在Swift 4中改组多选数组

Question

有人可以解释我如何改组包含多个项目的数组，如下所示：

var answers = [["A","B","C"], ["D","E","F"], ["G","H","I"], ["J","K","L"]]

我知道要改组一个简单的数组，但这个更复杂，我尝试了很多方法，没有任何作用。 提前谢谢。

Answer 1

关于洗牌阵列有很多关于SO的问题。我个人使用的解决方案是GameplayKit提供的功能。你不需要编写游戏来使用它：

import GameplayKit

var answers = [["A","B","C"], ["D","E","F"], ["G","H","I"], ["J","K","L"]]
answers = GKRandomSource.sharedRandom().arrayByShufflingObjects(in: answers) as! [[String]]