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iOS Object-Oriented Swift Complex Data Structures Custom Initializers

Aananya Vyas
Aananya Vyas
20,157 Points
Posted by Aananya Vyas
Aananya Vyas
20,157 Points

Don't know what to do?!

??????

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 : Int , green: Int , blue : Int , alpha: Int , description: String){
  self.red = red
  self.green = green
  self.blue = blue
  self.alpha = alpha
  self.description = "red: \(red) ,green: \(green) ,blue: \(blue) , alpha:\(alpha)"
}
func getcolor (red : Double , green: Double , blue: Double , alpha: Double){
return "red: \(red) ,green: \(green) ,blue: \(blue) , alpha:\(alpha)"
}

}
let acolor = getcolor (red : 86.0 , green:191.0, blue:131.0, alpha: 1.0)

1 Answer

Alexander La Bianca
Alexander La Bianca
15,959 Points

Hi, You do not need to include the description property in the initializer function. Here is how I would create the RGBColor struct. Notice that the init takes Double values and not Int

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

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

}

By passing in all the Double values you can create a string and assign it to the description property. That way you automatically create a value for the description property every time you initialize a new RGBColor object.

You can access the description property the following way now: 

let someColor = RGB(red: 86.0, green:131.0, blue: 91.0, alpha:0.8)
let someDescription = someColor.description

//someDescription will be "red: 86.0, green: 131.0, blue: 91.0, alpha: 0.8"