在具有代理的视图控制器之间传递多个值

我成功地在具有委托函数的视图控制器之间传递了一段数据(一个字符串变量、一个Int变量等)。然而,我还没有通过委托函数传递各种数据。

我得到以下错误:

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x7faea770db60> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key receivingAmountLabel.'

如果我删除 receingAmountLabel ,错误将转到另一个UI元素。如果我去掉那个元素,它会继续到另一个。

所有UI元素按其应有的方式连接。相关代码如下所示:

FirstVC。敏捷的 类FirstVC:UIViewController、DataSentDelegateMax{

@IBOutlet weak var receivingStringLabel: UILabel!
@IBOutlet weak var receivingAmountLabel: UILabel!

func userDidEnterData(stringData: String, amountData: Int) {
    receivingStringLabel.text = stringData
    receivingAmountLabel.text = String(amountData)
}


override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if (segue.identifier == "showSecondVC") {
        let secondVC = segue.destination as! SecondVC
        secondVC.delegate = self
    }
}

第二个VC。敏捷的

protocol DataSentDelegateMax {
    func userDidEnterData(stringData: String, amountData: Int)
}

    @IBOutlet weak var stringTF: UITextField!
    @IBOutlet weak var amountTF: UITextField!

    var delegate: DataSentDelegateMax? = nil

    @IBAction func sendButtonAction(_ sender: Any) {
        if delegate != nil {
            if (stringTF.text != nil) {
                if (Int(amountTF.text!) != nil) {
                    let stringData = stringTF.text
                    let amountData = Int(amountTF.text!)
                    delegate?.userDidEnterData(stringData: stringData!, amountData: amountData!)
                    dismiss(animated: true, completion: nil)
                }
            }
        }
    }

当我试图在代理中传递字典时,也会遇到同样的问题。