Dynamic Color Theming with UIColor Extension

The provided Swift code is an extension on the UIColor class in Swift, implementing dynamic color theming based on the user interface style (light or dark mode). The code is designed to work with color assets, such as those defined in an XCAssets file.

    /// Basically returns a Color Set like we see in XCAssets
    private static func colorSet(light: UIColor, dark: UIColor? = nil) -> UIColor {
        UIColor { traitCollection -> UIColor in
            switch traitCollection.userInterfaceStyle {
            case .dark:
                return dark?.resolveToLight() ?? light.resolveToLight()
            case .light, .unspecified:
                fallthrough
            @unknown default:
                return light.resolveToLight()
            }
        }
    }

    /// Returns the Light Appearance UIColor of the given SwiftGen color asset
    private static func lightColorFrom(assetColor: AssetColorTypeAlias) -> UIColor {
        let color: UIColor = assetColor
        return color.resolveToLight()
    }

    /// Returns the current UIColor's Light Appearance
    private func resolveToLight() -> UIColor {
        resolvedColor(with: UITraitCollection(userInterfaceStyle: .light))
    }

Functions:

colorSet(light:dark:) function:

• This function takes two UIColor parameters, light and dark (optional).
• It returns a dynamic UIColor based on the current user interface style.
• Inside the closure, it uses a traitCollection to determine the current user interface style.
• If the style is dark, it resolves to the dark color (or falls back to resolving light to a light appearance if dark is not provided).
• If the style is light or unspecified, it resolves to the light color.

lightColorFrom(assetColor:) function:

• This function takes an AssetColorTypeAlias (presumably a color asset generated by SwiftGen) and converts it to a UIColor.
• It then calls the resolveToLight() method on the obtained color.

resolveToLight() method:

• An instance method for UIColor that resolves the color to its light appearance.
• It utilizes resolvedColor(with:) method with a UITraitCollection set to light mode.

Usage:

• Developers can use colorSet(light:dark:) when defining dynamic colors, allowing the system to automatically choose the appropriate color based on the user interface style.
• The lightColorFrom(assetColor:) function is provided for converting color assets to their light appearances.
• The resolveToLight() method can be used on any UIColor instance to get its light appearance.

This code promotes code reusability and enhances the adaptability of the app’s color scheme to different system appearances. It is particularly useful when working with dynamic theming and ensuring a consistent visual experience across different UI styles.