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iOS Object-Oriented Swift 2.0 Complex Data Structures Initializers and Self

Posted by Jacob Carroll
Jacob Carroll
5,957 Points

Object-Oriented Swift Code Challenge: Custom Intializers *Problem*

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)")

} }

RGBColor.init(red: 86.0, green: 191.0, blue: 131.0, aplha: 1.0)

What is wrong with this code? ( It tells me: Bummer! Don't use the memberwise initializer Swift creates. Add your own custom initializer as specified in the directions. )

I don't know to pass the test. Help?

Alexander Phlippen
Alexander Phlippen
947 Points

Please see my working code in a comment below. Best, Oliver

3 Answers

Alexander Phlippen
Alexander Phlippen
947 Points

Okay, so I've got this stage cleared. I don't know why, but the issue did not seem to be the initializer, but that it was not called afterwards.

The following code worked for me:

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

let myColor = RGBColor(red: 86.0,green: 191.0, blue: 131.0, alpha: 1.0)
myColor.description
Eric Lakatos
Eric Lakatos
2,338 Points
Eric Lakatos
Eric Lakatos
2,338 Points

since description returns a string, try removing the individual interpolated values and just wrap them all up into a single string

self.description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)";
Alexander Phlippen
Alexander Phlippen
947 Points

UPDATE: I've posted a working code snipped in the comment below.

Does not to solve the issue in Swift 3 for me.

My struct looks like this currently: 

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, description: String) {
      self.red = red
      self.green = green
      self.blue = blue
      self.alpha = alpha
      self.description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)";
    }
}
Trent Christofferson
Trent Christofferson
18,846 Points
Trent Christofferson
Trent Christofferson
18,846 Points

it is because you are using strings in the values and the type is set to Double. try:

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

Alexander Phlippen
Alexander Phlippen
947 Points

UPDATE: I've posted a working code snipped in the comment below.

Also tried this version, wich sadly raises the same error

Bummer! Don't use the memberwise initializer Swift creates. Add your own custom initializer as specified in the directions

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, description: String) {
      self.red = red
      self.green = green
      self.blue = blue
      self.alpha = alpha
      self.description = (red: red, green: green, blue: blue, alpha: alpha)
    }
}