Swift Initializer of a Class

Question

I've started to learn swift a couple days ago and i come from a java/c++ background. However this piece of a code has a mistake that i cant seem to be able to fix.

class Student
{
    var number:Int
    var name:String
    var course:String

    init(_ name:String,_ number:Int, _ course:String)
    {
        self.number = number
        self.name = name
        self.course = course
    }

    func write()
    {
        print("Name:",self.name)
        print("Number:",self.number)
        print("Course:",self.course)
    }
}

class ExchangeStudent:Student
{
    var country:String

   init(_ name:String,_ number:Int, _ course:String, _country:String)
    {
        super.init(name,number,course)
        self.country = country
    }

}

However i get the following error:

property 'self.country' not initialized at super.init call

And i don't really understand how i can solve it

please, use proper Swift code style, this code hurts my eyes :( — J. Doe, Apr 24 '20 at 09:34

score 1 · Answer 1 · answered Apr 24 '20 at 09:32

1

The call to super.init needs to come after you have initialised all extra properties added by the subclass.

class ExchangeStudent: Student {
    var country:String

    init(_ name:String,_ number:Int, _ course:String, _ country:String) {
        self.country = country
        super.init(name,number,course)
    }

}

answered Apr 24 '20 at 09:32

Dávid Pásztor

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ahhhh, that was what i was missing. Thanks a lot! – Maytweeer Apr 24 '20 at 09:34

Swift Initializer of a Class

1 Answers1