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iOS

Ryan Maneo
Ryan Maneo
4,342 Points
Posted by Ryan Maneo
Ryan Maneo
4,342 Points

Stuck on class inheritance...

I don't understand... this should work... right?

class Vehicle {

    var wheels: Int
    init(wh: Int) {
        self.wheels = wh
    }


class Car: Vehicle {
 override var wheels: Int = 4
}
}

returns error: cannot override with a stored property 'wheels'

I've tried it many different ways... all return some type of error. And yes, I read the documentation.

Jennifer Nordell
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.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher
Jennifer Nordell
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Could you post a link to the challenge? The one I've found looks quite a bit different. What I can tell you right off the bat though is that you've started a class definition inside your first class definition. Take a close look at the curly braces.

2 Answers

Jennifer Nordell
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.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher
Jennifer Nordell
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

To be honest, I'm not that amazing with Swift. And part of that is because my Mac died a few months back. However, I've played some in the Swift sandbox and this is what I came up with. Take a look at this on your machine and see if it works like you're wanting. Hope this helps! :sparkles:

class Vehicle {

    var wheels: Int = 2
    init(wh: Int) {
        self.wheels = wh
    }
}

class Car: Vehicle {
    override init(wh: Int)
    {
        super.init(wh: 4)
        self.wheels = 4
    }
}

let myCar = Car(wh:8)
print(myCar.wheels)

note even if you try to construct the Car with 8 wheels as shown here, it will still be set to 4 :smiley:

Ryan Maneo
Ryan Maneo
4,342 Points
Ryan Maneo
Ryan Maneo
4,342 Points

Hm... okay... I guess I have to override the initializer, not the stored property?

Ryan Maneo
Ryan Maneo
4,342 Points
Ryan Maneo
Ryan Maneo
4,342 Points

Jennifer Cordell This isn't a challenge actually. I am just trying to understand Classes and Class inheritance and doing private practice... also, That was on purpose... I tried it inside of it, outside of it, inside of a struct, without the initializer, without a value, with a value, as a constant... I just don't understand... is it just me? Ugh!