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 Properties Getter and Setter Methods

Alex Bruce
Alex Bruce
1,622 Points

Please take a look at my code and tell me whats up.

Please just tell me what I did wrong?

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

1 Answer

You're pretty close here. Your get method works great, it accesses the value and returns it. Your set method however is fundamentally incorrect. When writing a set method, you must remember that a value inside of this class is going to be changed by an outside source. Your current setup will just return a value, which is what a get method would do. To properly use the set method, you'll need to assign the argument given externally to a variable inside your class, and in this case it's your celsius variable.

So you know that you'll start your set method like this -

celsius = 

Now you'll need to remember the default name of the argument passed in, which is newValue. so celsius = newValue is the gist of what you need, but that's still not the correct answer. This is where it gets a little tricky, because you need to calculate the newValue passed in to convert it to Celsius. The formula for this is Celsius = (Fahrenheit - 32) / 1.8 (as per the challenge description).

Since you are converting a Fahrenheit number to a Celsius number with this setter method, do you see which part needs to be replaced with newValue? Try that, and if done properly, you should have your solution!