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iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

Posted by sreeputturi
sreeputturi
1,355 Points

stuck in coding challenge of Initializers and self.. help please!

The clue says custom init and I am trying to do that, but does not seem to go far.. can I get a few more clues as to what I am doing wrong?

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)
    { 
      red = 86.0
      green = 191.0
      blue = 131.0
      alpha = 1.0
      self.description = "red:" + "\(red)" + ",green:" + "\(green)" + ",blue:" + "\(blue)" + ",alpha" + "\(alpha)"
     }
}

1 Answer

Steven Deutsch
Steven Deutsch
21,046 Points
Steven Deutsch
Steven Deutsch
21,046 Points

Hey sreeputturi,

You're going to initialize your RGBColor struct with the values that you pass into the initializer method. So, you set up the parameters of the init() method properly, now you just need to assign those values to the stored properties of your struct. You can do this by using self to refer to the property of the struct that you want to assign a value to.

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) {

      /* we use self to refer to the property of the struct.
     self is used to differentiate between the parameter name and the property name.
     if we did red = red, Swift wouldn't know which red we're referring to */

      self.red = red
      self.green = green
      self.blue = blue
      self.alpha = alpha

     /* I updated your description to be a single string instead of concatenating
     as this is easier to get the spacing correct */

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

Hope this helps! Good Luck!

sreeputturi
sreeputturi
1,355 Points

It does. thanks much. The data that was in the challenge mis-lead me into thinking I could initialize within the struct.. dumb move.. Thanks Steven!