How to add initializers in extensions to existing UIKit classes such as UIColor?

Question

The Swift documentation says that adding initializers in an extension is possible, and the example in the document is about adding an initializer to a struct. Xcode doe

Answer 1

Changing the parameter types will also work.

extension UIColor {

    convenience init(red: Int, green: Int, blue: Int, alpha: CGFloat) {

        let normalizedRed = CGFloat(red) / 255
        let normalizedGreen = CGFloat(green) / 255
        let normalizedBlue = CGFloat(blue) / 255

        self.init(red: normalizedRed, green: normalizedGreen, blue: normalizedBlue, alpha: alpha)
    }
}

Usage:

let newColor: UIColor = UIColor.init(red: 74, green: 74, blue: 74, alpha: 1)

I would usually forget the redundant work of dividing the component values by 255. So I made this method to facilitate me.