how to change border color of text field in swift

I am trying to change border color of a text label, i cant find any option to change it in Main(base) and the code i am using in viewController is:

`

              import UIKit

              class ViewController: UIViewController {

               @IBOutlet weak var textsa: UITextField!
               override func viewDidLoad() {
               super.viewDidLoad()
               textsa.layer.backgroundColor = CGColor(red: 23, green: 23, blue: 23, alpha: 12.3)
           } 


       }

`

>Solution :

You have to set borderColor and borderWidth for textfield layer.

        textsa?.layer.borderColor = UIColor.red.cgColor
        textsa?.layer.borderWidth = 2.0