[SWIFT]HexString to UIColor

| 문자열 헥사 코드로 컬러 값 사용하기

extension UIColor {
	convenience init(red: Int, green: Int, blue: Int, alpha: Double = 1.0) {
        self.init(red: CGFloat(red) / 255, green: CGFloat(green) / 255, blue: CGFloat(blue) / 255, alpha: alpha)
    }
    
 	static func hexStringToUIColor (hex:String, alpha: CGFloat = 1.0) -> UIColor {
        var cString:String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()
        
        if (cString.hasPrefix("#")) {
            cString.remove(at: cString.startIndex)
        }
        
        if ((cString.count) != 6) {
            return UIColor.gray
        }
        
        var rgbValue:UInt64 = 0
        Scanner(string: cString).scanHexInt64(&rgbValue)
        
        return UIColor(
            red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
            green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
            blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
            alpha: alpha
        )
    }
}

EX)
let color = UIColor(red: 0, green: 0, blue: 256, alpha: 1.0)
let color = UIColor.hexStringToUIColor(hex: "#ff00ff", alpha: 1.0)