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iOS Object-Oriented Swift Complex Data Structures Custom Initializers

NATHAN TRAN
NATHAN TRAN
2,367 Points
Posted by NATHAN TRAN
NATHAN TRAN
2,367 Points

String Interpolation

I know what I need to do but I can not figure out the set up for the string interpolation

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: 86.0, green: 191.0, blue: 131.0, alpha: 1.0) {

     return "86.0 is \(red), 191.0 is \(green), 131.0 is \(blue), 1.0 is \(alpha)"

}
}

2 Answers

Jeff McDivitt
Jeff McDivitt
23,970 Points
Jeff McDivitt
Jeff McDivitt
23,970 Points

You are missing a couple components

  1. You never initialized the variables
  2. You do not need the word "is" anywhere in the return, but you need to include the labels
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 = red
        self.green = green
        self.blue = blue
        self.alpha = alpha
        self.description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)"
    }
}

let myColor = RGBColor(red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0)
NATHAN TRAN
NATHAN TRAN
2,367 Points
NATHAN TRAN
NATHAN TRAN
2,367 Points

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)" }

Why do we need "self.red....etc." in here?