Question

我刚刚开始学习Swift，似乎无法弄清楚如何从Swift中选择一个随机数组而不改变每个点击集中游戏。从本质上讲，我的目标是从字典中选择一个随机值，即一个数组，并将其用于其余的运行。我遇到的问题是，我的随机索引randomThemeIndex正在改变每次点击，并且不会为游戏中的所有卡保留相同的主题。因此，它从字典中的每个值中选择各种元素，而不仅仅是一个值/数组。以下是我到目前为止的情况：

var themeChoices = ["halloween": ["", "", "", "", "", "", "", "", "", ""],
                    "animals": ["", "", "", "", "", "", "", "", "", ""],
                    "faces": ["", "", "", "", "", "", "", "", "", "", ""],
                    "nature": ["", "", "", "", "", "", "", "", "", "", "❄️", ""],
                    "food": ["", "", "", "", "", "", "", "", "", "", "", ""],
                    "sports": ["⚽️", "", "", "", "", "⛳️", "", "", "‍♀️", "", "️"]]

var emoji = [Int:String]()


func emoji(for card: Card) -> String {
    let themeCount = themeChoices.count
    let randomThemeIndex = Int(arc4random_uniform(UInt32(themeCount)))
    print(randomThemeIndex)
    var randomTheme = Array(themeChoices.values)[randomThemeIndex]
    if emoji[card.identifier] == nil, randomTheme.count > 0 {
        let randomCardIndex = Int(arc4random_uniform(UInt32(randomTheme.count - 1)))
        emoji[card.identifier] = randomTheme.remove(at: randomCardIndex)
    }
    return emoji[card.identifier] ?? "?"
}

Answer 1

每次拨打emoji(for:)时都不想选择新的随机数组，对吗？因此，您需要将活动数组索引存储在某处并且每次都使用它。

而不是：

func emoji(for card: Card) -> String {
    let themeCount = themeChoices.count
    let randomThemeIndex = Int(arc4random_uniform(UInt32(themeCount)))

试试这样：

func emoji(for card: Card, inTheme randomThemeIndex: Int) -> String {
    // remove those two lines and keep the rest

现在您需要添加主题索引，因此您不必拨打emoji(for: card)，而是拨打emoji(for: card, inTheme: themeIndex)。

您还需要在某处存储主题索引。我不知道你应该在哪里做，因为你的例子中没有足够的代码，但它可能看起来像这样：

lazy var themeIndex: Int = {
    let themeCount = themeChoices.count
    return Int(arc4random_uniform(UInt32(themeCount)))
}()

然后您可以访问self.themeIndex。

_（ツ）_ /¯

从字典

1 个答案: