Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

Ben Masel
Ben Masel
2,004 Points
Posted by Ben Masel
Ben Masel
2,004 Points

VERY CONFUSED!

I REALLY need help with this CC. I also need help with:

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

    let description: String

    // Add your code below

}

2 Answers

Christian Bjørtomt
Christian Bjørtomt
3,967 Points
Christian Bjørtomt
Christian Bjørtomt
3,967 Points

Hi! This should help. I recommend posting the code you have written yourself next time, so I can explain what you are doing wrong :) Happy coding!

          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)"
}
Jason Cornwall
Jason Cornwall
9,645 Points
Jason Cornwall
Jason Cornwall
9,645 Points

When you're creating a struct in swift, the language creates default initializer for you for every stored property that you have. But you can also write your own initializer, 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)"
    }
}

What this is doing is allowing you to input a value for each of the struct's stored properties each time you create and instance of the struct. I hope this helps a bit.