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iOS Object-Oriented Swift Inheritance Inheritance and Initializers

Posted by Sinan Samet
Sinan Samet
3,677 Points

I can't solve this problem I don't see where the error is.

I see errors in the log but I can't find the mistake.

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

  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:Double, height:Double)
  }  
}

1 Answer

Steve Hunter
Steve Hunter
57,712 Points

You need to call the super first:

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

Hope that helps!

Steve.

Sinan Samet
Sinan Samet
3,677 Points

Thanks it was also because I had "width: Double" instead of "width: width"

John Simoneau
John Simoneau
9,326 Points
John Simoneau
John Simoneau
9,326 Points

While the answer is "correct" to pass the question... I'm confused because in the video, he says that you always want to call the super.init() AFTER the self.cornerRadius...