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iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

William Forbes
William Forbes
21,469 Points
Posted by William Forbes
William Forbes
21,469 Points

Initialization

Has anyone done this challenge who could give me some advice as to what I am doing wrong. I know there is something I am doing wrong I just can't quite figure it out.

Thank you!

structs.swift 
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) {
        self.red = 86.0
        self.green = 191.0
        self.blue = 131.0
        self.alpha = 1.0
        self.description = "red: \(red), green \(green), blue \(blue), alpha \(alpha)"

    }



    // Add your code below
}

2 Answers

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

Hi William,

  1. You are missing the colons ':' in your description.
  2. You should not hardcode the value in the init. ;)
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) {
        self.red = red
        self.green = green
        self.blue = blue
        self.alpha = alpha
        self.description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)" // add :

    }
}

// Test in Playground
let testObject = RGBColor(red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0)
testObject.description

let testString = "red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0" // from code challenge
if testObject.description == testString {
    print("success") // If you get success you know it works.  That's how I quickly found the mistake
}

I hope that helps,

Mike

PS: Thanks to the awesome resources on Team Treehouse, I launched my first app.

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William Forbes
William Forbes
21,469 Points
William Forbes
William Forbes
21,469 Points

Thank for the info! Any way you can tell me why I did not have to initialize the description in line

init(red: Double, green: Double, blue: Double, alpha: Double) ^ | shouldn't I have to put the description initialization here?