iOS Swift UIColor extension

UIColor+Random.swift

import UIKit

extension UIColor {
    class func randomColor() -> UIColor {
        let red = CGFloat(arc4random() % 256) / 256.0
        let green = CGFloat(arc4random() % 256) / 256.0
        let blue = CGFloat(arc4random() % 256) / 256.0
        let alpha = CGFloat(arc4random() % 256) / 256.0
        return UIColor(red: red, green: green, blue: blue, alpha: alpha)
    }
}

divisor should be: 255.0
because never be 1.0 channel value

let red = CGFloat(arc4random() % 256) / 255.0
let green = CGFloat(arc4random() % 256) / 255.0
let blue = CGFloat(arc4random() % 256) / 255.0
let alpha = CGFloat(arc4random() % 256) / 255.0