Swift extension example

Question

I was originally wanting to know how to make something like this

UIColor.myCustomGreen

so that I could define my own colors and use them th

Answer 1

Underline text in UITextField

Used in function ViewDidLoad()

firstNametext.underlined(0.5)

Extension

extension UITextField {

    func underlined(_ size:Double){
        let border = CALayer()
        let width = CGFloat(size)
        border.borderColor = UIColor.red.cgColor
        border.frame = CGRect(x: 0, y: self.frame.size.height - width, 
        width:  self.frame.size.width, height: self.frame.size.height)
        border.borderWidth = width
        self.layer.addSublayer(border)
        self.layer.masksToBounds = true }
    }
}