首先，引用UITextFieldDelegate類

override func viewDidLoad() {
        super.viewDidLoad()
text.delegate = self
}

//點擊return 收回鍵盤
   func textFieldShouldReturn(textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
//點擊其他地方  收回鍵盤
    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
        text.resignFirstResponder()
    }