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iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

Joshua W
Joshua W
4,345 Points
Posted by Joshua W
Joshua W
4,345 Points

cannot get pass the quiz

please see my code, thanks struct RGBColor { let red: Double let green: Double let blue: Double let alpha: Double

let description: String

// Add your code below

init()
{
    red = 86.0
    green = 191.0
    blue = 131.0
    alpha = 1.0
    description = "red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0"
}

}

1 Answer

Nathan Tallack
Nathan Tallack
22,159 Points
Nathan Tallack
Nathan Tallack
22,159 Points

Ok, let's take a look at how the struct is setup and how the code comes together.

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) {
        self.red = red
        self.green = green
        self.blue = blue
        self.alpha = alpha

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

Key points are:

1: We declare our properties (red, green, blue, alpha, description) as part of the Struct.
2: We make our init method that takes in the passed arguments from the object creation.
3: See we are not passing description in because that is a computed property.
4: That computed property is why we need to make our own init method.

So then a user would create a RGBColor object with a command like this.

let bgColor = RGBColor(red: 86.0, green: 77.0, blue: 55.0, alpha: 128)

That computed property description would then look like this.

"red: 86.0, green: 77.0, blue: 55.0, alpha: 128.0"

I hope this helps clear it up for you. :)

Trent Christofferson
Trent Christofferson
18,846 Points

OMG THANK YOU SO MUCH!!! y dont we need to put description: String in parentheses with red: Double and all the other ones