Swift中的随机值 [英] Random value in Swift

问题描述

我正在尝试设置一个介于0和屏幕尺寸之间的值。所以我这样做是这样的：

I'm trying to have a value who is between 0 and the size of my screen. So i did it like this :

let sizeX = Int(CGRectGetMaxX(self.frame))
let sizeY = Int(CGRectGetMaxY(self.frame))
var randomX = CGFloat(arc4random()) % sizeX
var randomY = CGFloat(arc4random()) % sizeY
self.touchButton.position = CGPointMake(randomX, randomY)

我有此错误：
找不到' ％'接受提供的参数

I have this error : could not find an overload for '%' that accepts the supplied arguments

我需要使用此参数来随机化SkSpriteNode的位置，也许有更好的解决方案吗？

I need this to randomize the position of an SkSpriteNode, maybe is there a better solution ?

谢谢

推荐答案

转换 arc4random（）返回一个Int，然后将整个表达式转换为CGFloat：

Convert the value that arc4random() returns to an Int and then convert the whole expression to a CGFloat:

var randomX = CGFloat(Int(arc4random()) % sizeX)
var randomY = CGFloat(Int(arc4random()) % sizeY)
self.touchButton.position = CGPointMake(randomX, randomY)

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