Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Object-Oriented Swift Inheritance Inheritance and Initializers

becky hayes
becky hayes
2,226 Points
Posted by becky hayes
becky hayes
2,226 Points

Not sure why the edits i've made to the init arent compiling...seem to be a lot of errors..

I've tried to call the init from the super class.. but it doesnt seem to be working!

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

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

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

class RoundButton: Button {
  var cornerRadius: Double = 5.0

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

1 Answer

Reed Carson
Reed Carson
8,306 Points
Reed Carson
Reed Carson
8,306 Points 
 init(subInitWidth: Double, subInitHeight: Double, cornerRadius: Double){

        self.cornerRadius = cornerRadius

        super.init(width: subInitWidth, height: subInitHeight)

the initializer for the subclass needs to gather values to pass into the super init because the subclass initializer is what will be called when you make an instance of it, not the super one.