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)     var randomColor = arc4random()      //Color Background randomly     func colorBackground() {          // TODO: set a random color         view.backgroundColor = UIColor.yellow      } } 

Answer 1

You're going to need a function to produce random CGFloats in the range 0 to 1:

extension CGFloat {     static func random() -> CGFloat {         return CGFloat(arc4random()) / CGFloat(UInt32.max)     } } 

Then you can use this to create a random colour:

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

If you wanted a random alpha, just create another random number for that too.

You can now assign your view's background colour like so:

self.view.backgroundColor = .random()