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iOS Object-Oriented Swift Inheritance What is Inheritance?

Jeffrey Picard
Jeffrey Picard
5,010 Points

challenge task 3 of 3 for what is inheritance

It keeps telling me that I am failing this because "RoundButton" is not working. How do I get it to pass?

Button.swift
class Button {
  var width: Double
  var height: Double

  init(width:Double, height:Double){
    self.width = width
    self.height = height
  }
  class RoundButton: Button {
  var cornerRadius = 5.0
  }
}

var rounded = RoundButton(width: 10.0, height: 20.0)

1 Answer

Michael Reining
Michael Reining
10,101 Points

Hi Jeffrey,

You are very close. Just move the RoundButton class outside of the Button class.
If you try your code in the playground, you will instantly be alerted to the mistake.

I find that trying out code challenges in the Playground is the fastest way to learn.

class Button {
    var width: Double
    var height: Double

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

}


class RoundButton: Button { // move outside of Button class
    var cornerRadius = 5.0
}

var rounded = RoundButton(width: 10.0, height: 20.0)

I hope that helps,

Mike

PS: If you found the above helpful, be sure to check out my app which breaks code challenges down and really explains things so you can learn faster.

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https://itunes.apple.com/app/code!-learn-how-to-program/id1032546737?mt=8

PPS: I could not have developed the above app without going through the awesome resources on Team Treehouse. Stick with it. It is so worth it!

Jeffrey Picard
Jeffrey Picard
5,010 Points

Didnt even notice it was in the other one haha thanks!