如何快速从数组中选择随机的十个（字符串） [英] how to pick a random ten (String) from an array in swift

问题描述

有人可以教我如何使用 arc4random_uniform（）从数组中选择一项（ String ）吗？我曾尝试过，但由于无法使用 arc4random_uniform 来选择Int。

could anyone teach me how to select an item (String) from an array by using arc4random_uniform()? I tried but I couldn't because arc4random_uniform can be used for selecting Int.

推荐答案

Swift 3扩展

虽然Oisdk答案有效，但扩展可以比重复编写代码更有用。

While Oisdk answer works, a extension could be more useful instead of writing that coding over and over again.

import Foundation

extension Array {

  func randomElement() -> Element  {
     if isEmpty { return nil }
     return self[Int(arc4random_uniform(UInt32(self.count)))]
  }
}

let myArray = ["dog","cat","bird"]

myArray.randomElement() //dog 
myArray.randomElement() //dog 
myArray.randomElement() //cat 
myArray.randomElement() //bird

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