Keyboard disappear by clicking on keyboard return button

// Disappear keyboard by clicking on keyboard return-button
/* at first of all textField have to attach Outlets→delegate with view-controller
and protocal UITextFieldDelegate add with class
*/
class ViewController: UIViewController, UITextFieldDelegate{

func textFieldShouldReturn(textField: UITextField) → Bool{
textField.resignFirstResponder()
return false
}
…………
………
}