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iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

boris said
boris said
3,607 Points

Challenge saying that I need to make a custom initializer but I already have.

Also, there are no errors in X-Code. I appreciate your help greatly and thank you in advanced.

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, 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)"

    }

}

3 Answers

Hi!

Your code is syntaxlly correct! but its not correct for the challenge. You dont need to init the description so your code should look like this

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
        description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)"

    }

}

The reason you don't init the description is because it says to only init the first 4 properties. (I hope I have made sense, if i haven't please tell me and il try and explain it in a different way!)

boris said
boris said
3,607 Points

I understand, thank you for helping me.

Hi Boris,

In your code, you are currently setting the self values to constant Doubles. Those numbers are given in the challenge as an example. The struct should be able to return any set of Double values, not just 86.0, 191.0 etc.

To make the code flexible, you need to assign the stored color properties (self.red, self. green etc) to the color values passed in by the initializer method (red, green etc).

The proper code looks like this.

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)"
} 
}
Filip Diarra
Filip Diarra
6,647 Points

Quick question: If we don't initialize the description, how can this work? I thought that if you initialize manually, you must initialize all of the constants.

Does that make sense? Thanks!