Swift中两位小数之间的随机数 [英] Random number between two decimals in Swift

问题描述

我想得到两个小十进制数之间的随机数。

I'd like to get a random number between two small decimal numbers.

介于0.8和1.3之间。

Between maybe 0.8 and 1.3.

var duration = CGFloat(arc4random() % 0.8) / 1.3

或

var duration = CGFloat(arc4random() % 0.5) + 0.8

谢谢！

推荐答案

这里是一个通用函数我刚刚写了一个范围内的随机数。

Here's a generic function I just wrote up quickly to get a random number within a range.

func randomBetween(_ firstNum: CGFloat, _ secondNum: CGFloat) -> CGFloat{
    return CGFloat(arc4random()) / CGFloat(UINT32_MAX) * abs(firstNum - secondNum) + min(firstNum, secondNum)
}

它需要一个随机数，找到该数字的余数除以两个参数之间的差值，然后加上较小的数字。这保证了随机数在两个数字之间。

It takes a random number, finds the remainder of that number divided by the difference between the two parameters, then adds by the smaller number. This guarantees the random number to be between the two numbers.

免责声明：我还没有对此进行测试。

编辑：现在这个功能可以满足您的需求。

EDIT: Now this function does what you want.

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