How to make a random color with Swift

Question

How I can make a random color function using Swift?

import UIKit

class ViewController: UIViewController {

    var randomNumber = arc4random_uniform(20)
            


        

Answer 1

func anotherGetRandomColor()->UIColor{

    let newRed   = Double(arc4random_uniform(256))/255.0
    let newGreen = Double(arc4random_uniform(256))/255.0
    let newBlue  = Double(arc4random_uniform(256))/255.0

    return UIColor(red: CGFloat(newRed), green: CGFloat(newGreen), blue: CGFloat(newBlue), alpha: 1.0)
}

Answer 2

Make a function to generate random color:

func getRandomColor() -> UIColor {
     //Generate between 0 to 1
     let red:CGFloat = CGFloat(drand48())   
     let green:CGFloat = CGFloat(drand48()) 
     let blue:CGFloat = CGFloat(drand48())  

     return UIColor(red:red, green: green, blue: blue, alpha: 1.0)
}

Now, you can call this function whenever you need random color.

self.view.backgroundColor = getRandomColor()

Answer 3

For random solid colors you can use UIColor HSB initializer and randomize only the hue:

extension UIColor {
    static var random: UIColor {
        return .init(hue: .random(in: 0...1), saturation: 1, brightness: 1, alpha: 1)
    }
}

---

let color1: UIColor = .random
let color2: UIColor = .random
let color3: UIColor = .random
let color4: UIColor = .random
let color5: UIColor = .random

---

Answer 4

Swift 5.1

Make This function and generate Random color.

e.g. view.backgroundColor = random()

func random() -> UIColor {
        return UIColor(red: .random(in: 0...1),
                       green: .random(in: 0...1),
                       blue: .random(in: 0...1),
                       alpha: 1.0)
    }

Answer 5

With Swift 4.2, you can simplify this by using the new random functions which have been added:

extension UIColor {
  static func random () -> UIColor {
    return UIColor(
      red: CGFloat.random(in: 0...1),
      green: CGFloat.random(in: 0...1),
      blue: CGFloat.random(in: 0...1),
      alpha: 1.0)
  }
}

There are more details here.

Answer 6

For Swift 4.2

extension UIColor {
    static var random: UIColor {
        return UIColor(red: .random(in: 0...1),
                       green: .random(in: 0...1),
                       blue: .random(in: 0...1),
                       alpha: 1.0)
    }
}

For Swift 3 and above:

extension CGFloat {
    static var random: CGFloat {
        return CGFloat(arc4random()) / CGFloat(UInt32.max)
    }
}

extension UIColor {
    static var random: UIColor {
        return UIColor(red: .random, green: .random, blue: .random, alpha: 1.0)
    }
}

Usage:

let myColor: UIColor = .random