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iOS Object-Oriented Swift Inheritance What is Inheritance?

Paul Denlinger
Paul Denlinger
2,380 Points

Incorrect answer for instance of RoundButton

Am not quite sure what is wrong with this answer about creating an instance of RoundButton. Can you please tell me what is wrong?

Thanks in advance!

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(20.0, 10.0)
}
Paul Denlinger
Paul Denlinger
2,380 Points

I have tried out your answer in Xcode Playground, and there are no problems, but when I put it in the Treehouse browser, it gives me an error. When I click on Preview to ask what is wrong, it doesn't show any code. Any suggestions?

Greg Kaleka
Greg Kaleka
39,021 Points

Paul - I would refresh the page. This exact code worked for me, so if refreshing doesn't work, double check your code (all the little stuff like brackets matters a lot!).

Challenge passed screenshot

1 Answer

Greg Kaleka
Greg Kaleka
39,021 Points

Hi Paul - it looks like you need to double check your curly braces, and then name the parameters in your RoundButton initializer.

This should work:

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: 20.0, height: 10.0)
Paul Denlinger
Paul Denlinger
2,380 Points

Found the problem: it was a closing brace problem. Thank you!