UIColor+Hex.swift

import UIKit

extension Int {
    init?(hexString: String) {
        let string = hexString.replacingOccurrences(of: "#", with: "")
        self.init(string, radix: 16)
    }

    var rgb: (red: Int, green: Int, blue: Int) {
        let red = self >> 16 & 0xff
        let green = self >> 8 & 0xff
        let blue = self & 0xff
        return (red, green, blue)
    }
}

extension UIColor {
    convenience init(hex: Int, alpha: CGFloat = 1) {
        let (red, green, blue) = hex.rgb
        self.init(red: red, green: green, blue: blue, alpha: alpha)
    }
    
    convenience init(red: Int, green: Int, blue: Int, alpha: CGFloat = 1) {
        self.init(red: CGFloat(red)/255, green: CGFloat(green)/255, blue: CGFloat(blue)/255, alpha: alpha)
    }    
}

0xffffff.rgb // (255, 255, 255)
0x000000.rgb // (0, 0, 0)

UIColor(hex: 0x0000ff) == .blue // true

Int(hexString: "#E4723D")?.rgb // (red 228, green 114, blue 61)