TIL221025_convertHexToUIColor.md

hex값을 UIcolor로 변환하는 방법

extension UIColor {
    /// Hex값으로 컬러 생성하기
    /// alpha값이 있는경우, alpha값 파라미터를 사용할 것
    /// - Parameters:
    ///   - hex: 16진수
    ///   - alpha: 투명도, (optional)
    convenience init(hex: Int, alpha: CGFloat = 1.0) {
        let components = (
            red: CGFloat((hex >> 16) & 0xff) / 255,
            green: CGFloat((hex >> 08) & 0xff) / 255,
            blue: CGFloat((hex >> 00) & 0xff) / 255
        )
        self.init(red: components.red, green: components.green, blue: components.blue, alpha: alpha)
    }
}

사용예

static let test1Color = UIColor(hex: 0x00D7F1)
static let test2Color = UIColor(hex: 0x00D7F1, alpha: 0.5)

hexString코드를 UIColor로 변환하는 방법

extension UIColor {

    convenience init(hex: String, alpha: CGFloat = 1.0) {
        var hexFormatted: String = hex.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines).uppercased()

        if hexFormatted.hasPrefix("#") {
            hexFormatted = String(hexFormatted.dropFirst())
        }

        assert(hexFormatted.count == 6, "Invalid hex code used.")

        var rgbValue: UInt64 = 0
        Scanner(string: hexFormatted).scanHexInt64(&rgbValue)

        self.init(red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
                  green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
                  blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
                  alpha: alpha)
    }
}

사용예

static let testColor = UIColor(hex: "#000000")
static let test2Color = UIColor(hex: "#000000", alpha: 0.5)