How set swift 3 UITextField border color?

You also need to set border width, because your border color is set already but your default border width is 0.0 so you can’t see it.

So, set border width something like,

  email.layer.borderWidth = 1.0

Update :

Your code should be like,

 @IBOutlet weak var email: UITextField!
 @IBOutlet weak var pass: UITextField!

 override func viewDidLoad() {
   super.viewDidLoad()

   let myColor = UIColor.white
   email.layer.borderColor = myColor.cgColor
   pass.layer.borderColor = myColor.cgColor

   email.layer.borderWidth = 1.0
   pass.layer.borderWidth = 1.0

}