iOS: My Favorite UIColor Extension Swift 3.0.1

UIColorExension.swift

extension UIColor {
convenience init(rgb: Int, alpha: CGFloat) {
    let r = CGFloat((rgb & 0xFF0000) >> 16)/255
    let g = CGFloat((rgb & 0xFF00) >> 8)/255
    let b = CGFloat(rgb & 0xFF)/255
    self.init(red: r, green: g, blue: b, alpha: alpha)
}

convenience init(red: Int, green: Int, blue: Int) {
    self.init(red: CGFloat(red), green: CGFloat(green), blue: CGFloat(blue), alpha: 1.0)
}

convenience init(netHex: Int) {
    self.init(rgb:netHex, alpha:1.0)
}

convenience init(hex: String) {
    var cString : String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()
    if (cString.hasPrefix("#")){
        let index = cString.index(cString.startIndex, offsetBy: 1)
        cString = cString.substring(from: index)

    }
    let scanner = Scanner(string: cString)
    scanner.scanLocation = 0

    var rgbValue: UInt64 = 0

    scanner.scanHexInt64(&rgbValue)

    let r = (rgbValue & 0xff0000) >> 16
    let g = (rgbValue & 0xff00) >> 8
    let b = rgbValue & 0xff

    self.init(
        red: CGFloat(r) / 0xff,
        green: CGFloat(g) / 0xff,
        blue: CGFloat(b) / 0xff, alpha: 1
    )
 }
}