How to make a random color with Swift

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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()

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