Question

如何通过Swift中的super.init从子类修改基类属性？

考虑Base类有一个名为first name的属性，所以我希望子类添加姓氏并通过super.init传递它以下是代码

class mainClass {
    var firstname : String = "Abhinav"
    init(firstname : String){
        self.firstname = firstname
    }
    func printfirstname(){
        print(firstname)
    }
}
class subClass:mainClass {
var lastname : String

    init(lastname:String){
        self.lastname = lastname
        let name :String = firstname + lastname
        super.init(firstname:name)
    }
    func printname(){
        print(firstname)
    }

}

var subclass = subClass(lastname:"Jha")
subclass.printfirstname()

我收到错误＆＃34; 使用＆＃39; self＆＃39;在财产访问＆＃39;名字＆＃39;在super.init初始化自我之前＆＃34;

Answer 1

您正在尝试在初始化之前访问超级类的firstName。您应该先致电super.init()。它看起来像是：

init(lastname:String){
    self.lastname = lastname
    super.init(firstname: "Abhinav")
    let name = firstname + lastname
    self.firstname = name
}

如何通过Swift中的super.init从子类修改基类属性？

1 个答案: