[iOS] UIButton BackgroundColor 설정하기

extension UIButton {
    func setBackgroundColor(_ color: UIColor, for state: UIControl.State) {
        UIGraphicsBeginImageContext(CGSize(width: 1.0, height: 1.0))
        guard let context = UIGraphicsGetCurrentContext() else { return }
        context.setFillColor(color.cgColor)
        context.fill(CGRect(x: 0.0, y: 0.0, width: 1.0, height: 1.0))

        let backgroundImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        setBackgroundImage(backgroundImage, for: state)
    }
}