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iOS Object-Oriented Swift Inheritance Inheritance and Initializers

Karthikeya Nadendla
Karthikeya Nadendla
9,747 Points
Posted by 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
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! :)