Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Object-Oriented Swift Inheritance Inheritance and Initializers

yi yuan
yi yuan
2,436 Points

where am I wrong at the course of "init in subclass"

I think I hit the points during the tutorial, but I can't figure where I am wrong. Any help will be appreciated!

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

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

1 Answer

class RoundButton: Button {
  var cornerRadius: Double = 5.0

  init(width:Double,height:Double,cornerRadius:Double){
    self.cornerRadius = cornerRadius
    super.init(width: width, height: height)
  }  
}
yi yuan
yi yuan
2,436 Points

Thanks, it works! But I just got confused because the tutorial seems only have one parameter when the subclass init if I remember right.