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iOS Object-Oriented Swift Complex Data Structures Custom Initializers

Posted by Harry Treble
Harry Treble
1,977 Points

Not 100% understanding these initializers

Hi there,

really struggling to get this task. any help would be greatly appreciated.

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

  let description: String

  // Add your code below

    init() {
        self.red = 1.1
        self.green = 2.3
        self.blue = 1.2
        self.alpha = 3.0
        self.description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)"
    }
}

2 Answers

Dhanish Gajjar
Dhanish Gajjar
20,185 Points
Dhanish Gajjar
Dhanish Gajjar
20,185 Points

I would suggest revisiting the videos again and listening very closely :)

Hope the code below helps in understanding.

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)"
    }
}

let newColor = RGBColor(red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0)
newColor.description
Kanish Chhabra
Kanish Chhabra
2,151 Points
Kanish Chhabra
Kanish Chhabra
2,151 Points

You don't need to initialize 'description' in the initializer method because it's value is definite. Initializer is used only for those variables and constants whose value is determined while creating and instance which isn't the case with 'description' Assign the value to 'description' out of the init method and you're good to go! Hope it helps

Regards Kanish