row1card5.image = cardDeck[randomIndex]
    cardDeck.remove(at: randomIndex)
}

在Swift中将随机元素设置为变量

2 个答案: