(-1)^k with random k between 0 and 1 swift

I want to have something to happen when (-1)^k is 1 and when its -1 -> k is generated randomly.

I tried this but it doesnt work

let test:Int32 = -1
let leftOrRight:CGFloat = pow(CGFloat(test),random(min:0,max:1))

func random(min : CGFloat, max : CGFloat) -> CGFloat{
    return random() * (max - min) + min
}

leftOrRight is always NaN :(

I appreciate any help :)