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iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

Posted by Nikhil Gawade
Nikhil Gawade
1,103 Points

I am still not able to understand the function of initializers completely. Please help

Hi,

Can you help me figure out the problem with the code I have written? If I initialize description, I get an error saying dont do a memberwise initializer like SWIFT. If i dont initialize description I get error saying description not initialized.

Please help

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) {
    self.red = red
    self.green = green
    self.blue = blue
    self.alpha = alpha
    //self.description = description
    }


    func getDesc() -> String {
      description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)"
      return description
    }

    // Add your code below

}

let abc = RGBColor(red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0)
let def = abc.getDesc()
print(def)

1 Answer

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

You are close. It's just that you are trying to initialize description in the function, rather than in the initializer:

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    
      description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)"  //here, as part of the initializer
    }

}