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iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

Posted by Keith James
Keith James
Courses Plus Student 8,159 Points

What am I doing wrong???

I swear this is a custom initializer...is it not?? Please help.

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

1 Answer

Martin Wildfeuer
PLUS
Martin Wildfeuer
Courses Plus Student 11,071 Points
Martin Wildfeuer
Martin Wildfeuer
Courses Plus Student 11,071 Points

Almost there, just make sure to not add the description parameter to your init method. With the description parameter, you are recreating the memberwise initializer, but as we want to set description manually in our init method, it's not necessary to pass it to the init method. Therefore, you can omit the description parameter and write an initializer that only expects the parameters for creating the color.

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) {
        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)"
    }
}

Hope that helps :)

P.S.

Btw., I have to check the docs again if there's a definition, but in my opinion you wrote a custom init method with your approach as well, as you can do additional customization even though it expects the same parameters as the memberwise initializer.