Swift expression was too complex to be solved in r

2019-01-20 09:26发布

I'm having an error when compiling a project in Xcode, it says:

Expression was too complex to be solved in reasonable time; consider breaking up the expression into distinct sub-expressions

here's the code:

static func random(min: CGFloat, max: CGFloat) -> CGFloat {
    return CGFloat(Float(arc4random()/0xFFFFFFFF) * (max - min) + min)
}

1条回答
甜甜的少女心
2楼-- · 2019-01-20 09:33

Why not reduce the complexity for the compiler by breaking the expression down into two sub-expressions?

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.max or .max) in place of 0xFFFFFFFF to improve readability. If I recall, 0xFFFFFFFF is the hex value of the max value of an unsigned 32-bit Integer as defined in the <stdint.h> header.

#define UINT32_MAX 0xffffffff  /* 4294967295U */
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