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iOS Object-Oriented Swift Properties Getter and Setter Methods

becky hayes
becky hayes
2,226 Points
Posted by becky hayes
becky hayes
2,226 Points

Think i have the bulk of this Get Set code right but clearly missing something in the detail!

Not sure why it isnt compiling the get set code

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

Michael Reining
Michael Reining
10,101 Points
Michael Reining
Michael Reining
10,101 Points

Hi Becky,

You are very close.

Setters have a special variable scoped within them called newValue.

That is the default name for whatever new value is sent to the setter.

So you have to use that instead of fahrenheit in your code 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 // use newValue
        }

    }
}

Still confused, you can get more details here: http://www.codingexplorer.com/computed-properties-in-swift/

I hope that helps,

Mike

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https://itunes.apple.com/app/code!-learn-how-to-program/id1032546737?mt=8

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