ios - Swift:UITextField Delegate 从未设置，或者方法从未被调用

Question

我正在尝试实现一个UITextFieldDelegate，它在用户按回车键时执行特定的操作。但是，尽管我从 Storyboard和 viewDidLoad 方法中设置了委托(delegate)，但从未调用委托(delegate)方法。这是我的代码:

/*UITextFieldDelegate*/
@IBOutlet weak var messageTextField: UITextField!
func textFieldDidBeginEditing(textField: UITextField) {    //delegate method

}

func textFieldShouldEndEditing(textField: UITextField) -> Bool {  //delegate method
    return false
}

func textFieldShouldReturn(textField: UITextField) -> Bool {   //delegate method
    textField.resignFirstResponder()

    //check if message isn't empty
    if let _ = textField.text?.isEmpty {

    } else {
        chatMessages.append(ChatMessage(message: (textField.text)!, dateSent: NSDate()))
        textField.text = ""
        //reload table data
        tableView.reloadData()
    }

    return true
}
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    messageTextField.delegate = self
}

Answer 1

我明白了......它真的很愚蠢。

只需在 textFieldShouldEndEditing 中返回 true 而不是 false