UIColor+Extensions #ios #swift #UIColor

UIColor+Extension.swift

extension UIColor {
    public convenience init?(hex: String) {
        let r: CGFloat
        let g: CGFloat
        let b: CGFloat
        let a: CGFloat

        let start = hex.index(hex.startIndex, offsetBy: hex.hasPrefix("#") ? 1 : 0)
        var hexColor = String(hex[start...])
        if hexColor.count == 6 { hexColor += "FF" }

        if hexColor.count == 8 {
            let scanner = Scanner(string: hexColor)
            var hexNumber: UInt64 = 0

            if scanner.scanHexInt64(&hexNumber) {
                r = CGFloat((hexNumber & 0xff00_0000) >> 24) / 255
                g = CGFloat((hexNumber & 0x00ff_0000) >> 16) / 255
                b = CGFloat((hexNumber & 0x0000_ff00) >> 8) / 255
                a = CGFloat(hexNumber & 0x0000_00ff) / 255

                self.init(red: r, green: g, blue: b, alpha: a)
                return
            }
        }

        return nil
    }
}