[color from hex] #uicolor #extension

UIColorExtension.swift

extension UIColor {
	convenience init(red: Int, green: Int, blue: Int, alpha: CGFloat) {
        assert(red >= 0 && red <= 255, "Invalid red component")
        assert(green >= 0 && green <= 255, "Invalid green component")
        assert(blue >= 0 && blue <= 255, "Invalid blue component")
        self.init(red: CGFloat(red) / 255.0, green: CGFloat(green) / 255.0, blue: CGFloat(blue) / 255.0, alpha: alpha)
    }
    
    convenience init(netHex:Int, alpha: CGFloat = 1.0) {
        self.init(red:(netHex >> 16) & 0xff, green:(netHex >> 8) & 0xff, blue:netHex & 0xff, alpha: alpha)
    }
}