xcode Swift 表达式太复杂，无法在合理的时间内解决
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原文地址: http://stackoverflow.com/questions/33794574/
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Swift expression was too complex to be solved in reasonable time
提问by lagro23
I'm having an error when compiling a project in Xcode, it says:
在 Xcode 中编译项目时出现错误，它说：
Expression was too complex to be solved in reasonable time; consider breaking up the expression into distinct sub-expressions
表达式太复杂，无法在合理的时间内解决；考虑将表达式分解为不同的子表达式
here's the code:
这是代码：
static func random(min: CGFloat, max: CGFloat) -> CGFloat {
return CGFloat(Float(arc4random()/0xFFFFFFFF) * (max - min) + min)
}
采纳答案by JAL
Why not reduce the complexity for the compiler by breaking the expression down into two sub-expressions?
为什么不通过将表达式分解为两个子表达式来降低编译器的复杂性？
static func random(min: CGFloat, max: CGFloat) -> CGFloat {
let rand = CGFloat(arc4random()/0xFFFFFFFF)
return (rand * (max - min) + min)
}
You can also use UINT32_MAX(or the more "Swifty" UInt32.maxor .max) in place of 0xFFFFFFFFto improve readability. If I recall, 0xFFFFFFFFis the hex value of the max value of an unsigned 32-bit Integer as defined in the <stdint.h>header.
您还可以使用UINT32_MAX（或更“Swifty”UInt32.max或.max）代替0xFFFFFFFF来提高可读性。如果我记得，0xFFFFFFFF是在<stdint.h>标题中定义的无符号 32 位整数的最大值的十六进制值。
#define UINT32_MAX 0xffffffff /* 4294967295U */
