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iOS Object-Oriented Swift Classes and Objects Classes and Their Methods

Eric Mentele
Eric Mentele
7,325 Points

Why won't width allow points to be added?

It keeps saying that I need to add points to width within the method. This is what I have right now:

func incrementBy(points: Double) -> (width: Double, height: Double) {

return (width + points, height + 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: Double, height: Double) {

  return (width + points, height + points) 
  }
}

2 Answers

I tried your code in a Swift Playground and it works, so I think this is just an example of Treehouse preferring a specific answer to pass the quiz.

I was able to complete the quiz by not returning the values, but instead mimicking what we saw in the previous video. Following Amit's example, I simply updated the values by adding points to the existing stored values. So width = width + points.

Both solutions work in the Swift Playground, but their automated grading system prefers this solution.

Hope that helps!

Eric Mentele
Eric Mentele
7,325 Points

Thank you! I was not sure that this question posted. I figured that out after re-watching the video. Realized I was creating new values only relevant to the function rather than changing the class's properties values. This was my answer:

func incrementBy(points: Double) {

    width += points
    height += points

}

Awesome! Glad that worked. Great shorthand with the += operator!