UIColor+Hex.swift

import UIKit

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

        if hex.hasPrefix("#") {
            let start = hex.index(hex.startIndex, offsetBy: 1)
            let hexColor = String(hex[start...])

            if hexColor.count == 6 {
                let scanner = Scanner(string: hexColor)
                var hexNumber: UInt64 = 0

                if scanner.scanHexInt64(&hexNumber) {
                    r = CGFloat((hexNumber & 0xff0000) >> 16) / 255
                    g = CGFloat((hexNumber & 0x00ff00) >> 8) / 255
                    b = CGFloat((hexNumber & 0x0000ff)) / 255

                    self.init(red: r, green: g, blue: b, alpha: 1)
                    return
                }
                
            } else if hexColor.count == 3 {
                let scanner = Scanner(string: hexColor)
                var hexNumber: UInt64 = 0

                if scanner.scanHexInt64(&hexNumber) {
                    r = CGFloat(((hexNumber & 0xf00) >> 8) + ((hexNumber & 0xf00) >> 4)) / 255
                    g = CGFloat((hexNumber & 0x0f0) + ((hexNumber & 0x0f0) >> 4)) / 255
                    b = CGFloat((hexNumber & 0x00f) + (hexNumber & 0x00f) << 4) / 255
                    
                    self.init(red: r, green: g, blue: b, alpha: 1)
                    return
                }
            }
            
            
            
        }

        return nil
    }
}