// Called when 'return' key pressed

    func textFieldShouldReturn(textField:UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
    
    // Called when the user clicks on the view outside of the UITextField

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(true)
    }

// Also:
// (1) Add "UITextFieldDelegate" to the class definition

class ViewController: UIViewController, UITextFieldDelegate {

// (2) Add the following line to the body of function viewDidLoad()

nameField.delegate = self