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iOS Object-Oriented Swift Properties Getter and Setter Methods

Gabriel Jones
Gabriel Jones
4,822 Points
Posted by Gabriel Jones
Gabriel Jones
4,822 Points

Challenge Code

How can I get this to work?

Temperature.swift 
class Temperature {
    var celsius: Float = 0.0
    var fahrenheit: Float {
      get {
        return (celsius * 1.8) + 32.0
      }
      set {
        celsius = (fahrenheit-32)/1.8
      }
    }    
}

1 Answer

Kyle Pontius
Kyle Pontius
6,190 Points

Hey Gabriel,

Your solution looks great, however it's looking for the "newValue" keyword in the setter, instead of "fahrenheit". That "newValue" will represent the user's input. Your solution should be modified to look like this:

class Temperature {
    var celsius: Float = 0.0
    var fahrenheit: Float {
        get {
          return (celsius * 1.8) + 32.0
        }
        set {
          celsius = (newValue - 32) / 1.8
        }
    }    
}

Please mark this as "best answer" if it helps, so future users can reference your question.

Good luck! Kyle

Ron Gootman
Ron Gootman
24,409 Points

where are the "get" and "set" coming from? Amit mentioned nothing about it in his video regarding Computed Properties

Kyle Pontius
Kyle Pontius
6,190 Points

Great question. I actually just looked at the source code posted for that page and it was in there, I haven't actually watched that portion of the series. :)

There's a great bit of reading that may fill in the gaps: Apple Docs

Let me know if there's anything else I can do to help.

Kyle

Ron Gootman
Ron Gootman
24,409 Points

Thank you Kyle,

I actually managed to get around this challenge without it the "get" and "set". I suppose I will learn about that in the next portion of this course...