Question

我有一个无法覆盖功能的问题。

我的父母在下面的课：

class A: UIViewController {

 func parentalGate() {

        let appearance = SCLAlertView.SCLAppearance(
            kTitleFont: UIFont(name: "Futura", size: 20)!,
            kTextFont: UIFont(name: "Futura", size: 14)!,
            kButtonFont: UIFont(name: "Futura", size: 14)!,
            showCloseButton: false
        )
        let alert = SCLAlertView(appearance: appearance)
        let alert2 = SCLAlertView(appearance: appearance)

        if (UserDefaults.standard.object(forKey: "language") as? String == "english") {

            let txt = alert.addTextField("Enter third letter")

            alert.addButton("Done") {

                if ((txt.text == "P") || (txt.text == "p")) {

                    self.parentalGatefunctions()
                } else {
                    alert2.addButton("Close", target: SCLAlertView(), selector: #selector(SCLAlertView.hideView))
                    alert2.showError("Incorrect letter entered", subTitle: "Try again")
                }
            }

            alert.addButton("Close", target: SCLAlertView(), selector: #selector(SCLAlertView.hideView))

            alert.showWarning("We need to be sure that You are an adult", subTitle: "Enter the third letter of word: HAPPY")

        }
}

func parentalGatefunctions(){

        // Parental gate functions are overriten in classes where they are used for
    }

}

以下子类：

class B: A {


    @IBAction func unlockAllCategoriesBtnPressed(_ sender: Any) {

        A().parentalGate()
    }

    override func parentalGatefunctions() {

        print ("Do something in class B")
    }
}

另一堂课：

class C: A {


    @IBAction func unlockAllCategoriesBtnPressed(_ sender: Any) {

        A().parentalGate()
    }

    override func parentalGatefunctions() {

        print ("Do something in class C")
    }

}

一直在类B和C中调用parentalGate（）方法时，仅在类中不调用不带overriten方法的空parentalGateFunctions（）。

我做错什么了吗？我只是想避免在我的课堂上重复代码。

谢谢！

Answer 1

您的错误在这里。

@IBAction func unlockAllCategoriesBtnPressed(_ sender: Any) {
    A().parentalGate()
}

由于您已经继承了A，因此可以使用该方法。因此，只需在您的子类中调用该方法，而不是在超类的新实例中调用该方法即可！（显然会调用空方法）

@IBAction func unlockAllCategoriesBtnPressed(_ sender: Any) {
    parentalGate()
}

未调用重写方法

1 个答案: