Swift: 从未设置 UITextField 委托，或从未调用过方法

Question

我正在尝试实现一个 UITextFieldDelegate，它会在用户按下 return 时执行特定操作。但是，尽管我从情节提要和 viewDidLoad 方法中都设置了委托，但从未调用过委托方法。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

我想出来了……真是傻逼

只是 return true 而不是 textFieldShouldEndEditing

中的 false

Swift: 从未设置 UITextField 委托，或从未调用过方法

Swift: UITextField Delegate is never set, or the methods are never called

uitextfield

ios

swift