洗牌 NSMutableArray 的最佳方法是什么?

What#39;s the Best Way to Shuffle an NSMutableArray?(洗牌 NSMutableArray 的最佳方法是什么?)

问题描述

如果你有一个NSMutableArray，你如何随机打乱元素?

If you have an NSMutableArray, how do you shuffle the elements randomly?

(我对此有自己的答案，发布在下面，但我是 Cocoa 的新手，我很想知道是否有更好的方法.)

(I have my own answer for this, which is posted below, but I'm new to Cocoa and I'm interested to know if there is a better way.)

更新:正如@Mukesh 所指出的，从 iOS 10+ 和 macOS 10.12+ 开始，有一个 -[NSMutableArray shuffledArray] 方法可用于随机播放.请参阅 https://developer.apple.com/documentation/foundation/nsarray/1640855-shuffledarray?language=objc 了解详情.(但请注意，这会创建一个新数组，而不是在原地打乱元素.)

Update: As noted by @Mukesh, as of iOS 10+ and macOS 10.12+, there is an -[NSMutableArray shuffledArray] method that can be used to shuffle. See https://developer.apple.com/documentation/foundation/nsarray/1640855-shuffledarray?language=objc for details. (But note that this creates a new array, rather than shuffling the elements in place.)

推荐答案

你不需要 swapObjectAtIndex 方法.exchangeObjectAtIndex:withObjectAtIndex: 已经存在.

You don't need the swapObjectAtIndex method. exchangeObjectAtIndex:withObjectAtIndex: already exists.

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