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iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

Posted by eddyfrankenberger
eddyfrankenberger
9,264 Points

Unsure why this is not creating a custom initializer

I've been working on this for a while and just can't figure it out. The exercise is to create a customer initializer, but I keep failing and getting a message that I'm not using a custom initializer. Can someone help me figure out what I'm doing wrong?

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)"
    }
}

2 Answers

Jhoan Arango
Jhoan Arango
14,575 Points
Jhoan Arango
Jhoan Arango
14,575 Points

Hello:

Since you are hard coding the values for the description property, then you don't have to add "description" to your parameters..

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

also, the "self.description" is optional at this point since the compiler knows what you are referring to. You only use "self", when there is a naming conflict, and the compiler does not know what you are referring to.

For example 

struct AnyStruct{

var name: String

    init(name: String) {
        self.name = name 
     }
}

In this example, "self.name" refers to the store property var name: String, and "name" is the parameter, init(name: String).

Hope this helps you a bit. Good luck

eddyfrankenberger
eddyfrankenberger
9,264 Points
eddyfrankenberger
eddyfrankenberger
9,264 Points

Thanks for that! Makes sense now