在iOS中播种arc4random（） [英] seeding arc4random() in iOS

问题描述

根据我的收集， arc4random（）生成的随机数要比 rand（）好得多，但是我还没有找到播种它的方法，因此我想就像使用 srand（）一样。有办法吗？

From what I can gather arc4random() generates much better random numbers than rand() does, however I haven't seen a way to seed it, and I would like to just like using srand(). Is there a way?

推荐答案

这不是arc4random设计的目的。如文档所述：

That's not what arc4random is designed to do. As the documentation states:

arc4random（）函数可提供高质量的32位伪随机
数字很快。 arc4random（）定期从
中自己植入。

The arc4random() function provides a high quality 32-bit pseudo-random number very quickly. arc4random() seeds itself on a regular basis from the kernel strong random number subsystem described in random(4).

由于它是从熵源重新播种的，因此您通过手动播种不会获得任何收益，实际上，这种方法不存在。

Since it is re-seeds itself from an entropy source anyway, you gain nothing by seeding it manually, and in fact, such a method does not exist.

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