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iOS Object-Oriented Swift Inheritance Overriding Methods

wilsonkwan
wilsonkwan
3,174 Points

stuck in this challenge

Below is my code for this challenge. However I'm no way to pass it :( P/S: I seem to be having problem on the coding console to0. Sometime it's no responding when click or typing on the console. It's a bug or just to me? Thanks

class Button { var width: Double var height: Double

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

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

class RoundButton: Button { var cornerRadius: Double = 5.0

override func incrementBy(_ points: Double = 7.0) { super.incrementBy(points)

} }

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

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

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

class RoundButton: Button {
  var cornerRadius: Double = 5.0
}

1 Answer

Dominic Bryan
Dominic Bryan
14,452 Points

Hi @wilsonkwan, you don't need the term super as override writes over the super version with a default value, hence why we set points to 7.0. Apart from that the function is the same so the contents is the same, effectively the only thing you needed was to set its default value. Here is the code:

class Button {
  var width: Double
  var height: Double

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

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

class RoundButton: Button {
  var cornerRadius: Double = 5.0
  override func incrementBy(_ points: Double = 7.0){
    width += points
    height += points
  }
}

Hope this helps

Dom