Generating random UIColor in Swift

generateRandomColor.swift

func generateRandomColor() -> UIColor {
  let hue : CGFloat = CGFloat(arc4random() % 256) / 256 // use 256 to get full range from 0.0 to 1.0
  let saturation : CGFloat = CGFloat(arc4random() % 128) / 256 + 0.5 // from 0.5 to 1.0 to stay away from white
  let brightness : CGFloat = CGFloat(arc4random() % 128) / 256 + 0.5 // from 0.5 to 1.0 to stay away from black
        
  return UIColor(hue: hue, saturation: saturation, brightness: brightness, alpha: 1)
}

Here's another version, but with optional parameters:

import UIKit

extension UIColor {
    
    static func random(hue: CGFloat = CGFloat.random(in: 0...1),
                       saturation: CGFloat = CGFloat.random(in: 0.5...1), // from 0.5 to 1.0 to stay away from white
                       brightness: CGFloat = CGFloat.random(in: 0.5...1), // from 0.5 to 1.0 to stay away from black
                       alpha: CGFloat = 1) -> UIColor {
        return UIColor(hue: hue, saturation: saturation, brightness: brightness, alpha: alpha)
    }
}