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iOS Object-Oriented Swift Properties Getter and Setter Methods

Posted by James Jarrett
James Jarrett
4,316 Points

What am I doing wrong?

this looks like it should be correct.

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

2 Answers

notf0und
notf0und
11,940 Points

You're forgetting to use the special keyword newValue in your setter method.

Replacing fahrenheit with newValue should work.

set {
    celsius = (newValue - 32) / 1.8
}

But why does this work? How does it know that the newValue is fahrenheit? Easy! In the getter method, you return the value of fahrenheit, and the setter method looks to that returned value for the newValue.

Hope that helps!

James Jarrett
James Jarrett
4,316 Points

Dang I completely overlooked that, thanks for you help.

Brent Petit
Brent Petit
7,860 Points
Brent Petit
Brent Petit
7,860 Points

Are you seeing errors or just incorrect values? If it's just values, I believe you are looking for 

set {
   celsius = ((fahrenheit - 32.0) / 1.8)
}

in the setter.

James Jarrett
James Jarrett
4,316 Points

it says that it isn't assigning the correct value.