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iOS Object-Oriented Swift Complex Data Structures Custom Initializers

Posted by Justus Aberson
Justus Aberson
1,035 Points

Help me!

Hey guys, I've done the first part of the question I believe but I dont know what to do next, can anyone explain it to me?

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, alpa: Double) -> Double {
self.red = 86.0
self.green = 191.0
self.blue = 131.0
self.alpha = 1.0
}



}

1 Answer

David Papandrew
David Papandrew
8,386 Points
David Papandrew
David Papandrew
8,386 Points

Hi Justus,

There are a few issues with your code.

1) No need to include the "-> Double" in the init signature

2) Pass the parameter values to the instance properties (the instance properties are self.red, etc., the init params are the values in the parens that the user will pass as arguments when creating the object). Right now you are hard coding the values.

3) Don't forget to set value for the description string with string interpolation

(lastly, alpha is misspelled in the init params -- little things like that might also cause problems)

Here is the corrected code:

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)"
   }
}

Now if you need to create object and then see the description string you can do this:

let myRGBColor = RGBColor(red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0)
print(myRGBColor.description)

Hope that helps.

Justus Aberson
Justus Aberson
1,035 Points

Thanks David!