确保您的类扩展了UITextFieldDelegate协议

SomeViewControllerClass : UIViewController, UITextFieldDelegate

您可以执行以下操作：

override func viewDidLoad() {
    super.viewDidLoad()

    self.textField.delegate = self
}

func textFieldShouldReturn(textField: UITextField) -> Bool {

    //textField code

    textField.resignFirstResponder()  //if desired
    performAction()
    return true
}

func performAction() {   
    //action events
}