这是最简单的方法。导入Gamplaykit到你的VC中，使用下面的代码。在Xcode 8中测试。

 import GameplayKit

 let array: NSArray = ["Jock", "Ellie", "Sue Ellen", "Bobby", "JR", "Pamela"]

 override func viewDidLoad() {
    super.viewDidLoad()

    print(array.shuffled())  
}

如果你想从数组中获得一个打乱的字符串，你可以使用下面的代码..

func suffleString() {

    let ShuffleArray = array.shuffled()

    suffleString.text = ShuffleArray.first as? String

    print(suffleString.text!)

}

这是一些在playground上运行的代码。你不需要在实际的Xcode项目中导入Darwin。

import darwin

var a = [1,2,3,4,5,6,7]

func shuffle<ItemType>(item1: ItemType, item2: ItemType) -> Bool {
    return drand48() > 0.5
}

sort(a, shuffle)

println(a)

Swift 3解决方案，遵循@Nate Cook的回答:(如果索引从0开始，请参阅下面的评论)

extension Collection {
    /// Return a copy of `self` with its elements shuffled
    func shuffle() -> [Generator.Element] {
        var list = Array(self)
        list.shuffleInPlace()
        return list
    } }

extension MutableCollection where Index == Int {
    /// Shuffle the elements of `self` in-place.
    mutating func shuffleInPlace() {
        // empty and single-element collections don't shuffle
        if count < 2 { return }
        let countInt = count as! Int

    for i in 0..<countInt - 1 {
        let j = Int(arc4random_uniform(UInt32(countInt - i))) + i
            guard i != j else { continue }
            swap(&self[i], &self[j])
        }
    }
}

当我将xCode版本升级到7.4 beta时，它停止在“swap(&self[i]， &self[j])”。 致命错误:不支持与自身交换位置

我找到了I = j的原因(交换函数将爆炸)

所以我添加了一个条件，如下所示

if (i != j){
    swap(&list[i], &list[j])
}

丫!对我来说没问题。

斯威夫特4 在for循环中洗牌数组的元素，其中i是混合比例

var cards = [Int]() //Some Array
let i = 4 // is the mixing ratio
func shuffleCards() {
    for _ in 0 ..< cards.count * i {
        let card = cards.remove(at: Int(arc4random_uniform(UInt32(cards.count))))
        cards.insert(card, at: Int(arc4random_uniform(UInt32(cards.count))))
    }
}

或者扩展为Int

func shuffleCards() {
    for _ in 0 ..< cards.count * i {
        let card = cards.remove(at: cards.count.arc4random)
        cards.insert(card, at: cards.count.arc4random)
    }
}
extension Int {
    var arc4random: Int {
        if self > 0 {
            print("Arc for random positiv self \(Int(arc4random_uniform(UInt32(self))))")
        return Int(arc4random_uniform(UInt32(self)))
        } else if self < 0 {
            print("Arc for random negotiv self \(-Int(arc4random_uniform(UInt32(abs(self)))))")
            return -Int(arc4random_uniform(UInt32(abs(self))))
        } else {
            print("Arc for random equal 0")
            return 0
        }
    }
}

在我的例子中，我在数组中交换对象时遇到了一些问题。然后我挠头，开始重新发明轮子。

// swift 3.0 ready
extension Array {

    func shuffled() -> [Element] {
        var results = [Element]()
        var indexes = (0 ..< count).map { $0 }
        while indexes.count > 0 {
            let indexOfIndexes = Int(arc4random_uniform(UInt32(indexes.count)))
            let index = indexes[indexOfIndexes]
            results.append(self[index])
            indexes.remove(at: indexOfIndexes)
        }
        return results
    }

}