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iOS Object-Oriented Swift Complex Data Structures Custom Initializers

Posted by Mackenzie Milroy
Mackenzie Milroy
3,162 Points

I am still stuck on this initalizer method can someone please walk me through this and explain each step

Its asking me to use sting interpolation and i was given the help: The problem is that you hardcode the values although in this task you should assing values using the initializer. I probably should say that you do it on an instance. It looks like this (lets assume this struct has 2 parameters, first of type Double and the second one of type Bool). But I tried to fix and It still wasn't passing. Also it doesn't pass the challenge if I change the constants to variables.

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)
  self.red = red
  self.green = green
  self.blue = blue
  self.alpha = alpha
  description = "\(red: 86.0) \(green: 191.0) \(blue:131.0) \(alpha: 1.0)"
  return(description)

}

2 Answers

lvwdhydynw
lvwdhydynw
6,443 Points

Hi Mackenzie!

First: the code challenge doesn't say you have to return the description, so don't do it

Second: apart from the fact you still hard-code it, this won't work.

  • get rid of those numbers there (that's where you are hard-coding)
  • the description should look like this: "red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0", however, your will look like this: "86.0 191.0 131.0 1.0". Add the names of colours and "," in the description
  • once you are done, try to create an instance of this struct and give it these numbers as parameters. If it look like what it should like, you've done it! :)
Andrea Miotto
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Andrea Miotto
iOS Development Techdegree Graduate 23,357 Points
Andrea Miotto
.a{fill-rule:evenodd;}techdegree seal-36
Andrea Miotto
iOS Development Techdegree Graduate 23,357 Points

You are doing wrong some things, this is the correct way:

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)"
}

You were missing one brackets, you were doing wrong the string interpolation in the description property, and you shouldn't return any value.