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iOS Enumerations and Optionals in Swift Introduction to Enumerations Methods on Enumerations

Micheal Corr
Micheal Corr
2,018 Points

colorLiteralRed not working - Swift 5 Xcode 11

Hi, Here is my code as instructed by the video:

enum ColorComponent {
    case rgb(Float, Float, Float, Float)
    case hsb(CGFloat, CGFloat, CGFloat, CGFloat)

    func color() -> UIColor {
        switch self {
        case .rgb(let red, let green, let blue, let alpha): return UIColor(colorLiteralRed: red/255.0, green/255.0, blue/255.0, alpha/255.0)
        case .hsb(let hue, let saturation, let brightness, let alpha): return UIColor(hue: hue/360.0, saturation: saturation/100.0, brightness: brightness/100.0, alpha: alpha)
        }
    }
}
ColorComponent.rgb(61.0, 120.0, 198.0, 1.0).color()

However, at colorLiteralRed it flags an error: "incorrect argument label"

I tried to take a look at the other initialisers available to me under UIColor and none had arguments that matched anything similar to UIColor(red: Float green: Float blue: Float alpha: Float)

The only thing i could find similar was UIColor(red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat).

Will this achieve the same thing? My code now looks like this:

enum ColorComponent {
    case rgb(CGFloat, CGFloat, CGFloat, CGFloat)
    case hsb(CGFloat, CGFloat, CGFloat, CGFloat)

    func color() -> UIColor {
        switch self {
        case .rgb(let red, let green, let blue, let alpha): return UIColor(red: red/255.0, green: green/255.0, blue: blue/255.0, alpha: alpha/255.0)
        case .hsb(let hue, let saturation, let brightness, let alpha): return UIColor(hue: hue/360.0, saturation: saturation/100.0, brightness: brightness/100.0, alpha: alpha)
        }
    }
} 
ColorComponent.rgb(61.0, 120.0, 198.0, 1.0).color()

Is this an acceptable workaround or am I on the complete wrong track? Im not sure if this is a compatibility issue with the versions or if I have just done something dumb somewhere to trigger the error.

Any help appreciated!

2 Answers

Hi, if you want to achieve the same thing with a newer version of xCode, just do the following:

enum ColorComponent{
    case rgb(red:CGFloat,green:CGFloat,blue:CGFloat,alpha:CGFloat)
    case hue(hue:CGFloat,saturation:CGFloat,brightness:CGFloat,alpha:CGFloat)
    func getColor()->UIColor{
        switch self {
            case .rgb(let red,let green,let blue,let alpha):return UIColor.init(displayP3Red: red/255.0, green: green/255.0, blue: blue/255.0, alpha: alpha)
            case .hue(let hue,let saturation,let brightness,let alpha):return UIColor.init(hue: hue/360.0, saturation: saturation/100.0, brightness: brightness/100.0, alpha: alpha)
        }
    }
}

If that helped you, please mark as best answer to indicate other students your issue is resolved!

Micheal Corr
Micheal Corr
2,018 Points

Hi Victor, Thanks for the quick reply - this seems to work for me!

Can you provide any further explanation on the difference between the (displayP3Red, green, blue, alpha) initialiser and the one that just takes red, green, blue, alpha in my example?

Just to say that your code should probably be working also!