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 Properties Getter and Setter Methods

Kevin McFarland
Kevin McFarland
5,122 Points

What am I doing wrong...

Here's the directions for the challenge...

"We need to add getter and setter methods to the fahrenheit property of the Temperature class. Add a getter method to access the value of the fahrenheit property. Then add a setter method. When the user assigns a value to the fahrenheit property, the setter method will calculate and assign a value to

the celsius property. (Note: Celsius = (Fahrenheit-32/1.8))"

I've tested this code in the Swift REPL and used a calculator... and it's correct. Apparently the challenge is looking for different syntax. But I don't know what it wants. The newValue keyword doesn't seem appropriate here.

class Temperature {
    var celsius: Float = 0.0
    var fahrenheit: Float {
    get {
      return (celsius * 1.8) + 32.0

    set {
      celsius = (fahrenheit - 32) / 1.8


2 Answers

Kevin McFarland
Kevin McFarland
5,122 Points

Hi William,

Thank you... that was the solution.

William Li
William Li
Courses Plus Student 26,868 Points

You got most right, change this one line and it'll work

celsius = (newValue - 32) / 1.8

newValue keyword is appropriate here, because when you're calling the setter, you're setting a new value to it.