Create shortcut for RGB color and func that converts HEX to RGB

extension.swift

extension UIColor {
    static func rgb(red: CGFloat, green: CGFloat, blue: CGFloat) -> UIColor {
        return UIColor(red: red/255, green: green/255, blue: blue/255, alpha: 1)
    }
    
    static func mainColor() -> UIColor {
        return UIColor.rgb(red: 105, green: 26, blue: 64)
    }
    
    static func UIColorFromHex(rgbValue:UInt32, alpha:Double=1.0)->UIColor {
        let red = CGFloat((rgbValue & 0xFF0000) >> 16)/256.0
        let green = CGFloat((rgbValue & 0xFF00) >> 8)/256.0
        let blue = CGFloat(rgbValue & 0xFF)/256.0
        
        return UIColor(red:red, green:green, blue:blue, alpha:CGFloat(alpha))
    }
}