SwiftUI Color + Hex Extensions

ColorExtensions.swift

import SwiftUI

extension Color {
    var hexString: String {
        let cg = UIColor(self).cgColor
        let components = cg.components
        let r: CGFloat = components?[0] ?? 0.0
        let g: CGFloat = components?[1] ?? 0.0
        let b: CGFloat = components?[2] ?? 0.0

        return String.init(format: "#%02lX%02lX%02lX", lroundf(Float(r * 255)), lroundf(Float(g * 255)), lroundf(Float(b * 255)))
    }

    init?(hex: String) {
        let r, g, b, a: CGFloat

        guard hex.hasPrefix("#") else { 
            return nil
        }
        let start = hex.index(hex.startIndex, offsetBy: 1)
        let hexColor = String(hex[start...])

        guard hexColor.count == 6 else { 
            return nil
        }
        let scanner = Scanner(string: hexColor)
        var hexNumber: UInt64 = 0

        if scanner.scanHexInt64(&hexNumber) {
            r = CGFloat((hexNumber & 0xff000000) >> 24) / 255
            g = CGFloat((hexNumber & 0x00ff0000) >> 16) / 255
            b = CGFloat((hexNumber & 0x0000ff00) >> 8) / 255
            a = CGFloat(hexNumber & 0x000000ff) / 255

            let uiColor = UIColor(red: r, green: g, blue: b, alpha: a)
            self.init(uiColor: uiColor)
        } else {
            return nil
        }
    }

}