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

Posted by Prem Agrawal
Prem Agrawal
117 Points

error: Enumerations.playground:48:20: error: 'init(colorLiteralRed:green:blue:alpha:)' is unavailable: This initializer

enum ColorComponent{ case rgb(Float,Float,Float,Float); func color()->UIColor{ switch self{ case .rgb(let red, let green, let blue, let alpha): return UIColor(colorLiteralRed:red/255.0,green:green/255.0,blue:blue/255.0,alpha: alpha) } } } ColorComponent.rgb(61,120,128,1.0).color() Whats wrong with this Code?

10 Answers

Jonatan Witoszek
Jonatan Witoszek
15,384 Points
Jonatan Witoszek
Jonatan Witoszek
15,384 Points

It seems to me that colorLiteralRed had been depreaced in the newer versions of Swift and is used to store the new color literals.

You can use different UIColor methods instead:

UIColor(displayP3Red:, green:, blue:, alpha: )

or

UIColor(red: , green: , blue: , alpha: )

Just remember to also change the type from Float to CGFloat just like in the hsb example.

Also good to know there is now a simpler, more visual way to store color values in Swift as i mentioned before. You can read more about it here: https://medium.com/@gurdeep060289/color-image-new-literals-in-the-cocoa-town-7ef4f2710194

Reference: https://stackoverflow.com/questions/45361704/initcolorliteralred-green-blue-alpha-deprecated-in-swift-4, https://stackoverflow.com/questions/46344226/error-uicolorcolorliteralred

Alexei Parphyonov
Alexei Parphyonov
34,128 Points
Alexei Parphyonov
Alexei Parphyonov
34,128 Points

I have worked it out this way. It works, and the result of RGBA is the same as in the video.

enum ColorComponent {
    // rgb - red, green, blue
    // hsb - hue, saturation, brightness
    case rgb(red: Float, green: Float, blue: Float, alpha: Float)
    case hsb(hue: CGFloat, saturation: CGFloat, brightness: CGFloat, alpha: CGFloat)
    // In Swift each enum member can store associated values of other types along with this member value

    func color() -> UIColor {
        switch self {
        case .rgb(let red, let green , let blue, let alpha):
            return UIColor(red: CGFloat(red/255), green: CGFloat(green/255.0), blue: CGFloat(blue/255.0), alpha: CGFloat(alpha))
        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)
        }
    }
}

let rgbMember = ColorComponent.rgb(red: 61.0, green: 120.0, blue: 198.0, alpha: 1.0).color()
let hsbMember = ColorComponent.hsb(hue: 26.09, saturation: 68.05, brightness: 66.27, alpha: 1.0).color()
Gavin Hobbs
Gavin Hobbs
5,205 Points
Gavin Hobbs
Gavin Hobbs
5,205 Points

I checked out the link Jonatan Witoszek provided, the one with the medium article, and I found a way!

Here's my code!

import UIKit

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 #colorLiteral (red: red/255.0, green: green/255.0, blue: blue/255.0, alpha: alpha)
        case .hsb(let hue, let saturation, let brightness, let alpha):
            return UIColor(hue: hue/36.0, saturation: saturation/100.0, brightness: brightness/100.0, alpha: alpha)
        }
    }
}

ColorComponent.rgb(61.0, 120.0, 198.0, 1.0).color()

... And YES! It works!!!

This is what the Medium author, Gurdeep Singh, said...

extension UIColor {
     @nonobjc required public convenience init(colorLiteralRed              red: Float, green: Float, blue: Float, alpha: Float)
}
// USAGE : #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
Kirill Druzhynin
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Kirill Druzhynin
Python Web Development Techdegree Student 4,874 Points
Kirill Druzhynin
.a{fill-rule:evenodd;}techdegree
Kirill Druzhynin
Python Web Development Techdegree Student 4,874 Points

Swift 4 DevDocs knows nothing about literalColor. I think they dropped this thing. You should you displayP3 instead of colorLiteral and CGFloat instead of Float. Here is the code that works great for me:

enum ColorComponent {
    case rgb(red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat)
    case hsb(hue: CGFloat, saturation: CGFloat, brightness: CGFloat, alpha: CGFloat)

    func color() -> UIColor {
        switch self {
        case .rgb(let red, let blue, let green, let alpha):
            return UIColor(displayP3Red: red/255.0, green: green/255.0, blue: blue/255.0, alpha: alpha)
        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(red: 61.0, green: 120.0, blue: 198.0, alpha: 1.0).color()
ColorComponent.hsb(hue: 61.0, saturation: 120.0, brightness: 198.0, alpha: 1.0).color()
Linus Karlsson
Linus Karlsson
7,402 Points

Great comment, much obliged!

Raymond Choy
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Raymond Choy
iOS Development with Swift Techdegree Graduate 11,187 Points
Raymond Choy
.a{fill-rule:evenodd;}techdegree seal-36
Raymond Choy
iOS Development with Swift Techdegree Graduate 11,187 Points

Kirill Druzhynin! As of July 22, 2019 Swapping out Pasan's outdate wrong syntax "colorLiteralRed" and replacing it with your correct updated syntax "displayP3Red" and "CGFloat" instead of "Float" fixed all the error messages. Thank you!!!!!!!! This was driving me crazy. I thought they would have a ding sound when something they were teaching us changed in the latest version of Swift. smh

apbaca06
apbaca06
4,637 Points
apbaca06
apbaca06
4,637 Points

still having trouble with it.... can somebody help?

Gavin Hobbs
Gavin Hobbs
5,205 Points
Gavin Hobbs
Gavin Hobbs
5,205 Points

apbaca06 I'm stil having trouble too! Here's my code...

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))
        case .hsb(let hue, let saturation, let brightness, let alpha):
                return UIColor(hue: hue/36.0, saturation: saturation/100.0, brightness: brightness/100.0, alpha: alpha)
        }
    }
}

ColorComponent.rgb(61.0, 120.0, 198.0, 1.0).color()

I've also tried the displayP3 method too as Jonatan Witoszek mentioned and I still get the same error as I'm getting with the code above.

Here's my errors...

Playground execution failed:

error: EnumerationsOptional.playground:63:95: error: consecutive statements on a line must be separated by ';'
            return UIColor(red: red/255.0, green: green/255.0, blue: blue/255.0, alpha: alpha))
                                                                                              ^
                                                                                              ;

error: EnumerationsOptional.playground:63:95: error: expected expression
            return UIColor(red: red/255.0, green: green/255.0, blue: blue/255.0, alpha: alpha))
                                                                                              ^
Nico Schmidt
Nico Schmidt
12,781 Points
Nico Schmidt
Nico Schmidt
12,781 Points 
import UIKit

enum ColorComponent{
    case rgb(Float,Float,Float,Float) // <- Here was a semicolon too much
    func color()->UIColor{
        switch self{
        case .rgb(let red, let green, let blue, let alpha):
            return UIColor(colorLiteralRed:red/255.0,green:green/255.0,blue:blue/255.0,alpha: alpha)
        }
    }
}
ColorComponent.rgb(61,120,128,1.0).color()
Prem Agrawal
Prem Agrawal
117 Points

SemiColons are used to separate out different lines of code from each other although i copy pasted your code but the same error popped up i think its because of the UIColor(colorLiteralRed) as it may not exist in the newer version of xcode........and how do u make our codes background black here..???

Gavin Hobbs
Gavin Hobbs
5,205 Points
Gavin Hobbs
Gavin Hobbs
5,205 Points

Prem Agrawal, you can make your code black if you check out the Markdown Cheetsheet...

Markdown Cheatsheet Markdown is a short-hand syntax for easily converting text to HTML. Below are some popular examples of Markdown formatting. For more examples reference Markdown Basics for a more detailed overview.

Code Wrap your code with 3 backticks (```) on the line before and after. If you specify the language after the first set of backticks, that'll help us with syntax highlighting.

      ```html
      <p>This is code!</p>
      ```

Additionally to make things bold add two asterisks to the front and the end of what you want bold and just one asterisk for italics

Nico Schmidt
Nico Schmidt
12,781 Points
Nico Schmidt
Nico Schmidt
12,781 Points

It does work for me on the newest version. Did you import UIKit?

Prem Agrawal
Prem Agrawal
117 Points

Yes i have imported UIKit but still it does not work for me i am having Xcode version 9.0 beta 5

Prem Agrawal
Prem Agrawal
117 Points
Prem Agrawal
Prem Agrawal
117 Points

import UIKit

enum ColorComponent{ case rgb(CGFloat,CGFloat,CGFloat,CGFloat) // <- Here was a semicolon too much func color()->UIColor{ switch self{ case .rgb(let red, let green, let blue, let alpha): return UIColor(red: red,green: green,blue: blue,alpha: alpha) } } } ColorComponent.rgb(61,120,128,1.0).color()

Now this code does worked for me as i was expecting the problem was with colorLiteralRed which was nowhere present in Developers Documentation of my Xcode so i went there and checked for UIColor and now its working , If anyone had same problem this is the code you are looking for.

codyl
codyl
4,704 Points
codyl
codyl
4,704 Points

So in other words, this video has been wrong for about a year and a half, and they've not updated it.

Come on Pasan Premaratne I only get so much time to do these lessons. When stuff like this happens it takes me longer to trouble shoot to figure out why it's not working for me than I spend on the lessons.

josh kinney
josh kinney
1,576 Points
josh kinney
josh kinney
1,576 Points

Agree this needs to be addressed. I pay for these lessons and I sure hope they would keep them updated

bytepunch
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bytepunch
iOS Development with Swift Techdegree Student 5,114 Points
bytepunch
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bytepunch
iOS Development with Swift Techdegree Student 5,114 Points

XCode 10.3 (Swift 5) compiler told me this:

return UIColor(_colorLiteralRed: red/255.0, green: green/255.0, blue: blue/255.0, alpha: alpha)

Needs just an underscore.