Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Object-Oriented Swift Inheritance Inheritance and Initializers

Karthikeya Nadendla
Karthikeya Nadendla
9,747 Points

Need help to fix the code

Once again we are working with the RoundButton class and started to add a designated initializer to it. However, there's something wrong with it. Can you figure out how to fix it and make it work?

I have added the super.init in the init but still it says error and I dont understand why. Please help me on this

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

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

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

class RoundButton: Button {
  var cornerRadius: Double = 5.0

  init(width:Double,height:Double,cornerRadius:Double){

    self.cornerRadius = cornerRadius

    super.init(width: width, height: height) 

  }  
}

1 Answer

Richard Lu
Richard Lu
20,185 Points

Hi Karthikeya,

Your code is so close to being perfect. The problem is that when you define your designated initializer in your Button class, you call super.init(....). When you call super.init in your RoundButton, you're calling the parent classes initializer which is Button.

class RoundButton: Button {  /* parent class is Button aka the super */ }

In Button, there is no super class.

class RoundButton { }

If you change this line in your Button class, the error will go away.

super.init (width:Double, height:Double)

change it to

init (width:Double, height:Double)

Happy coding! :)