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 Inheritance What is Inheritance?

Emmet Lowry
Emmet Lowry
10,196 Points
Posted by Emmet Lowry
Emmet Lowry
10,196 Points

Hi i'm stuck on the last challenge of inheritance. It asks me to Create an instance of the class RoundButton and ...

name the instance rounded. I thought i answered it correctly but it wont let me pass it help is appreciated.

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

  init(width:Double, height:Double){
    self.width = width
    self.height = height
  }
  class RoundButton : Button {
  var cornerRadius = 5.0
  }
}

var rounded = RoundButton(width: 12, height: 15)

7 Answers

james white
james white
78,399 Points
james white
james white
78,399 Points

Like this:

class Button {
  var width: Double
  var height: Double

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

class RoundButton : Button {
  var cornerRadius = 5.0
 }

var rounded = RoundButton(width: 12, height: 15)
Emmet Lowry
Emmet Lowry
10,196 Points
Emmet Lowry
Emmet Lowry
10,196 Points

Yes that should work

Brendan Gilbreath
Brendan Gilbreath
2,420 Points
Brendan Gilbreath
Brendan Gilbreath
2,420 Points

Your RoundButton class should be outside of the inherited class.

Jack Bonner
Jack Bonner
1,093 Points
Jack Bonner
Jack Bonner
1,093 Points

Remember your RoundButton class is a Sub Class to Button. So take it outside of the Super Class (Button) and you should be good to go.

Emmet Lowry
Emmet Lowry
10,196 Points
Emmet Lowry
Emmet Lowry
10,196 Points

Is what I've written right apart from the RoundButton class being inside the super class Button. Thanks for help

Emmet Lowry
Emmet Lowry
10,196 Points
Emmet Lowry
Emmet Lowry
10,196 Points

actually fixed it thanks for help

Jack Bonner
Jack Bonner
1,093 Points
Jack Bonner
Jack Bonner
1,093 Points

Glad you got it working! You wrote it correctly, just needed to put the RoundButton class below the brackets of the Button class.