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iOS Object-Oriented Swift Complex Data Structures Custom Initializers

Posted by Benjamin Laskaris
Benjamin Laskaris
1,177 Points

Can anyone point out what is wrong with this code?

The code that I have written matches with how the swift books and the videos have described custom initializers. I can't see any errors, but the practice problem keeps telling me to not use the memberwise initializer.

Let me know if I am missing something please.

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, description: String) {
  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

Jason Anders
MOD
Jason Anders
Treehouse Moderator 145,860 Points
Jason Anders
Jason Anders
Treehouse Moderator 145,860 Points

Hey Benjamin,

You're on the right track, and the error is a bit vague, but what it is talking about is the description. You don't put that into the init parameters. Instead, you use the one by default in the Struct. So, you just need to remove the parameter in the init and the rest is all good.

init(red: Double, green: Double, blue: Double, alpha: Double)

Keep Coding! :) :dizzy:

Benjamin Laskaris
Benjamin Laskaris
1,177 Points

Ah, I see now. Thank you!

jenko
jenko
8,562 Points

This was very helpful, thanks!

tipi99
tipi99
3,019 Points
tipi99
tipi99
3,019 Points

Still code can not be compiled in workspace...(but it compiles in XCode!) What is wrong?

struct RGBColor {
  let red: Double
  let green: Double
  let blue: Double
  let alpha: Double

  let description: String

  // Add your code below
  init () {
    self.red = 86.0
    self.green = 191.0
    self.blue = 131.0
    self.alpha = 1.0
    self.description = "red: \(self.red), green: \(self.green), blue: \(self.blue), alpha: \(self.alpha)"
  } 
}
Gavin Hobbs
Gavin Hobbs
5,205 Points
Gavin Hobbs
Gavin Hobbs
5,205 Points

@JasonAnders said to just remove the description parameter in the init function. So it should look like this...

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)"
  }
}

Notice that there are still the red, green, blue, and alpha parameters in the initializer function. Only the description: String was removed.