UIColor 实用 extension

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 let twitterBlue = UIColor.rgb(red: 29, green: 161, blue: 242)
    
    
    /**
     十六进制方法
     */
    static func hexColor(_ hexValue : Int, alphaValue: Float ) -> UIColor {
        
        return UIColor(red: CGFloat((hexValue & 0xFF0000) >> 16) / 255,
                       green: CGFloat((hexValue & 0x00FF00) >> 8) / 255,
                       blue: CGFloat(hexValue & 0x0000FF) / 255,
                       alpha: CGFloat(alphaValue))
    }
    
    static func hexColor(_ hexValue : Int) -> UIColor {
        return hexColor(hexValue,alphaValue: 1)
    }
    
    
    convenience init(_ hexValue : Int, alphaValue: Float) {
        self.init(red: CGFloat((hexValue & 0xFF0000) >> 16) / 255,
                  green: CGFloat((hexValue & 0x00FF00) >> 8) / 255,
                  blue: CGFloat(hexValue & 0x0000FF) / 255,
                  alpha: CGFloat(alphaValue))
    }
    
//    convenience init(_ hexValue : Int) {
//        self.init(hexValue,alphaValue:1)
//    }
    
}