当我们在ios中有超过100个或更多问题时如何生成randon测验问题

Question

我想在ios中开发一个测验应用程序。我看到了一个使用switch case的教程。现在我有几百多个问题。如何实现它，我需要我的问题是随机的。

Answer 1

let randomIndex = Int(arc4random_uniform(UInt32(questionsArray.count)))
print(questionsArray[randomIndex])

使用上面的代码从数组中选择随机问题

Answer 2

您可以使用此处的shuffle function随机播放您的问题。只需将其用作

即可

var nums = [1, 2, 3, 4, 5]
nums.shuffle() // this will mutate and changed to shuffled array [5, 3, 1, 2, 4]

使用的确切扩展名如下：

extension MutableCollection where Indices.Iterator.Element == Index {
    /// Shuffles the contents of this collection.
    mutating func shuffle() {
        let c = count
        guard c > 1 else { return }

        for (firstUnshuffled , unshuffledCount) in zip(indices, stride(from: c, to: 1, by: -1)) {
            let d: IndexDistance = numericCast(arc4random_uniform(numericCast(unshuffledCount)))
            guard d != 0 else { continue }
            let i = index(firstUnshuffled, offsetBy: d)
            swap(&self[firstUnshuffled], &self[i])
        }
    }
}