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

Posted by azumi yuan
azumi yuan
3,126 Points

what am i doing wrong, can someone help me??

We need to provide a means to increase the size of our Button. So we are going to add a method named incrementBy which will accept a parameter named points. (Within the method add points to the width and height properties).

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 width = width * points 
     return height = height * points
  }

}

1 Answer

William Li
PLUS
William Li
Courses Plus Student 26,868 Points
William Li
William Li
Courses Plus Student 26,868 Points

Hello, azumi yuan There're several places you need to make change to in your incrementBy method.

  • some methods/functions have no return type, incrementBy is one of those, it just performs increment operation on 2 variables, and it need not return anything. Therefor, -> Double should be deleted.
  • delete the return keyword as well.
  • increment is an addition operation, no multiplication, change * to +.
  func incrementBy (points: Double) {
     width = width + points 
     height = height + points
  }

Now this method should pass the challenge.