How to add underline to UITextField in Swift 3

UITextField Underlined In Swift 3

Create a custom UITexField and add this method to it then override

layoutSubviews() and call it from there

    func underlined(){
        let border = CALayer()
        let lineWidth = CGFloat(0.3)
        border.borderColor = UIColor.lightGray.cgColor
        border.frame = CGRect(x: 0, y: self.frame.size.height - lineWidth, width:  self.frame.size.width, height: self.frame.size.height)
        border.borderWidth = lineWidth
        self.layer.addSublayer(border)
        self.layer.masksToBounds = true
    }

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