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 Classes and Objects Classes and Their Methods

Peter Fuhrey
Peter Fuhrey
2,146 Points

Class method challenge

Hi, I feel as though I'm missing something important here but I can't get a grasp on it. It's saying I forgot to add points to the width property.

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) -> Double {
return points + (width + height)
  }
}

1 Answer

Hi,

I think you're trying to increment width and height by the value passed into the function, points.

So, that would probably look something like:

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

That increments both the width and the height in the instance of the Button method by the value passed into the function, points. There's no return from the function because you act directly on the instance varialbes by using the self. notation.

I hope that is (1) correct and, (2), understandable!

Steve.