Uicolor

UIColor

Extension

You could define your colors extension in a separate folder and class file. That would better define your codebase in a cleaner approach. So it could be used anywhere in the project where it takes UIColor or Color class object of any sort.

// Extension Define
import UIKit
extension UIColor {
    static let kautilyaPrimaryColor = #colorLiteral(red: 0.6220935889, green: 0.9803921569, blue: 0.3810976606, alpha: 1)
}

// Utilize
 view.backgroundColor = .kautilyaPrimaryColor

You would get clean code and also direct shorthand autocompletion. Rather than writing verbose code like this

// Define
struct HSColors {
    // Colors
    static let sensehackDarkGrey = UIColor(red: 69/255, green: 69/255, blue: 69/255, alpha: 1)
}

// Utilize
view.backgroundColor = HSColors.sensehackDarkGrey;
// OR
view.backgroundColor = UIColor(red: 0.6220935889, green: 0.9803921569, blue: 0.3810976606, alpha: 1);

Color Literal

static let kautilyaPrimaryColor = #colorLiteral(red: 0.6220935889, green: 0.9803921569, blue: 0.3810976606, alpha: 1)
}

You can use #colorLiteral(r:g:b:a:); to hide the values of the color itself. Xcode just interprets and abstracts these values with a colored square. Double tap to edit it using the color dialog view or you can see its actual values in git.

SwiftUI Migration

UIColor -> Color

Use Color for SwiftUI unless you want to explicitly convert UIColor to Color in its initializer or extension.

UIColor.primary
// Newer
Color.primary

foregroundColor -> foregroundStyle

Deprecated property code

// Old
.foregroundColor(.primary)
// New
.foregroundStyle(.primary)

inverse color extension

Code snippet from SO

func inverseColor() -> UIColor {
    var alpha: CGFloat = 1.0
    
    var red: CGFloat = 0.0, green: CGFloat = 0.0, blue: CGFloat = 0.0
    if self.getRed(&red, green: &green, blue: &blue, alpha: &alpha) {
        return UIColor(red: 1.0 - red, green: 1.0 - green, blue: 1.0 - blue, alpha: alpha)
    }
    
    var hue: CGFloat = 0.0, saturation: CGFloat = 0.0, brightness: CGFloat = 0.0
    if self.getHue(&hue, saturation: &saturation, brightness: &brightness, alpha: &alpha) {
        return UIColor(hue: 1.0 - hue, saturation: 1.0 - saturation, brightness: 1.0 - brightness, alpha: alpha)
    }
    
    var white: CGFloat = 0.0
    if self.getWhite(&white, alpha: &alpha) {
        return UIColor(white: 1.0 - white, alpha: alpha)
    }
    
    return self
}

References

Resolved Color -> with system trait of appearance set.
Apple dev | ui color resolver