for the user

Hiding the keyboard with the return button.

class MyViewController: UIViewController, UITextFieldDelegate {

  @IBOutlet weak var someTextField: UITextField!

  override func viewDidLoad() {
    super.viewDidLoad()

    self.someTextField.delegate = self
  }

  func textFieldShouldReturn(textField: UITextField) -> Bool {
    self.view.endEditing(true)
    return false
  }

}

Hiding the keyboard when touching somewhere on the screen.

class MyViewController: UIViewController, UITextFieldDelegate {

  @IBOutlet weak var someTextField: UITextField!

  override func viewDidLoad() {
    super.viewDidLoad()

    self.someTextField.delegate = self
  }

  override func touchesBegan(touches: Set, withEvent event: UIEvent?) {
    someTextField.resignFirstResponder()
    self.view.endEditing(true)
  }

}