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iOS Object-Oriented Swift Inheritance Overriding Methods

Jan Vrzal
Jan Vrzal
3,687 Points
Posted by Jan Vrzal
Jan Vrzal
3,687 Points

So where is the problem ?

Please help. I don what is wrong..

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

   override func incrementBy(points: Double = 7.0){
    width += points
    height += points
  }
}

1 Answer

Steve Hunter
Steve Hunter
57,712 Points

Hi there,

I found this to work:

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

Although this works just as well:

  override func incrementBy(_ points: Double = 7.0){
    width += points
    height += points
  }

The underscore seems to be the issue.

I've been having problems implementing this in the new Swift versions, though, so there may have been some alterations to the language which I'm sure will be covered in other courses (or it may just be me!!).

Steve.