Color Hexadecimal

extension UIColor { public convenience init?(hexString: String) { let r, g, b, a: CGFloat if hexString.hasPrefix("#") == true { let start = hexString.index(hexString.startIndex, offsetBy: 1) let hexColor = hexString.substring(from: start) if hexColor.characters.count == 8 { 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 self.init(red: r, green: g, blue: b, alpha: a) return } } } return nil } } //Usage let gold = UIColor(hexString: "#ffe700ff")