如何从数组中获取一个随机元素而不是多次抓取同一个元素？

Question

当我使用arc4random_uniform()方法从数组中获取元素时，数组的相同元素通常会被多次抓取。我试图让它成为数组中的每个元素只被抓取一次。我尝试这样做的原因是UITableView中不止一个单元格具有相同的文本。这是UITableView：

中单元格文本的数组

var definitions = ["Used to carry the pharoah","Used to carry bodies as a ceremony","Had a flat deck to carry a farmer's treasure","Daily, it made a trip around the world to carry Ra","Towed by smaller boats, carrying heavy objects","Used for business and pleasure by officials/nobles","Carried most Egyptians and some goods"]

在我的viewDidLoad()方法中，我这样做是为了调用definitions的随机元素：

self.boats = [Boats(name: definitions[Int(arc4random_uniform(7))]),Boats(name: definitions[Int(arc4random_uniform(7))]),Boats(name: definitions[Int(arc4random_uniform(7))]),Boats(name: definitions[Int(arc4random_uniform(7))]),Boats(name: definitions[Int(arc4random_uniform(7))]),Boats(name: definitions[Int(arc4random_uniform(7))]),Boats(name: definitions[Int(arc4random_uniform(7))])]

如何更改我的代码，以便在UITableView中两个元素不会显示两次？谢谢！

Answer 1

保留随机索引值的列表，如果后续随机索引在该列表中，则跳过它并生成另一个随机索引。