How to make a random color with Swift

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()

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

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()