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iOS Object-Oriented Swift Complex Data Structures Custom Initializers

Monzer Selim
PLUS
Monzer Selim
Courses Plus Student 3,849 Points
Posted by Monzer Selim
Monzer Selim
Courses Plus Student 3,849 Points

Using initialisers methods

can you help me with this one plz check attached code

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) {

        let red = 86.0
        let green = 191.0
        let blue = 131.0
        let alpha = 1.0
        let description = "red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0"
        self.red = red
        self.green = green
        self.blue = blue
        self.alpha = alpha
        self.description = description


}
}
U Belfast
U Belfast
6,439 Points

Hi,

Try this one:

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: \(self.red), green: \(self.green), blue: \(self.blue), alpha: \(self.alpha)"
    }        
}

2 Answers

U Belfast
U Belfast
6,439 Points
U Belfast
U Belfast
6,439 Points

Hi,

try this one

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: \(self.red), green: \(self.green), blue: \(self.blue), alpha: \(self.alpha)"
    }        
}
Matthew Connolly
seal-mask
.a{fill-rule:evenodd;}techdegree
Matthew Connolly
iOS Development Techdegree Student 11,595 Points
Matthew Connolly
.a{fill-rule:evenodd;}techdegree
Matthew Connolly
iOS Development Techdegree Student 11,595 Points

Hey Monzer,

Documentation for initialization: Swift 3.0 Initialization. I think a relevant topic is Parameter Names and Argument Labels.

I see a couple things you can fix:

  1. You don't need the description: String argument in your init method. That String can be created independent of the initialization step.
  2. Remove the values you assign in your init method (first four lines of the method). Those values will be provided when a RGBColor instance is created. Same goes for hard-coding your description.

The next four lines are perfect. This is the foundation of your init method. And from those values you can create a description using string interpolation. 

self.red = red
self.green = green
self.blue = blue
self.alpha = alpha
self.description = /* use string interpolation */