Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

Posted by Ben Forrester
Ben Forrester
Courses Plus Student 5,357 Points

Need help

I am stumped with this challenge and need help. Can someone please contact me to discuss? thanks

structs.swift 
struct RGBColor {
    let red: Double
    let green: Double
    let blue: Double
    let alpha: Double

    let description: String

    // Add your code below
}

1 Answer

jcorum
jcorum
71,816 Points
jcorum
jcorum
71,816 Points 
    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)"
    }

self.red = red means my red (i.e., the stored property) should be assigned the red value being passed to the initializer.

E.g., if you call the initializer like this:

let color = RGBColor(24, 36, 255, 0)

then the struct's stored property red will have the value 24.

description doesn't need self because it's a calculated property. It's String value is made up from the other, passed in, values, and uses String interpolation to combine them all into a String.

Happy coding!