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iOS

Posted by Arsene Lavaux
Arsene Lavaux
4,342 Points

Error in overriding swift function

This code to answer the method overriding challenge in swift gives me an error although I am calling the base class method using "super". Any ideas why? Thanks!

class Button { var width: Double var height: Double

init(width:Double, height:Double) { self.width = width self.height = height }

func incrementBy(points: Double) { width += points height += points } }

class RoundButton: Button { var cornerRadius: Double = 5.0
override func incrementBy(points: Double = 7.0) { super.incrementBy(points) } }

5 Answers

jcorum
jcorum
71,830 Points

Arsene, when I put your code in an Xcode playground it runs without error.

class Button {
    var width: Double
    var height: Double

    init(width:Double, height:Double) {
        self.width = width
        self.height = height
    }

    func incrementBy(points: Double) {
        width += points
        height += points
    }
}

class RoundButton: Button {
    var cornerRadius: Double = 5.0

    override func incrementBy(points: Double = 7.0) {
        super.incrementBy(points)
    }
}

let rb = RoundButton(width: 5, height: 12)
rb.cornerRadius  //5
rb.width //5
rb.height  //12
rb.incrementBy(5)
rb.width  //10
rb.height //17

Just to test it I created a RoundButton object, displayed its properties, and then incremented it by 5.

As it happens, I got the same result with the overridden method commented out.

Arsene Lavaux
Arsene Lavaux
4,342 Points

Thanks @jcorum: It does work for me too. Here is the example when I don't pass any argument to the function (which passes the 7 default value). All works! So there must be some sort of bug with this challenge? Anyone else experienced same issue?

Here is code:

'''swift

// Challenge Team Treehouse Override Method

import UIKit

class Button { var width: Double var height: Double

init(width:Double, height:Double) {
    self.width = width
    self.height = height
}

func incrementBy(points: Double) {
    width += points
    height += points
}

}

class RoundButton: Button { var cornerRadius: Double = 5.0

override func incrementBy(points: Double = 7.0) {
    super.incrementBy(points)
}

}

let rb = RoundButton(width: 5, height: 12) rb.cornerRadius //5 rb.width //5 rb.height //12 rb.incrementBy() rb.width //12 rb.height //19

'''

Arsene Lavaux
Arsene Lavaux
4,342 Points
Arsene Lavaux
Arsene Lavaux
4,342 Points

Apologize for poor formating, it's been a while since I last checked this forum. Hope someone can properly edit it.

Thanks!

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

P.S., to put your code in correctly you type 3 accent marks (on a mac keyboard the same key as the tilde) followed by the type of code (here swift), then a blank line, then the code, then 3 accent marks on the next line and then another blank line.

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

Arsene, the key you use is the so-called accent grave `, not the accent acute '

Arsene Lavaux
Arsene Lavaux
4,342 Points
Arsene Lavaux
Arsene Lavaux
4,342 Points

Thanks @jcorum, you are probably right. And well versed in French accents! Bravo! We should connect on LinkedIn if you are open to it. I am always looking to connect with digital leaders, every day :) Synergies always come up along the way...