iOS Swift UITextField with Padding and Underline

import UIKit

class ViewController: UIViewController {
    
    var dateTextField: UITextField?

    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.navigationItem.title = "Main View"
        
        //create the UITextfield with Padding and Underline
        createUITextField()
        
    }
    
    func createUITextField(){
        
        let myLabel = UILabel()
        myLabel.textColor = UIColor.black
        myLabel.text = "Enter Date: "
        myLabel.font = UIFont.systemFont(ofSize: 24.0)
        myLabel.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(myLabel)
        
        let myLabel2 = UILabel()
        myLabel2.textColor = UIColor.brown
        myLabel2.text = " (MM/DD/YY) "
        myLabel2.font = UIFont.systemFont(ofSize: 24.0)
        myLabel2.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(myLabel2)
        
        dateTextField = MyTextField()
        dateTextField?.text = "Select a date ..."
        dateTextField?.textColor = UIColor.black
        dateTextField?.font = UIFont.systemFont(ofSize: 24.0)
        dateTextField?.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(dateTextField!)
        
        var allConstraints: [NSLayoutConstraint] = []
        let views = ["view": view!, "myLabel": myLabel, "dateTextField": dateTextField, "myLabel2": myLabel2]
        
        let horizontalConstraints = NSLayoutConstraint.constraints(
            withVisualFormat: "H:|-[myLabel]-[dateTextField(200)]-[myLabel2]-(>=10)-|",
            options: [.alignAllTop, .alignAllBottom], metrics: nil, views: views as [String : Any])
        allConstraints += horizontalConstraints
        
        var verticalConstraints = NSLayoutConstraint.constraints(
            withVisualFormat: "V:|-(>=40)-[myLabel]", metrics: nil, views: views as [String : Any])
        allConstraints += verticalConstraints
        verticalConstraints = NSLayoutConstraint.constraints(
            withVisualFormat: "V:|-(>=40)-[dateTextField]", metrics: nil, views: views as [String : Any])
        allConstraints += verticalConstraints
        verticalConstraints = NSLayoutConstraint.constraints(
            withVisualFormat: "V:|-(>=40)-[myLabel2]", metrics: nil, views: views as [String : Any])
        allConstraints += verticalConstraints
        
        
        NSLayoutConstraint.activate(allConstraints)
        
    }
    
    //call underline function here
    override func viewDidLayoutSubviews() {
        
        let lineColor = UIColor(red:0.12, green:0.23, blue:0.35, alpha:1.0)
        dateTextField?.underline(borderColor: lineColor)
        
    }
    
    
}

//extension to create Underline function
extension UITextField {
    
    func underline(borderColor: UIColor) {
        
        self.borderStyle = UITextField.BorderStyle.none
        self.backgroundColor = UIColor.clear
        
        let borderLine = UIView()
        let height = 2.0
        borderLine.frame = CGRect(x: 0, y: Double(self.frame.height) - height, width: Double(self.frame.width), height: height)
        
        borderLine.backgroundColor = borderColor
        self.addSubview(borderLine)
    }
    
}

//Override class to create padding
class MyTextField: UITextField {
    
    let padding = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
    
    override open func textRect(forBounds bounds: CGRect) -> CGRect {
        return bounds.inset(by: padding)
    }
    
    override open func placeholderRect(forBounds bounds: CGRect) -> CGRect {
        return bounds.inset(by: padding)
    }
    
    override open func editingRect(forBounds bounds: CGRect) -> CGRect {
        return bounds.inset(by: padding)
    }
}