Swift randomFloat issue: '4294967295' is not exactly representable as 'Float'

As you know Float has only 24-bits of significand, so 32-bit value 0xFFFFFFFF would be truncated. So, Swift is warning to you that Float cannot represent the value 0xFFFFFFFF precisely.

The short fix would be something like this:

let randomValue: CGFloat = CGFloat(Float(arc4random()) / Float(0xFFFFFFFF))

With using Float.init explicitly, Swift would not generate such warnings.

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But the preferred way would be using random(in:) method as suggested in matt's answer:

return CGFloat(Float.random(in: from...to))

or simply:

return CGFloat.random(in: from...to)

Simplest solution: abandon your code and just call https://developer.apple.com/documentation/coregraphics/cgfloat/2994408-random.