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iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

Michael Murray
Michael Murray
6,037 Points
Posted by Michael Murray
Michael Murray
6,037 Points

Stuck on initialization of struct in Object-Oriented challenge

I am not getting any complaints from my Swift editor, but the challenge is not recognizing my initialization: struct RGBColor { let red: Double let green: Double let blue: Double let alpha: Double let description: String

init (red: Double, green: Double, blue: Double, alpha: Double,
          description: String) {
    self.red = red
    self.green = green
    self.blue = blue
    self.alpha = alpha
    self.description = description
    }

}

structs.swift 
struct RGBColor {
    let red: Double
    let green: Double
    let blue: Double
    let alpha: Double

    let description: String

    // Add your code below
    init (red: Double, green: Double, blue: Double, alpha: Double,
              description: String) {
        self.red = red
        self.green = green
        self.blue = blue
        self.alpha = alpha
        self.description = description
        }
}
noreenqureshipowley
seal-mask
.a{fill-rule:evenodd;}techdegree
noreenqureshipowley
iOS Development Techdegree Student 1,096 Points
noreenqureshipowley
.a{fill-rule:evenodd;}techdegree
noreenqureshipowley
iOS Development Techdegree Student 1,096 Points

I was stuck on this part too. Now with the answer below it seems a little obvious (doh!). The way the code was initially presented, it didn't look like --

let description: String

--was part of the struct. So I went about sticking description in different places wondering why it wasn't working with code like --

let description: String = "(RGBColor(red: init.red, green: green, blue: blue, alpha: alpha))"

or

description: String = "(RGBColor(red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0))"

I was placing this outside of init but within the struct. No wonder it didn't work.

1 Answer

jcorum
jcorum
71,830 Points

Good start, but description needs to be initialized to a String that uses String interpolation to display the values of the color and alpha properties:

    init(red: Double, green: Double, blue: Double, alpha: Double) {
        self.red = red
        self.green = green
        self.blue = blue
        self.alpha = alpha
        description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)"
    }