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iOS Object-Oriented Swift Inheritance Inheritance and Initializers

Sahit penmatcha
Sahit penmatcha
4,555 Points

Whats wrong with this code?

I cant find the problem

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 

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

1 Answer

William Li
PLUS
William Li
Courses Plus Student 26,867 Points

Hi, Sahit penmatcha Have you made any changes to the original code template provided by the challenge? I don't see any, perhaps I'm missing sth here.

anyhow, for this challenge, the problem of the code is that the init method in the RoundButton class was passed in 3 arguments, cornerRadius is okay, but for the other two, you need to call in the init method from its super class to initialize them.

class RoundButton: Button {
  var cornerRadius: Double = 5.0

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

Hope it helps.