Hex extension for Color

Color+Hex.swift

//
//  Color+Hex.swift
//

import SwiftUI

extension Color {
    // MARK: - Private Helpers
    /// Parses a sanitized 6-digit hex string (RRGGBB) into normalized RGB components.
    /// - Parameter hexSanitized: Hex string without leading '#', must be exactly 6 characters.
    /// - Returns: Tuple of (red, green, blue) in 0.0...1.0 if parsing succeeds; otherwise nil.
    private static func rgbComponents(fromSixDigitHex hexSanitized: String) -> (
        red: Double, green: Double, blue: Double
    )? {
        guard hexSanitized.count == 6 else { return nil }

        var rgb: UInt64 = 0
        guard Scanner(string: hexSanitized).scanHexInt64(&rgb) else { return nil }

        let red = Double((rgb >> 16) & 0xFF) / 255.0
        let green = Double((rgb >> 8) & 0xFF) / 255.0
        let blue = Double(rgb & 0xFF) / 255.0
        return (red, green, blue)
    }

    public init?(hex: String) {
        var hexSanitized = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()

        // Remove hash if it exists
        if hexSanitized.hasPrefix("#") {
            hexSanitized.remove(at: hexSanitized.startIndex)
        }

        // Support 6-digit (RRGGBB) and 8-digit (RRGGBBAA) hex strings
        if hexSanitized.count == 8 {
            let alphaHex = String(hexSanitized.suffix(2))
            let rgbHex = String(hexSanitized.prefix(6))

            var alphaInt: UInt64 = 0
            guard Scanner(string: alphaHex).scanHexInt64(&alphaInt) else { return nil }
            let alpha = Double(alphaInt) / 255.0

            guard let comps = Color.rgbComponents(fromSixDigitHex: rgbHex) else { return nil }
            self.init(.sRGB, red: comps.red, green: comps.green, blue: comps.blue, opacity: alpha)
            return
        } else if hexSanitized.count == 6 {
            guard let comps = Color.rgbComponents(fromSixDigitHex: hexSanitized) else { return nil }
            self.init(red: comps.red, green: comps.green, blue: comps.blue)
            return
        } else {
            // Invalid length
            return nil
        }
    }
}